JP4828577B2 - Wiring route inspection system - Google Patents

Description

  The present invention mainly relates to a wiring route inspection system for inspecting a route of power supply wiring stretched around a building such as an apartment house.

  In buildings such as apartment houses, watt-hour meters for measuring the amount of power used in each house are often installed in one place. In a building such as an apartment house, if the power supply wiring is mistakenly wired, for example, the watt hour meter measures a value different from the amount of power used, or the watt hour meter The power amount of another residence is measured by mistake, or the power amount of the residence where the watt hour meter is located and the power amount of other residences are measured redundantly. As a result, incorrect billing of the power usage fee occurs.

  For this reason, building contractors and power suppliers, etc., check the route of the power supply wiring stretched around the building so that such incorrect charges do not occur, that is, the power supply wiring to be inspected. Is the power supply wiring that is wired to any residence, and it is checked whether it is wired without error. In this inspection, various methods are used. Recently, in order to simplify the inspection, a method using the following system (hereinafter referred to as “wiring route inspection system”) has been developed. A method using this wiring route inspection system has been tried (for example, see Non-Patent Document 1).

<Details of wiring route inspection system>
The wiring route inspection system disclosed in Non-Patent Document 1 is a measuring instrument connection / wiring inspection device. Hereinafter, “incorrect wiring of power supply wiring example”, “configuration of wiring route inspection system”, “wiring route inspection” Details will be described in the order of “first use example of the system” and “second use example of the wiring route inspection system”.

(Incorrect power supply wiring example)
Hereinafter, an incorrect wiring example of the power supply wiring will be described with reference to FIGS. FIGS. 12A and 12B are diagrams for explaining a connection error. FIG. 12A shows a state in which the power supply wiring Wi is correctly wired with respect to the watt hour meter Wh of each residence, and FIG. 12B shows the state of the watt hour meter Wh of each residence. Thus, the power supply wiring Wi is shown in a wrong state.

  The watt-hour meter Wh is provided with 1S, 2S, and 3S as connection terminals on the power source side, and with 1L, 2L, and 3L as connection terminals on the load side. When there is no connection error, as shown in FIG. 12A, the connection terminals 1S, 2S, and 3S on the power supply side are connected to the power supply wiring Wi that becomes the A line, the C line, and the B line on the power supply side, respectively. In addition, the load side connection terminals 1L, 2L, and 3L are connected to power supply wirings Wi, which are A line, C line, and B line on the load side, respectively. However, when there is a connection error, as shown in FIG. 12B, the connection terminals 1S, 2S, and 3S to be connected to the A-line, C-line, and B-line on the power supply side are respectively connected to the load side. The connection terminals 1L, 2L, and 3L that are connected to the power supply wiring Wi serving as the A line, the C line, and the B line and that are to be connected to the A line, the C line, and the B line on the load side respectively Are connected to the power supply wiring Wi to be the A line, C line, and B line. Here, the case where the electrical system is a 100/200 volt (hereinafter referred to as “V”) type single-phase three-wire system is described as an example. In this power supply method, the voltage between the A line and the B line is 200 V, the voltage between the A line and the C line is 100 V, and the voltage between the B line and the C line is The voltage is 100V.

  As shown in FIG. 12B, when there is a connection error, the watt-hour meter Wh measures a value different from the used power amount.

  FIG. 13 is a diagram for explaining a wiring error. FIG. 13 shows that the watt-hour meter Wh101 for room 101, the watt-hour meter Wh102 for room 102, and the watt-hour meter Wh103 for room 103 are installed in one collector. Wh102 and watt-hour meter Wh103 are mistakenly wired, that is, watt-hour meter Wh102 for Room 102 is connected to power supply wiring Wi for Room 103 and watt-hour meter Wh103 for Room 103 is for Room 102 A state of being connected to the power supply wiring Wi is shown.

  As shown in FIG. 13, when there is a wiring error, the watt hour meter Wh measures the power amount of the house corresponding to the power amount of the other house by mistakenly measuring it.

(Configuration of wiring route inspection system)
In order to find such an incorrect wiring, a construction worker of a building such as an apartment house or a power supplier uses, for example, the following wiring route inspection system.

  Hereinafter, the configuration of the wiring route inspection system will be described with reference to FIGS. 14A and 14B, FIGS. 15, 16, 17 </ b> A and 17 </ b> B, and FIG. 18. FIGS. 14A and 14B are diagrams each showing a configuration of a wiring route inspection system. FIG. 14A shows the external configuration of the transmitter used for the wiring path inspection system, and FIG. 14B shows the external configuration of the receiver used for the wiring path inspection system.

  As is well known, the transmitter 10 shown in FIG. 14A includes a power switch 12 that is selected by the operator to turn on or off the power, an input key 14 for inputting an arbitrary code by the operator, and information. A display 16 for display and a plug PL that is electrically connected to the power supply wiring Wi by being inserted into an outlet serving as a terminal end of the power supply wiring Wi are provided. The transmitter 10 includes a dummy load inside. The dummy load is electrically connected to the power supply wiring Wi through a switch such as a triac and a plug PL. The plug PL is electrically connected to the power supply wiring Wi via the voltage terminal clips cl1 and cl2 of the cable CB by being inserted into the socket SC of the cable CB including the socket SC and the voltage terminal clips cl1 and cl2. You can also

In the transmitter 10, an arbitrary code (for example, a room number) including a plurality of character strings is input from the input key 14 by the operator while being electrically connected to the power supply wiring Wi. In this case, transmitter 10, by switching the internal switch intermittently at the switching pattern corresponding to the character in synchronization with the commercial frequency of 50Hz or 60 Hz, encodes the dummy load current flowing through the dummy load, thereby The code corresponding to each character of the code input by the operator is encoded and output to the power supply wiring Wi as a signal used for inspection (hereinafter referred to as “inspection signal”). This check signal is generated as a current signal of a number of bit sections corresponding to characters, with one cycle of the power supply frequency as one bit section. Therefore, the 1-bit section corresponds to the waveform of one cycle of the current of the inspection signal. 15 and 16 show an example of the current waveform of the inspection signal. FIG. 15 shows an example of the current waveform pattern of the inspection signal representing one character (here, the character “7”). This check signal is a combination of a character bit section represented by a start bit (S) section of a 1-bit section and a binary number of an 8-bit section, assuming that one period is a 1-bit section. It consists of. FIG. 16 shows an example of a current waveform pattern of an inspection signal representing a 5-digit code “77777” in which each digit of a character string of one code is a character “7”. CH1 shown in FIG. 16 indicates the current waveform pattern of the inspection signal “77777”, and CH2 shown in FIG. 16 indicates the determination timing of the presence / absence of bits of the inspection signal. Note that CH1 and CH2 below the arrow shown in FIG. 16 show waveforms that are enlarged and normalized by one character of CH1 and CH2 above the arrow.

  As is well known, the receiver 60 shown in FIG. 14B has a power switch 62 that is selected to be turned on or off by the operator, an input key 64 that is operated by the operator, and a display 66 that displays information. And current transformers CT1 and CT3 and voltage terminal clips CL1, CL2, and CL3 as connection terminals that are electrically connected to the power supply wiring Wi. The current transformers CT1 and CT3 convert a large current into a small current (for example, 100 amperes into 5 amperes), and measure the current flowing through the power supply wiring Wi. In addition, the structure of current transformer CT1 and CT3 is shown to FIG. 17 (A) and (B) and FIG. As shown in FIGS. 17A and 17B, the current transformers CT1 and CT3 include a push button CTp and a clamp CTc. As is well known, the clamp CTc is formed of a conductor having a certain magnetic permeability, and is opened by the operator pressing the push button CTp as shown in FIG. 17A. As shown, the operator releases the push button CTp to close it. The operator closes the clamp CTc while passing the power supply wiring Wi through the clamp CTc. In this way, the current transformers CT1 and CT3 are respectively connected to the A line and the B line of the power supply wiring Wi connected to the power supply side of the watt hour meter Wh. As shown in FIG. 18, the clamp CTc is wound with a wire wi. When a current I1 flows through the power supply wiring Wi passed through the clamp CTc, a voltage E0 is generated at both ends of the wire wi, and the wire wi A current I2 flows. Further, the voltage terminal clips CL1, CL2, and CL3 are respectively connected to the A line, the B line, and the C line of the power supply wiring Wi that is connected to the load side of the watt hour meter Wh. Note that the operator of the transmitter 10 and the operator of the receiver 60 may be the same person or different persons. Here, it is assumed that the operator of the transmitter 10 and the operator of the receiver 60 are the same person.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state. The receiver 60 receives the inspection signal output from the transmitter 10 via the power supply wiring Wi. At this time, based on the current waveform pattern of the inspection signal, the receiver 60 converts the inspection signal into a corresponding code (that is, an arbitrary character string composed of a plurality of character strings input from the input key 14 of the transmitter 10 by the operator). Code (for example, room number)) and displayed on the display 66.

  Such a wiring route inspection system using the transmitter 10 and the receiver 60 transmits an inspection signal including an arbitrary code such as a room number transmitted by the transmitter 10 via a power supply wiring Wi laid around the building. The receiver 60 is made to acquire. At this time, if there is no error in the path of the power supply wiring Wi, the receiver 60 can display the same code as the code output from the transmitter 10 on the display 66. However, if there is an error in the path of the power supply wiring Wi, the receiver 60 displays a code different from the code output from the transmitter 10 on the display 66. Thereby, the wiring route inspection system can detect the presence or absence of incorrect wiring.

(First use example of wiring route inspection system)
Hereinafter, a first use example of the wiring route inspection system disclosed in Non-Patent Document 1 will be described with reference to FIGS. FIGS. 19A and 19B are diagrams showing examples of use when determining the presence or absence of a connection error, respectively. FIG. 19A shows an example when the connection is correct, that is, when there is no connection error, and FIG. 19B shows an example when the connection is incorrect, that is, when there is a connection error.

  When determining the presence or absence of a connection error using the wiring path inspection system, the operator takes the receiver 60 and the transmitter 10 and goes to the place where the watt hour meter Wh is installed. In addition, when the building is a collective housing, the watt hour meter Wh of each residence is often installed in one collector.

  The operator connects the current transformers CT1 and CT3 of the receiver 60 to the A line and the B line of the power supply wiring Wi on the power supply side, respectively, and the voltage terminal clips CL1, CL2, and CL3 to the power supply wiring on the load side, respectively. By connecting to the A line, B line, and C line of Wi, the receiver 60 is connected to the power supply wiring Wi connected to the watt hour meter Wh.

  Next, the operator inserts the plug PL of the transmitter 10 into the socket SC of the cable CB, and then connects the voltage terminal clips cl1 and cl2 of the cable CB to the A line and C line of the power supply wiring Wi on the load side, respectively. Thus, the transmitter 10 is connected to the power supply wiring Wi connected to the load side of the watt hour meter Wh.

  When the operator connects the voltage terminal clips cl1 and cl2 of the cable CB to the A line and the C line of the load-side power supply wiring Wi, respectively, an arbitrary code (for example, a plurality of character strings) is input from the input key 14 of the transmitter 10. Enter the room number). When a code is input by the operator, the transmitter 10 generates an inspection signal in response to the code as described above. The transmitter 10 sequentially outputs the generated inspection signal one character at a time to the A line and the C line of the power supply wiring Wi on the load side via the voltage terminal clips cl1 and cl2 of the cable CB.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state. The receiver 60 receives the inspection signal output from the transmitter 10 via the power supply wiring Wi. The receiver 60 converts the inspection signal into a corresponding code on the display 66 based on the current waveform pattern of the inspection signal.

  As shown in FIG. 19A, when the connection is correct, that is, when there is no connection error, the receiver 60 displays the same code as the code transmitted by the transmitter 10 on the display 66.

  On the other hand, as shown in FIG. 19B, when the connection is incorrect, that is, when there is a connection error, the receiver 60 cannot receive the code transmitted by the transmitter 10. Therefore, nothing is displayed on the display 66.

  Therefore, the operator can determine whether or not there is a connection error by checking whether or not the code transmitted by the transmitter 10 matches the code displayed on the display 66 of the receiver 60. That is, the operator can determine that there is no error in the connection when they match, and can determine that there is an error in the connection in other cases, that is, when they do not match or do not receive.

(Second usage example of wiring route inspection system)
Hereinafter, a second usage example of the wiring path inspection system disclosed in Non-Patent Document 1 will be described with reference to FIGS. FIG. 20 and FIG. 21 are diagrams showing examples of use when determining the presence or absence of a wiring error. FIG. 20 shows an outline of the connection between the transmitter 10 and the power supply wiring Wi and the connection between the receiver 60 and the power supply wiring Wi. FIG. 21 shows the connection between the transmitter 10 and the power supply wiring Wi and the receiver 60. And details of the connection between the power supply wiring Wi.

  When determining the presence or absence of a wiring error using the wiring route inspection system, first, the operator goes to the place where the watt hour meter Wh is installed with the receiver 60. In the following description, it is assumed that the building is a collective housing and the watt-hour meter Wh of each residence is installed in one collector.

  The operator connects the current transformers CT1 and CT3 of the receiver 60 to the A line and the B line of the power supply wiring Wi on the power supply side, respectively, and the voltage terminal clips CL1, CL2, and CL3 to the power supply wiring on the load side, respectively. By connecting to the A line, the B line, and the C line of Wi, the receiver 60 is connected to the power supply wiring Wi connected to the watt hour meter Wh corresponding to the residence to be inspected. The receiver 60 connected to the power supply wiring Wi is in a reception waiting state.

  Next, the operator takes the transmitter 10 and goes to the place where the outlet CN is installed in the residence to be inspected. Then, the operator inserts the plug PL of the transmitter 10 into the outlet CN, thereby connecting the transmitter 10 to the power supply wiring Wi stretched around the building. The outlet CN is connected to the load side terminal 1L of the power system Wh by the power supply wiring Wi through the distribution board B in which the main circuit breaker and the branch wiring circuit breaker are collectively arranged at one place. It is connected to 2L and 3L.

  As a result, as shown in FIGS. 20 and 21, the transmitter 10 is electrically connected to the power supply wiring Wi through the plug PL and the outlet CN, and the receiver 60 includes the current transformers CT1 and CT3. Is connected to the A line and the B line of the power source wiring Wi on the power source side of the watt hour meter Wh, and the power side wiring Wi on the load side of the watt hour meter Wh via the voltage terminal clips CL1, CL2, and CL3. Connected to A line, B line, and C line.

  Next, the operator inputs an arbitrary code (for example, a room number) composed of a plurality of character strings from the input key 14 of the transmitter 10. When the code is input by the operator, the transmitter 10 generates the inspection signal in response to the code as described above, and the generated inspection signal is transmitted to the voltage terminal clips cl1 and cl2 of the cable CB. And sequentially output one character at a time to the A line and C line of the power supply wiring Wi on the load side.

  When there is no wiring error, the watt-hour meter Wh is correctly connected to the corresponding residence. When the receiver 60 receives the inspection signal output from the transmitter 10 via the power supply wiring Wi, the receiver 60 converts the inspection signal into a corresponding code based on the current waveform pattern of the inspection signal, and the transmitter 10 outputs it. The same code as the selected code is displayed on the display 66.

  On the other hand, when there is a wiring error, the watt-hour meter Wh is connected to a residence different from the corresponding residence, or is connected to a plurality of residences. In this case, the receiver 60 displays a code different from the code output from the transmitter 10 on the display 66 or displays the code output from the plurality of transmitters 10 on the display 66 in an overlapping manner. Accordingly, the operator can select the room in which the transmitter 60 outputs the code based on the code (for example, the room number) displayed on the display 66 of the receiver 10 and the power supply wiring Wi from which the receiver 10 has acquired the code. The correspondence relationship can be grasped.

  Therefore, the operator can easily specify the route of the power supply wiring by checking whether or not the code transmitted from the transmitter 10 matches the code displayed on the display 66 of the receiver 60. The presence or absence of wiring errors can be determined.

As described above, a construction contractor of a building such as an apartment house or a power supplier checks the route of the power supply wiring.
Tomoyuki Ishizaki and Michio Shido “Development of instrument connection and wiring inspection device” (Research Annual Report Vol. 38), Hokkaido Electric Power Co., Ltd., published on October 22, 2007 (Hokkaido Electric Power Co., Ltd. website http: // (See www.hepco.co.jp/corporate/souken/annual_repo/annual_repo.html)

  The wiring route inspection system disclosed in Non-Patent Document 1 (hereinafter referred to as “conventional wiring route inspection system”) is the inspection output from the transmitter if the general load current does not flow in the power supply wiring. The signal can be easily detected by the receiver. The “general load current” means a current that flows when a general load, that is, a load such as an electric product installed in each residence is applied.

  However, the receiver of the conventional wiring path inspection system cannot distinguish between the general load current and the inspection signal current. Therefore, in the conventional wiring path inspection system, when a general load current flows through the power supply wiring, it is difficult to detect the current of the inspection signal output from the transmitter with the receiver.

  Therefore, in the conventional wiring route inspection system, when a general load current flows through the power supply wiring, there is a wiring error between each watt hour meter in a building such as an apartment house and a residence corresponding to each watt hour meter. There was a problem that there were times when we could not check.

  The object of the present invention is to determine whether or not there is a wiring error between each watt hour meter in a building such as an apartment house and a dwelling corresponding to each watt hour meter even when a general load current flows through the power supply wiring. The receiver can easily and accurately distinguish the current section consisting only of the components of the general load current and the composite current section consisting of both the components of the general load current and the signal current so that it can always be checked. An object of the present invention is to provide a wiring route inspection system that can be used.

In order to solve the above-mentioned problem, the transmitter of the wiring route inspection system according to the present invention is:
(1) An input unit that can input an arbitrary code represented by M digits (where M is an integer);
(2) An inspection signal generation unit having the following configuration is provided.

That is, the inspection signal generation unit is an inspection signal composed of character signals of M characters that are output to the power supply wiring in response to the input of the code,
The character signal is
(A) Each bit section is composed of N bits (where N is an integer) allocated to a section of one period of the commercial frequency,
(B) In the N bit section, the current waveform pattern of each current is obtained by sequentially flowing one cycle into each of Q bit sections (where Q is an integer) smaller than N corresponding to the character. It is formed as a signal current including Q unit currents to be generated.
The inspection signal is generated.

Moreover, the receiver of the wiring route inspection system according to the present invention is:
(1) a display for displaying necessary information including a code;
(2) An inspection signal detection unit having the following configuration is provided.

That is, when the inspection signal detection unit is connected to the power supply wiring through which the general load current flows,
(A) The current flowing through the power supply wiring is detected as a detection current,
(B) For the detected current detected,
(I) The current value of the detected current is compared with (ii) a threshold value determined to determine whether the detected current is a combined current of the general load current and the unit current, and the waveform pattern of the unit current Detect
(C) From the appearance patterns of the Q waveform patterns detected sequentially, the operation of specifying the character signal of the character corresponding to the appearance pattern is performed until the specification of the character signal of the M characters is completed, and the inspection signal Detect
(D) (i) obtaining a code of M-digit characters from the inspection signal, and (ii) displaying the obtained code on a display, and (e) a general load current every time a waveform pattern of unit current is detected. In order to avoid the occurrence of a waveform pattern detection failure due to the fluctuation of the current value, the threshold value is changed to a new threshold value based on the current value of the detected current detected.

In addition, this wiring route inspection system is preferably
(1) The inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and (2) the inspection signal detection section
(A) The threshold value is changed with reference to the current value of the detected current in the separated section, and (b) the waveform pattern of the unit current of the next character is detected in the bit section of the next character following the separated section. A configuration may be adopted in which the current value of the detected current is compared with a new threshold value.

Moreover, this wiring route inspection system is preferably
(1) The character is composed of any one of the numbers “0-9”,
(2) When the signal current is represented by a binary code, an N-bit section is represented by a predetermined number of start bits that represent the head of the signal current and whose binary value is “1”, and the start bit section. Consists of a separation bit section having a binary value of “0” consisting of bit sections, and a numeric bit section representing a bit string corresponding to one of the above-mentioned numbers of 6-bit sections following the separation bit section It should be.

  In such a configuration, more preferably, the N bit section is further used in a preliminary manner according to the operation of a predetermined number of bit sections between the start bit section and the separation bit section. A configuration including a spare bit section is preferable.

  In such a configuration, more preferably, the N bit section is divided into a start bit section of the first bit, one spare bit section of the second bit, and one separation of the third bit. A 9-bit section composed of a bit section and numeric bit sections of the fourth to ninth bits may be used.

  In this wiring route inspection system, it is preferable that the inspection signal generator generates an “uninputted” character when the number of characters constituting the M-digit characters of the code is less than a predetermined number of M characters. It is preferable to form and output the character signals associated with the symbol meaning "" for the number of missing characters.

  In this wiring route inspection system, preferably, the inspection signal generation unit has a storage unit that stores the number of acquisitions of the code and the acquired code in association with each other, and the number of acquisitions read from the storage unit And a code associated therewith may be displayed on the display.

  According to this wiring path inspection system, the inspection signal detector of the receiver changes the threshold value to a new threshold value based on the current value of the detected current. As a result, even when the general load current is flowing in the power supply wiring, the receiver can receive the section of the current composed only of the components of the general load current and the combined current composed of the components of both the general load current and the signal current. A section can be easily and accurately divided. Therefore, this wiring route inspection system can improve the reception accuracy of the inspection signal, and the current of the inspection signal output from the transmitter can be easily detected by the receiver. As a result, according to this wiring route inspection system, even when general load current is flowing in the power supply wiring, each watt hour meter in a building such as an apartment house and the dwelling corresponding to each watt hour meter It is possible to obtain an effect that it is possible to check whether there is a wiring error between the two.

  In this wiring route inspection system, (1) the inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and ( 2) The inspection signal detection unit (a) changes the threshold value based on the current value of the detected current in the separated section, and (b) detects the waveform pattern of the unit current of the next character in the separated section. The receiver is changed to a value suitable for the detection of the waveform pattern of the unit current of the next character by configuring the current value of the detected current in the bit section of the next character to be compared with the new threshold value. The waveform pattern of the unit current of the next character is detected using the threshold value. Therefore, this wiring path inspection system can further improve the reception accuracy of the inspection signal. As a result, according to this wiring route inspection system, it is possible to constantly and stably check whether there is a wiring error between each watt-hour meter in a building such as an apartment house and a residence corresponding to each watt-hour meter. The effect of being able to be obtained can be obtained.

  Note that the inspection signal generation unit of the transmitter is configured by (1) any one of the numbers “0 to 9”, and (2) N 2 when the signal current is represented by a binary code. A bit section represents a start bit of a signal current and a binary value of “1” and a separation bit having a binary value of “0” consisting of a predetermined number of bit sections following the start bit section By configuring a section and a numeric bit section representing a bit string corresponding to any of the above-described numbers of a 6-bit section following the separated bit section, the receiver performs conversion based on the detected current. When the code is a code other than the numbers “0 to 9”, it can be determined that the detected current is not an inspection signal. Therefore, according to this wiring path inspection system, the reception accuracy of the inspection signal can be increased also by this.

  Further, the N bit section further includes a spare bit section of a predetermined number of bits, which is used preliminarily according to operation, between the start bit section and the separation bit section. According to the route inspection system, a preliminary code other than the numbers “0 to 9” can be used. However, the preliminary code must always include a separation bit interval. As such a preliminary code, for example, a code representing the middle point “•” in which the value of the second bit section following the start bit section is “0” can be used.

  The N bit section includes a start bit section of the first bit, one spare bit section of the second bit, one separation bit section of the third bit, and numbers of the fourth to ninth bits. By adopting a 9-bit section composed of bit sections, the receiver can detect the detection current when the code converted based on the detection current is a code other than the numbers “0 to 9” and the preliminary code. Can be determined not to be an inspection signal. Therefore, according to this wiring path inspection system, the reception accuracy of the inspection signal can be increased also by this.

  In addition, the inspection signal generator corresponds to a symbol that means that the missing character is “not input” when the number of characters constituting the M-digit character of the code is less than the predetermined number of M characters. The transmitter outputs a code with a predetermined number of digits including a character meaning “not input” to the receiver by forming the attached character signal for the number of missing characters and outputting it. Can do. Thereby, according to this wiring route inspection system, a code having a predetermined number of digits can be correctly transmitted from the transmitter to the receiver.

  In addition, the inspection signal generation unit has a storage unit that stores the code acquisition count and the acquired code in association with each other, and the acquisition count read from the storage unit and the code associated therewith With the configuration of displaying on the display, the operator can check the number of acquisitions displayed on the display and the code associated with each acquisition number while comparing them. At this time, if the receiver displays a code output from a room different from the room to be inspected on the display, the power supply wiring is mistakenly wired. At this time, if the receiver displays the code output from the room to be inspected together with the display and the code output from a room different from the room to be inspected on the display, the power supply wiring is duplicated. Will be. Therefore, according to this wiring route inspection system, it is possible to easily detect a mistaken power supply wiring or an overlapping power supply wiring.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, each figure has only shown each component roughly to such an extent that this invention can be understood. Therefore, the present invention is not limited to the illustrated example. Moreover, in each figure, the same code | symbol is attached | subjected about the common component and the same component, and those overlapping description is abbreviate | omitted. The numerical conditions described below are merely examples.

<Details of Wiring Route Inspection System of Embodiment>
"System configuration", "System power supply wiring installation and inspection overview", "Inspection signal details", "Synthetic current details", "System operation", and "System usage examples" The details of the wiring route inspection system of the embodiment will be described in the order of.

(System configuration)
The configuration of the wiring route inspection system according to the embodiment will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of the system according to the embodiment.

  This system includes a transmitter 10 and a receiver 60.

  In addition to the main components of an input unit 14 such as a numeric keypad and an inspection signal generation unit 20 that outputs an inspection signal, the transmitter 10 is powered by the operator. A power switch 12 that is selected to be turned on or off, a display 16 that displays required information, and a plug PL that is electrically connected to the power supply wiring Wi by being inserted into an outlet that is the end of the power supply wiring Wi. I have. The transmitter 10 receives the current input from the commercial power source E by being connected to the load-side power wiring Wi of the watt-hour meter Wh by inserting the plug PL into any outlet CN installed in each residence. By using this, an inspection signal can be sent to the power supply wiring Wi. The transmitter 10 further includes a DC power supply unit 26 that supplies power to each unit of the transmitter 10.

  The inspection signal generation unit 20 includes a calculation unit 22 that executes various calculations, a storage unit 24 that stores various data, a dummy load that artificially applies a load to the power supply wiring Wi connected via the plug PL and the outlet CN. R, constituted by a triac or the like that intermittently cuts off the connection between the plug PL and the dummy load R to flow or cut off the commercial frequency current from the commercial power source (for example, 100V AC power source) E Switch SW and the like. This disconnection control of the switch SW will be described in the section “Evaluation of Inspection Signal” described later.

  The calculation unit 22 is configured by a CPU, and by reading a required program, it internally controls the operation of the main control unit 22a that controls the operation of each unit and the operation of the switch SW to generate an inspection signal as an analog signal. Functional means such as a switch circuit control unit 22b and a display control unit 22c for controlling the operation of the display are constructed. The storage unit 24 includes a reference data storage unit 24a for storing various data referred to when generating the inspection signal, an operation data storage unit 24b for storing data such as an operation history of the transmitter 10, and an operator using an input key 14, a storage area such as an input code storage unit 24c for storing a code (for example, a room number) input to the transmitter 10 is secured. The calculation unit 22 and the storage unit 24 operate with a digital signal, as is well known.

  The operation history of the transmitter 10 stored in the operation data storage unit 24b and the information such as the code stored in the input code storage unit 24c check, for example, whether or not the transmitter 10 is operating normally. This is utilized when the code output by the transmitter 10 and the code detected by the receiver 60 are compared and verified. For example, in the transmitter 10, when the operator operates the input key 14, in response to this, the display control unit 22 c reads the operation history of the transmitter 10 from the operation data storage unit 24 b or stores the input code. The code output in the past by the transmitter 10 is read from the unit 24 c and displayed on the display 16.

  On the other hand, the receiver 60 includes a power switch 62 that is selected to be turned on or off by an operator, an input unit 64 for inputting an arbitrary code or instruction by the operator, for example, an input key 64 such as a numeric keypad, and necessary information. , A current transformer CT1 and CT3 as connection terminals electrically connected to the power supply wiring Wi, and voltage terminal clips CL1, CL2, and CL3. In the receiver 60, CT1 and CT3 are connected to the A line and B line of the power supply wiring Wi on the power supply side of the watt hour meter Wh, respectively, and the voltage terminal clips CL1, CL2, and CL3 are respectively connected to the load side of the watt hour meter Wh. Connected to connection terminals 1L, 2L, and 3L. In addition to the single-phase three-wire system, there are a single-phase two-wire system, a three-phase three-wire system, and the like. Two voltage terminal clips CL are required if the power supply system is a single-phase two-wire system, and three voltage terminal clips CL are required if the power supply system is a single-phase three-wire system or a three-phase three-wire system.

  The receiver 60 detects a current flowing through the power supply wiring Wi as an analog detection current, and detects an inspection signal from the detected current, and a DC power supply that supplies power to each part of the receiver 60 Unit 76 and an input / output unit 78 for inputting / outputting data to / from an external computer. The inspection signal detection unit 70 is a receiver through a calculation unit 72 that executes various calculations, a storage unit 74 that stores various data, current transformers CT1 and CT3, and voltage terminal clips CL1, CL2, and CL3. 60 includes a transformer TE that transforms the current of the commercial voltage input to 60 to an arbitrary voltage. The calculation unit 72 is constituted by a CPU, and by reading a required program, it internally determines the main control unit 72a that controls the operation of each unit, determines whether the detected current detected is an inspection signal, and performs an inspection. In the case of a signal, functional means such as a determination unit 72b that converts the code represented by the inspection signal and a display control unit 72c that controls the operation of the display are constructed. The storage unit 74 stores a reference data storage unit 74a that stores various types of data that are referred to when the inspection signal is detected from the detection current input from the power supply wiring Wi to the receiver 60 and when the inspection signal is converted into a code represented by the inspection signal. , An operation data storage unit 74b for storing data such as an operation history of the receiver 60, an instruction input to the receiver 60 by the operator operating the input key 64 (for example, a code received at an arbitrary number of receptions) A storage area such as a detection code storage section 74c for storing the display of the Naturally, since the calculation unit 72 and the storage unit 74 operate with digital signals, the analog signal converted by the transformer unit TE is A / D converted and input to the calculation unit 72 and the storage unit 74.

(Outline of installation and inspection of system wiring)
Hereinafter, with reference to FIG. 2, an outline of installation and inspection of the system power supply wiring according to the embodiment will be described. FIG. 2 is an explanatory diagram of attachment of the system of the embodiment to the power supply wiring.

  When the plug PL is inserted into the building outlet CN by the operator, the transmitter 10 is in a state of being electrically connected to the power supply wiring Wi laid around the building as shown in FIG.

In this connection state, the inspection signal generation unit 20 (see FIG. 1) of the transmitter 10 allows the operator to select an arbitrary code (M is an integer) from the input key 14 (ie, M is an integer). For example, when a room number) is input, a signal current is generated as an inspection signal indicating a code input by the operator and is output to the power supply wiring Wi. The inspection signal is composed of a series of character signals each representing each character of M digits. Each character signal is made up of N bits (where N is an integer). Each bit section of N-bit interval is allocated between one period of Ku commercial frequency for example 50Hz or 60 Hz. A unit current is sequentially applied to each of Q bit sections (where Q is an integer) smaller than N in the N bit section. The combination of the bit positions of Q bits through which the unit current flows is different for each character, and the combination of the character and the position of the bit section has a one-to-one relationship. The unit current is a sine wave current of commercial frequency, and the unit current flowing in each bit section has the same amplitude and waveform. Therefore, the character signal described above is a signal current including a series of unit currents flowing in Q bit sections, and the appearance pattern of the current waveform of each unit current that sequentially flows in each bit is different for each character. Details of the inspection signal will be described in detail in the section “Details of Inspection Signal”.

  The inspection signal, that is, the signal current output to the power supply wiring Wi is combined with the general load current flowing through the power supply wiring Wi. Hereinafter, the current obtained by combining the signal current and the general load current is referred to as “combined current”. Details of the composite current will be described in detail in the section “Details of Composite Current”.

  On the other hand, the receiver 60 has connection terminals (specifically, current transformers CT1 and CT3 and voltage terminal clips CL1, CL2, and CL3) that are connected by the operator to the power supply wiring Wi on the power supply side of the watt hour meter Wh and the load side. Are electrically connected to the power supply wiring Wi.

  The receiver 60 connected to the power supply wiring Wi is in a reception waiting state for detecting the inspection signal, and a detection current obtained by detecting the current flowing through the power supply wiring Wi is input through the connection terminal. The The detected current input from the power supply wiring Wi to the receiver 60 may be a current obtained by superimposing both components of the general load current and the signal current as the inspection signal. In some cases, the current is composed only of the components of the general load current that does not include the components. In the following description, for convenience of explanation, the current in either state input from the power supply wiring Wi to the receiver 60 is also referred to as “detected current”.

When the detected current is A / D converted and input from the power supply wiring Wi, the inspection signal detection unit 70 (see FIG. 1) of the receiver 60 responds to the current value of the detected current (a “wave” described later). High price ") is detected. Both inspection signal detector 70, the detected current, for each one period of the power frequency set in the so-called commercial frequency 50Hz or 60 Hz, the detected current and the current value of the detected current common load current and the signal current Compared with a predetermined threshold value (described later “upper limit threshold value”) to determine whether or not the combined current is composed of the components of the detected current, it is composed of both the general load current and the signal current. The synthesized current section and the section consisting only of the general load current component not including the inspection signal component are separated. Thereby, the inspection signal detection part 70 detects the waveform pattern of the unit current, when the part of the signal current which flows through the section for every period , ie, the unit current, exists. Hereinafter, the operation of detecting the waveform pattern of the unit current for each cycle by the inspection signal detection unit 70 is referred to as “unit current detection”. Zone one rotation period of the unit current is detected, a segment combined current described above flows, also, the section of one period of the unit current is not detected, consisting only of components of the common load current It is determined as a section.

When the detected waveform pattern of the unit current for each period section reaches one character, the inspection signal detection unit 70 responds to the occurrence of the character corresponding to the appearance pattern of the waveform pattern of the unit current for one character. Convert to character signal. The inspection signal detection unit 70 performs the conversion operation to the character signal until the converted character reaches the number of characters input by the operator and detects it as an inspection signal. As a result, the inspection signal detection unit 70 acquires the M-digit character code input from the input key 14 of the transmitter 10 by the operator from the detected inspection signal. Then, the inspection signal detection unit 70 displays the acquired code on the display 66.

  The operator confirms a code (for example, a room number) displayed on the display 66 of the receiver 60, so that which power wiring Wi around the watt hour meter Wh is the power wiring Wi wired to which residence. Can be checked.

In the embodiment, the inspection signal detection unit 70 changes the threshold value to a new threshold value based on the current value of the detected current. And the inspection signal detection part 70 compares the electric current value of a detected electric current with the threshold value changed into the new value with respect to the detected electric current detected after the change of a threshold value. Thereby, the receiver 60 has improved the detection accuracy of the waveform pattern of the unit current for each period section, that is, the detection accuracy of the inspection signal, as compared with the conventional case. This point will be described in detail in the chapter “System Operation”.

(Details of inspection signal)
The details of the inspection signal will be described below with reference to FIG. 3 and FIGS. 4 (A) and 4 (B). FIG. 3 is a diagram illustrating an example of an inspection signal. FIGS. 4A and 4B are diagrams showing correspondence between characters and appearance patterns of unit current waveforms, respectively.

  The inspection signal is a current generated when the internal circuit of the transmitter 10 is turned on or off. The inspection signal represents a combination pattern of an energized state and a non-energized state in the internal circuit of the transmitter 10.

For example, in the electric circuit shown in FIG. 2, the transmitter 10 includes a switch SW configured by a triac or the like. This switch SW is connected to a dummy load R and an AC voltage power supply of 100 volts (corresponding to the power supply E in FIG. 1). The switch SW opens and closes according to the control of the switch circuit control unit 22b (see FIG. 1). Then, the switch circuit control unit 22b synchronizes with the commercial frequency of 50 Hz or 60 Hz, that is, the power supply frequency, that is, synchronizes when the sine wave of the general load current passes through the zero point, and outputs the analog signal serving as the switching signal. The switch SW is sent to open and close the switch SW. At this time, the current flowing through the dummy load R is intermittently disconnected. As a result, an intermittent current is generated in units of one cycle of the power supply frequency. Note that the opening / closing pattern of the switch SW is determined in advance corresponding to the characters so that the same characters are the same and the different characters are different. Therefore, the intermittent current appears in a waveform pattern corresponding to the M-digit character representing the code. The intermittent current that appears in the waveform pattern corresponding to the M-digit character is the inspection signal (see FIG. 3). Therefore, the inspection signal is a signal current including a series of unit currents generated in a bit section defined for each character, that is, one period of the power supply frequency.

  In this embodiment, the open / close pattern of the switch SW matches the configuration pattern of the signal current of the character signal corresponding to the eleven types of characters described with reference to Table 1 and FIG. The configuration pattern of the signal current of the character signal corresponding to these 11 types of characters, that is, the switch SW open / close pattern, is stored in the reference data storage unit 24a of the storage unit 24, and the switch circuit control unit 22b switches the switch SW. Referenced when opening and closing. Hereinafter, the configuration pattern of the signal current of the character signal corresponding to 11 types of characters, that is, the open / close pattern of the switch SW is referred to as a “reference configuration pattern”. When the switch circuit control unit 22b opens and closes the switch SW, the switch circuit control unit 22b reads each reference configuration pattern from the reference data storage unit 24a, and sends a switching signal to the switch SW based on each read reference configuration pattern. Open and close.

  FIG. 3 shows an example of a check signal representing a 5-digit code “77777” in which each digit is the character “7”. CH1 shown in FIG. 3 represents the current waveform of the inspection signal, and CH2 shown in FIG. 3 represents timing for measuring the unit current of the inspection signal. Note that CH1 and CH2 below the arrow shown in FIG. 3 indicate waveforms that are further normalized by expanding CH1 and CH2 above the arrow.

In the embodiment, the types of characters to be handled are limited to 11 types of numbers “0 to 9” and midpoint “·”. These 11 types of characters can be expressed as 8-bit signals when the signal current corresponding to the section of 8 cycles is displayed in binary code. In this case, the character signal is 9 bits with N = 9, for example. In this case, the configuration pattern shown in Table 1 below is obtained.

  Table 1 shows the bit structure of the binary value (bit value) of the character signal for each character when the signal current is represented by a binary code. It should be noted that the bit value “1” in Table 1 indicates the “current amplitude” state of the unit current, and the bit value “0” indicates the “no amplitude” state of the unit current. FIG. 4A shows the appearance pattern of the waveform pattern of unit current corresponding to the 11 types of characters in Table 1. For these eleven types of characters, in the character “0”, Q is 3, and a unit current flows in the first, fourth, and fifth bits. In the character “1”, Q is 4, and a unit current flows in the first, fourth, fifth and ninth bits. In the character “2”, Q is 4, and a unit current flows in the first, fourth, fifth and eighth bits. In the character “3”, Q is 5, and a unit current flows in the first, fourth, fifth, eighth and ninth bits. In the character “4”, Q is 4, and a unit current flows in the first, fourth, fifth and seventh bits. In the character “5”, Q is 5, and a unit current flows in the first, fourth, fifth, seventh and ninth bits. In the character “6”, Q is 5, and a unit current flows in the first, fourth, fifth, seventh and eighth bits. In the character “7”, Q is 6, and the unit current flows in the first, fourth, fifth, seventh, eighth and ninth bits. In the character “8”, Q is 4, and a unit current flows in the first, fourth, fifth and sixth bits. In the character “9”, Q is 5, and a unit current flows in the first, fourth, fifth, sixth and ninth bits. In the symbol “•”, Q is 5, and a unit current flows in the first, second, fourth, seventh and ninth bits. The signal currents constituting the character signals of these 11 types of characters are represented by binary codes, and the first bit is a start bit representing the head of the signal current, and the second to ninth bits are characters representing characters. It becomes a bit (see Table 1 and FIG. 4B). Of the 2nd to 9th bits, the 4th to 9th bits are bits representing the numbers “0 to 9”. Therefore, hereinafter, the fourth to ninth bits are referred to as “numeric bits”. The second bit is a bit that is used in a preliminary manner according to the operation, as in the case where the middle point “·” is represented. Therefore, hereinafter, the second bit is referred to as “reserved bit”. Further, since the bit value of the third bit is always “0”, it can be used as a bit representing a separation point between the start bit and the numeric bit. Therefore, the third bit is hereinafter referred to as “separation bit”. In this embodiment, the start bit is included in the character signal bit pattern. However, the start bit may not be included in the bit pattern of the character signal.

  As shown in FIG. 4B, the signal currents of the 11 types of characters described above always have the bit values of the first bit (start bit) and the fourth bit (first bit of the number bits) set to “1”. Therefore, the unit current exists, and the bit value of the third bit (separation bit) is always “0”, so that the unit current does not exist. Hereinafter, this regularity is referred to as “regularity of signal current”.

  In the example shown in FIG. 3, one code is composed of a 5-digit character string. Thus, in the embodiment, a description will be given assuming that one code is composed of a character string having a predetermined number of characters. In addition, if the character string key-input by the operator is less than a predetermined number of characters (here, 5 digits), the transmitter 10 is placed before the character string key-input by the operator. It is assumed that the middle point “·” is inserted for the number of missing digits as a character meaning “not entered”. Therefore, in such a case, the transmitter 10 generates a signal current representing the midpoint “·” corresponding to the number of missing digits and the numbers “0” to “9” keyed by the operator. Output to the power supply wiring Wi. The signal current output to the power supply wiring Wi is combined with the general load current flowing through the power supply wiring Wi and then input to the receiver 60 from the power supply wiring Wi.

  It is preferable that the transmitter 10 and the receiver 60 described above can set the magnitude of the unit signal in accordance with the magnitude of the general load current flowing through the power wiring Wi to be inspected. The reason is that even if the operation status of a general load, that is, an electrical product is constant, the general load current varies somewhat due to fluctuations in the power supply voltage, etc. This is because the unit 60 and thus the signal current cannot be detected by the device 60. The reason for this will be described in detail below.

  For example, when the general load current fluctuates by 5% and the unit current is 1.0 ampere, the case where the general load current is 10 amperes and 50 amperes is compared. Shall. Then, when the magnitude of the general load current is 10 amperes, the fluctuation amount of the general load current is 10 × 0.05 = 0.5 amperes. This variation is smaller than the unit current. Therefore, the receiver 60 can detect the unit current, that is, the signal current from the detected current. On the other hand, when the magnitude of the general load current is 50 amperes, the fluctuation amount of the general load current is 50 × 0.05 = 2.5 amperes. This variation is larger than the unit current. Therefore, the receiver 60 cannot detect the unit current, that is, the signal current from the detected current. Therefore, the transmitter 10 and the receiver 60 have a unit current magnitude and a general load current magnitude that flows through the power wiring Wi to be inspected so that the receiver 60 can always detect the signal current from the detected current. It is preferable to set it accordingly.

(Details of synthesized current)
Hereinafter, the details of the combined current will be described with reference to FIG. FIG. 5 is a diagram showing a current waveform. FIG. 5 shows the waveform of the general load current as “waveform 1”, the waveform of the signal current of the character signal representing the character “7” as “waveform 2”, and the general load current and the signal current are combined. The waveform of the combined current is shown as “waveform 3”.

  For example, in the electric circuit shown in FIG. 2, it is assumed that a general load current (crest value ± 4 amperes) (see “waveform 1” in FIG. 5) flows in the power supply wiring Wi. The “peak value” means the peak of the waveform in the alternating current. This “peak value” has the maximum amplitude value. Hereinafter, the “crest value” may be referred to as the “maximum value” or “current value” of the current.

  Here, in the electric circuit shown in FIG. 2, a signal current (see “waveform 2” in FIG. 5) representing the character “7” of (peak value ± 2 amperes) is output from the transmitter 10 to the power supply wiring Wi. To do. The configuration of the signal current representing the character “7” is as shown in Table 2 below.

In Table 2, the configuration of the signal current is indicated by the presence / absence of a unit current flowing in each bit section. In the example shown in FIG. 5, the transmitter 10 outputs the signal current representing the character “7” shown in Table 2 to the power supply wiring Wi in the section of 9 periods (9 bits) of the bit sections 2 to 10. Yes. The transmitter 10 outputs a signal current of one character consisting of the first 9 bits to the power supply wiring Wi, and then places the next 9 bits at intervals of a predetermined separation interval, that is, a predetermined bit interval. Is output to the power supply wiring Wi. In the example shown in FIG. 5, for a signal current of 9 cycles per character string, a 2- cycle (bit) interval (specifically, a bit) between the preceding character and the following character. 2 periods (2 bits) of sections 11 and 12). Therefore, when the transmitter 10 outputs a code of a five-digit character string, it outputs 9 cycles × 5 + 2 cycles × 4 = 53 cycles , that is, a time of about 1 second.

  The signal current as the character signal output to the power supply wiring Wi is combined with the general load current in which each unit current constituting the signal current flows through the power supply wiring Wi. As a result, a combined current (see “Waveform 3” in FIG. 5) is generated. This combined current has a peak value of 4 amperes in the section where the peak value of the unit current is not generated (that is, the bit sections 1, 3, 4, 7, 11, 12, 14). In addition, this combined current is signaled to 4 amps of the peak value of the general load current in the section where the peak value of the unit current is generated (that is, the bit sections 2, 5, 6, 8, 9, 10, 13). By adding 2 amps of the peak value of the current, the peak value in these sections is 6 amps.

(System operation)
The outline of the system operation will be described below.

  The operator operates the transmitter 10 and the receiver 60 as follows in order to cause the system of the embodiment to perform such detection.

  That is, the operator first goes to the place where the watt hour meter Wh is installed with the receiver 60 and the transmitter 10.

  Then, the operator turns on the power of the receiver 60 by turning on the power switch 62 of the receiver 60. When the power is turned on, the receiver 60 displays a menu screen on the display 66 in response thereto. This menu screen includes, for example, a column for inputting an initial code shown in Table 3 below. The operator operates the input key 64 of the receiver 60 to input an arbitrary initial code.

  Here, it is assumed that the operator has input a code (“2”) corresponding to a 100/200 V type single-phase three-wire power supply method as an initial code. As a result, the receiver 60 enters a standby state for receiving a combined signal corresponding to a 100/200 V single-phase three-wire power supply method.

  Next, the operator supplies power to the current transformers CT1 and CT3 of the receiver 60 in a state where only a general load current flows through the power supply wiring Wi, that is, in a state where the transmitter 10 does not output an inspection signal. By connecting the voltage terminal clips CL1, CL2, and CL3 to the A line, the B line, and the C line of the load-side power supply wiring Wi, respectively, As shown in FIG. 1, the receiver 60 is connected to the power supply wiring Wi.

  At this time, the receiver 60 includes a general load current that does not include the component of the unit current of the inspection signal, that is, the current of “waveform 3” flowing in the bit section 1 of FIG. Current consisting only of the component) is input as the detection current.

  The pattern detection means 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 responds when the detection current of “waveform 3” flowing in the bit section 1 in FIG. 5 is input after A / D conversion. Then, the current value (crest value) of the input detection current is measured, and the signal is stored as digital data in the operation data storage unit 74 b of the storage unit 74. As a result, the receiver 60 stores the current value of the general load current, that is, the current value (crest value) of the combined current first measured after the power is turned on, in the operation data storage unit 74 b of the storage unit 74.

  Next, as shown in FIG. 1, the operator connects the transmitter 10 to the power supply wiring Wi stretched around the building. At this time, CT1 and CT3 of the receiver 60 are connected to the A line and the B line of the power supply wiring Wi. Therefore, the operator connects the transmitter 10 to the A line and the B line of the power supply wiring Wi by any one of the following first and second connection methods, and outputs an inspection signal as an analog signal.

  To that end, first, as a first connection method, the operator takes the transmitter 10 and goes to the installation location of the outlet CN installed in the residence to be inspected, and connects the plug PL of the transmitter 10 to the power supply wiring Wi. Plug in one of the outlets CN in the house connected to the A line, and output an inspection signal, and then connect the plug PL of the transmitter 10 to the B line of the power supply wiring Wi. Insert the inspection signal in one place.

  Alternatively, as a second connection method, the operator takes the transmitter 10 and goes to the place where the distribution board B (see FIG. 21) is installed, and connects the plug PL of the transmitter 10 to the socket of the cable CB shown in FIG. Next, the voltage terminal clips cl1 and cl2 of the cable CB are connected to the A line of the power supply wiring Wi connected to the terminal 1L of the distribution board B and the B line of the power supply wiring Wi connected to the terminal 3L. To output an inspection signal.

  In actual work, it is impossible to determine whether the outlet CN installed in a house or the like is connected to the A line or the B line from the appearance. For this reason, the operator often connects the transmitter 10 to the A line and the B line of the power supply wiring Wi by the second connection method.

Next, the operator inputs an arbitrary code (for example, a room number) composed of a plurality of character strings from the input key 14 of the transmitter 10. Here, a description will be given assuming that the code is composed of a predetermined number of M digits (for example, 5 digits). In response to the input of a code by the operator, the inspection signal generation unit 20 of the transmitter 10 responds to the reference data storage unit 24a of the storage unit 24 from the reference data storage unit 24a in units of character signal bit patterns. Read out each reference configuration pattern of signal current of the character signal corresponding to 11 types of characters specified in Table 1 stored in advance, and correspond to the input characters, that is, numbers one by one based on each reference configuration pattern Each character signal to be generated is generated as a signal current in an N-bit interval (here, 9-bit interval) as described with reference to Table 1 and FIG. When the character string key-input by the operator is less than the predetermined M digits, for example, is (M-2) digits, the inspection signal generation unit 20 of the transmitter 10 performs the key input by the operator. Insert the middle point “·” for the two missing digits as a character meaning “not entered” in front of the written character string, and change the signal current to the power frequency of 50 Hz or 60 Hz one character at a time. Generated in a synchronous cycle with a period as a unit.

When the inspection signal generation unit 20 of the transmitter 10 generates the inspection signal, in response to this, the generated inspection signal is sent to the A line of the power supply wiring Wi on the load side via the voltage terminal clips cl1 and cl2 of the cable CB. , And C line are sequentially output one character at a time. Since a 1-bit section is a 1- cycle section, a signal current of one character is divided into 9- period sections in a unit current mode per 1-bit section (in the bit sections 2 to 10 in FIG. 5). Flowing “Waveform 2”). As described above, in the embodiment, a predetermined interval (in this case, a period of two periods of the bit sections 11 and 12 in FIG. 5) between which the signal current does not exist is set between the letters. Is set. Transmitter 10, following the section of the two periods, and outputs the second character of the signal current (bit section 13 after the 9 cycles of the section of FIG. 5).

  As already described with reference to FIG. 5, the signal current output to the power supply wiring Wi is combined with the general load current flowing in the power supply wiring Wi, and the “waveform flowing in the bit sections 2 to 10 in FIG. 5. 3 ”, that is, a combined current composed of both components of a general load current and a signal current (specifically, a unit current portion). Here, as an example, the peak value of the current of “waveform 3” flowing in the bit sections 2 to 10 in FIG. 5, that is, the combined current composed of both the general load current and the signal current is “6 amperes”. It will be explained as a thing.

In the pattern detection means 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60, the detection current of “waveform 3” flowing in the bit sections 2 to 10 in FIG. 5 is A / D converted and input as a digital signal. In response to this, the current value (crest value) of the detected current is detected. The determination unit 72b of the receiver 60 determines whether or not the detected current value and the detected current are combined current components of the general load current and the signal current for each cycle of the power supply frequency with respect to the detected current. In order to determine whether or not, a threshold value (a “upper limit threshold value” described later) as a digital value determined in advance is compared. Based on this comparison, when the current value of the detected current exceeds the threshold, it is determined that there is a unit current that flows in the section of one cycle compared to “there is a signal current” with respect to the combined current. On the other hand, when the current value of the detected current is a value equal to or smaller than the threshold value, it is determined that there is no unit current flowing in the section of one cycle compared with “no signal current” for the detected current. As a result, the receiver 60 has a combined current section (hereinafter referred to as a “section with a signal current”) composed of both components of the detected current, the general load current, the signal current, and thus the unit current, and the signal current and the unit. By separating a section consisting only of the general load current component that does not include a current component (hereinafter referred to as a “no signal current” section), a waveform pattern of a unit current for each cycle is detected.

The relationship between the threshold value and the general load current and unit current in the bit period of one cycle of the signal current is expressed by the following equation (1).

  | (Peak value of general load current) | ≦ Threshold <| (Peak value of general load current + Peak value of unit current) | = | (Peak value of composite current) | (1)

For example, assume that the threshold is 5 amperes. And the determination part 72b of the receiver 60 shall compare the electric current value and threshold value of the detection electric current shown in FIG. 5 for every area of 1 period . In this case, the pattern detecting means 73a of the determination unit 72b has no unit current with respect to the detected current when the current value of the detected current, that is, the current value of the combined current is not more than ± 5 amperes. “None”, and when the current value of the detected current, that is, the current value of the combined current exceeds ± 5 amperes, it is determined that “there is a signal current” because there is a unit current for the detected current. . The pattern detection unit 73a of the determination unit 72b sequentially performs such determination, and temporarily stores the determination result as digital data in the operation data storage unit 74b of the storage unit 74.

  When the pattern detection means 73a of the determination unit 72b stores the determination result in the operation data storage unit 74b, the bit section “with signal current” is set to the bit value “1” and the bit section “without signal current” is set to the bit value. Store in bit pattern set to “0”. This bit pattern corresponds to the appearance pattern of the current waveform of the unit current.

  Next, the character signal of the character corresponding to these appearance patterns is specified from the appearance patterns of the waveform pattern of the unit current obtained by sequentially detecting in this way.

  This specification is performed as follows. In response to storing the determination result, the character signal specifying unit 73b of the determination unit 72b reads a bit pattern representing the appearance pattern of the unit current from the operation data storage unit 74b and refers to the reference data storage unit 74a of the storage unit 74. Each reference configuration pattern of the signal current of the character signal corresponding to the 11 types of characters specified in Table 1 stored in advance in the bit pattern unit of the character signal in the data storage unit 74a is read, and the appearance pattern of the unit current and the 11 types Each reference pattern of each character is sequentially compared between bit patterns.

  In this comparison, if the bit pattern representing the appearance pattern of the unit current matches any of the 11 types of character reference configuration patterns, this bit pattern is the character signal represented by the matching reference configuration pattern. Since the current is determined, the character signal can be specified from the determined signal current. Therefore, in this comparison, when the character signals of all 11 types of characters are sequentially specified, the check signals are obtained by time-arranging the character signals in the specified order, and the check signals are operated as digital data. Once stored in the data storage unit 74b. Thus, the inspection signal can be detected from the detection signal by detecting the appearance pattern of the unit current from the inspection signal and determining the character signal corresponding to each character from the detected appearance pattern of the unit current.

  Next, the code acquisition unit 73c of the determination unit 72b acquires a code from the detected inspection signal. Therefore, the code acquisition means 73c reads the inspection signal from the operation data storage unit 74b, and the character signals constituting each character signal included in the inspection signal have a corresponding relationship with each character. To each character.

  An example of this conversion is shown in Table 4 below.

  In the example of this table, the presence / absence of a unit current is determined in each bit section from the first bit section to the ninth bit section, and a unit current appearance pattern is formed. It is indicated that the character corresponding to this appearance pattern is “7”.

  The code acquisition unit 73c associates the converted character with the appearance pattern of the signal current of the character signal and stores it as digital data in the detection code storage unit 74c of the storage unit 74. In this manner, a character string having a predetermined number of digits is stored as digital data in the detection code storage unit 74c, thereby acquiring a code key-input by the operator.

  When the character string stored in the detection code storage unit 74c is aligned with a predetermined number of digits (here, 5 digits), the display control unit 72c responds to the 5-digit character from the detection code storage unit 74c. The column is read, and the read five-digit character string is output to the display 66 and displayed on the display 66 as a code key-input by the operator.

As already described with reference to FIG. 4B, according to the embodiment, by limiting the types of characters to be handled to 11 types of numbers “0-9” and midpoint “•”. The bit values of the first bit (start bit) and the fourth bit (the first bit of the numeric bits) are always “1”, and the bit value of the third bit (separation bit) is always “0”. The regularity of the signal current is obtained. Thus, according to the embodiment, the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 compares the waveform of the combined current of the nine periods and the regularity of the signal current to determine one signal. It is possible to easily determine whether or not the waveform of the combined current in the section corresponding to the nine periods corresponding to the character signal includes the signal current. As a result, the receiver 60 can easily and accurately detect the signal current corresponding to the character from the combined current.

  Hereinafter, the operation of the receiver 60 will be described in detail with reference to FIG. 6, FIG. 7, and FIG. FIG. 6 is an operation flowchart of the system according to the embodiment. FIG. 7 is an explanatory diagram of threshold values. FIG. 7 shows a waveform of the general load current as “waveform 1”, a waveform of the signal current representing the character “7” as “waveform 2”, and a combined current obtained by synthesizing the general load current and the signal current. Is shown as “Waveform 3”.

A combined current as a detection current shown as “waveform 3” in FIG. 7 is sequentially input from the power supply wiring Wi to the receiver 60 sequentially for each cycle of the commercial frequency, and the current value of the combined current is measured as needed. The measurement data is temporarily stored in the operation data storage unit 74b of the storage unit 74. And the inspection signal detection part 70 of the receiver 60 performs a series of operation | movement shown with a flow in FIG. As already described, the signal current is formed by unit currents that flow in one period section at a location designated corresponding to the character. Here, it is assumed that the theoretical signal current corresponding to the magnitude of the general load current, that is, the maximum value b of the unit current is stored in advance in the reference data storage unit 74a as digital reference data. In addition, in the reference data storage unit 74a, equations to be described later are stored in advance, and in the operation described below, the pattern detection unit 73a of the determination unit 72b of the inspection signal detection unit 70 of the receiver 60 performs reference data Each formula is read from the storage unit 74a, and each calculation is performed according to the read formula.

That is, first, the pattern detection means 73a of the determination unit 72b reads the digital measurement data (see FIG. 7 [Waveform 3]) stored in the operation data storage unit 74b, and detects the maximum value a of the detected current in the first cycle. Is measured (S105). As shown in FIG. 7, the detection current in the first cycle is a current consisting only of a general load current component that does not include a signal current component. Therefore, the maximum value “a” of the detection current in the first cycle represents the maximum value of the general load current. In the example shown in FIG. 7, the maximum value a of the detected current in the first cycle is 4 amperes. Therefore, in the example shown in FIG. 7, the pattern detection means 73a of the determination unit 72b measures 4 amperes as the maximum value a of the detected current in the first cycle .

The pattern detection unit 73a measures the maximum value a of the detection current in the first cycle .

When the pattern detection means 73a of the determination unit 72b measures the maximum value a of the detection current in the first cycle , in response to this, the signal current and accordingly the maximum value b of the unit current are read from the reference data storage unit 74a. According to the equation (2), a threshold (hereinafter referred to as “lower threshold”) c for detecting the current input to the receiver 60 is calculated as digital data, and the calculated lower threshold c is stored as operation data. Store in the part 74b (S110).

  c = (a−b × 0.2) (2)

  Hereinafter, the operation of calculating or specifying the value and storing it in the operation data storage unit 74b is referred to as “setting”.

In the example shown in FIG. 7, the maximum value a of the detection current in the first cycle is 4 amperes, and the maximum value b of the signal current is 2 amperes. Therefore, the calculation result of Expression (2) is 3.6. Therefore, in the example shown in FIG. 7, the pattern detection unit 73a of the determination unit 72b sets a digital value representing 3.6 amperes as the lower limit threshold c in the operation data storage unit 74b.

When the threshold value c is set, the pattern detection means 73a of the determination unit 72b reads the measurement data (see FIG. 7 [Waveform 3]) stored in the operation data storage unit 74b in response to the threshold c and reads the second cycle . The maximum value d of the detected current is measured (S115). As shown in FIG. 7, the detection current in the second cycle is the first bit, that is, the start bit section of the combined current composed of both the general load current and the signal current. In the example shown in FIG. 7, the maximum value d of the detection current in the second cycle is 6 amperes. Therefore, in the example shown in FIG. 7, the pattern detection unit 73a of the determination unit 72b measures 6 amperes as the maximum value d of the detection current in the second cycle . When the pattern detection unit 73a measures the maximum value d of the detection current in the second cycle , in response to this, the lower limit threshold c is read from the operation data storage unit 74b, and the maximum value d of the detection current in the second cycle is It is determined whether it is larger than the lower limit threshold c (S120).

When it is determined in S120 that the maximum value d of the detected current in the second cycle is larger than the lower limit threshold c, the process proceeds to S125, and the maximum value d of the detected current in the second cycle is equal to or lower than the lower limit threshold c. If it is determined that there is, the process returns to S105 via S130.

That is, when it is determined in S120 that the maximum value d of the detected current in the second cycle is larger than the lower limit threshold c, the pattern detection unit 73a of the determination unit 72b detects according to the following equation (3). A predetermined threshold (that is, “upper limit threshold”) e is calculated to determine whether or not the current is a combined current composed of both components of the general load current and the signal current, and the calculated upper limit threshold is calculated. e is stored as digital data in the operation data storage 74b (S125).

  e = (a + b × 0.8) (3)

In the example shown in FIG. 7, as already described, the maximum value a of the detection current in the first cycle is 4 amperes, and the maximum value b of the signal current is 2 amperes. . Therefore, the calculation result of Expression (3) is 5.6. Therefore, in the example illustrated in FIG. 7, the pattern detection unit 73 a of the determination unit 72 b sets a digital value representing 5.6 amperes as the upper limit threshold e.

On the other hand, when it is determined in S120 that the maximum value d of the detected current in the second cycle is equal to or lower than the lower limit threshold c, the pattern detection unit 73a of the determining unit 72b applies the detected current in the second cycle to one cycle. The eye detection current is set again (S130), and the operations of S105 to S120 are repeated again.

After S125, the pattern detection unit 73a of the determination unit 72b, setting the upper threshold e, in response thereto, reads out the maximum value d of the detection current of the second cycle from the operation data storage section 74b, the second period of It is determined whether or not the maximum value d of the detected current is larger than the upper limit threshold e (S135).

If it is determined in S135 that the maximum value d of the detected current in the second cycle is larger than the upper limit threshold e, the process proceeds to S140, and the maximum value d of the detected current in the second cycle is equal to or lower than the upper limit threshold e. If it is determined that there is, the process returns to S105 via S145.

That is, when it is determined in S135 that the maximum value d of the detected current in the second cycle is larger than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b determines the first bit (start bit) of the signal current. “1” indicating that there is a unit current is set as the bit value corresponding to (interval), that is, the operation data storage unit 74b of the storage unit 74 is associated with “1” as the bit value of the first bit of the signal current. (S140).

On the other hand, when it is determined in S135 that the maximum value d of the detected current in the second cycle is equal to or less than the upper limit threshold e, the pattern detection unit 73a of the determining unit 72b applies the detected current in the second cycle to one cycle. The eye detection current is reset (S145), and the operations of S105 to S135 are repeated again.

After S140, when the pattern detection means 73a of the determination unit 72b sets “1” as the bit value corresponding to the first bit of the signal current, that is, the start bit section, the operation data storage unit 74b responds to this. The stored measurement data (see [Waveform 3] in FIG. 7) is read and the maximum value f of the detected current in the third period is measured (S150). As shown in FIG. 7, the detection current in the third cycle is the second bit of the combined current consisting of both the general load current and the signal current, that is, the spare bit section. In the example shown in FIG. 7, the maximum value f of the detection current in the third period is 4 amperes. Therefore, in the example shown in FIG. 7, the pattern detection unit 73a of the determination unit 72b measures 4 amperes as the maximum value f of the detection current in the third period . When the determination unit 72b measures the maximum value f of the detected current in the third cycle , in response to this, the determination unit 72b reads the upper limit threshold value e from the operation data storage unit 74b, and the maximum value f of the detected current in the third cycle is the upper limit threshold value. It is determined whether it is smaller than e (S155).

If it is determined in S155 that the maximum value f of the detected current in the third period is smaller than the upper limit threshold e, the process proceeds to S170 through S160, and the maximum value f of the detected current in the third period is the upper limit threshold If it is determined that it is equal to or greater than e, the process proceeds to S170 via S165.

That is, when it is determined in S155 that the maximum value f of the detected current in the third period is smaller than the upper limit threshold e, the pattern detecting unit 73a of the determining unit 72b determines the second bit (preliminary bit) of the signal current. “0” representing that there is no unit current is set as the bit value corresponding to (interval), that is, the operation data storage unit 74b of the storage unit 74 is associated with “0” as the bit value of the second bit of the signal current. (S160).

On the other hand, if it is determined in S155 that the maximum value f of the detected current in the third period is equal to or greater than the upper limit threshold e, the pattern detecting unit 73a of the determining unit 72b determines the second bit (preliminary) of the signal current. "1" is set as the bit value corresponding to the bit interval), that is, "1" is associated with the bit value of the second bit of the signal current and stored in the operation data storage unit 74b of the storage unit 74 (S165). .

After S160 or S165, the pattern detection means 73a of the determination unit 72b sets a bit value corresponding to the second bit (preliminary bit section) of the signal current, and stores it in the operation data storage unit 74b in response thereto. The measured data (see FIG. 7 [Waveform 3]) is read, and the maximum value g of the detected current in the fourth period is measured (S170). As shown in FIG. 7, the detection current in the fourth period is the third bit, that is, the separation bit section of the combined current composed of both the general load current and the signal current. In the example shown in FIG. 7, the maximum value g of the detection current in the fourth period is 4 amperes. Therefore, in the example shown in FIG. 7, the pattern detection unit 73a of the determination unit 72b measures 4 amperes as the maximum value g of the detection current in the fourth period .

When the pattern detection means 73a of the determination unit 72b measures the maximum value g of the detection current in the fourth cycle , in response to this, the upper limit threshold e is read from the operation data storage unit 74b and the maximum of the detection current in the fourth cycle. It is determined whether the value g is smaller than the upper limit threshold e (S175).

If it is determined in S175 that the maximum value g of the detected current in the fourth cycle is smaller than the upper limit threshold e, the process proceeds to S190 through S180, and the maximum value g of the detected current in the fourth cycle is the upper threshold. If it is determined that it is equal to or greater than e, the process returns to S105 via S185.

That is, when it is determined in S175 that the maximum value g of the detected current in the fourth period is smaller than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b determines the third bit (separation bit) of the signal current. "0" is set as the bit value corresponding to (interval), that is, "0" is associated with the bit value of the third bit of the signal current and stored in the operation data storage unit 74b of the storage unit 74 (S180).

On the other hand, when it is determined in S175 that the maximum value g of the detected current in the fourth cycle is equal to or greater than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b applies the detected current in the fourth cycle to one cycle. The eye detection current is set again (S185), and the operations of S105 to S175 are repeated again.

After S180, when the pattern detection means 73a of the determination unit 72b sets “0” as the bit value corresponding to the third bit of the signal current, that is, the separation bit section, in response to this, the pattern detection unit 73a stores the operation data storage unit 74b. The stored measurement data (see [Waveform 3] in FIG. 7) is read, and the maximum value h of the detected current in the fifth cycle is measured (S190). As shown in FIG. 7, the detection current in the fifth cycle is the fourth bit of the combined current composed of both the general load current and the signal current, that is, the first bit section of the numerical bits. In the example shown in FIG. 7, the maximum value h of the detection current in the fifth cycle is 6 amperes. Therefore, in the example shown in FIG. 7, the pattern detection means 73a of the determination unit 72b measures 6 amperes as the maximum value h of the detection current in the fifth cycle .

When the pattern detection unit 73a of the determination unit 72b measures the maximum value h of the detection current in the fifth cycle , in response to this, the upper limit threshold e is read from the operation data storage unit 74b, and the maximum of the detection current in the fifth cycle. It is determined whether the value h is larger than the upper limit threshold e (S195).

If it is determined in S195 that the maximum value h of the detection current in the fifth cycle is greater than the upper limit threshold e, the process proceeds to S200, and the maximum value h of the detection current in the fifth cycle is equal to or less than the upper limit threshold e. If it is determined that there is, the process returns to S105 via S205.

That is, when it is determined in S195 that the maximum value h of the detected current in the fifth cycle is larger than the upper limit threshold e, the pattern detecting unit 73a of the determining unit 72b performs the fourth bit (numerical bit) of the signal current. "1" is set as the bit value corresponding to the first bit section of the signal current, that is, "1" is associated with the bit value of the fourth bit of the signal current and stored in the operation data storage unit 74b of the storage unit 74 ( S200).

On the other hand, when it is determined in S195 that the maximum value h of the detection current in the fifth cycle is equal to or less than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b applies the detection current in the fifth cycle to one cycle. The eye detection current is reset (S205), and the operations of S105 to S195 are repeated again.

After S200, the pattern detection means 73a of the determination unit 72b sets “1” as the bit value corresponding to the fourth bit of the signal current (the first bit section of the numeric bit), and in response to this, the operation data The measurement data (see FIG. 7 [Waveform 3]) stored in the storage unit 74b is read, and the maximum value x of the detected current in the (5 + n) period (where n is an integer of 1 to 5) is measured (S210). ). As shown in FIG. 7, the detection current in the (5 + n) period is the fifth to ninth bits of the combined current composed of both the general load current and the signal current. In the example shown in FIG. 7, the detected currents in the sections of the sixth, eighth, ninth, and tenth periods (that is, the combined current including the signal current components in the fifth, seventh, eighth, and ninth bit sections). The maximum value x is 6 amperes, and the maximum value x of the detection current in the seventh cycle (that is, the combined current including the signal current component in the 6th bit section) is 4 amperes. Therefore, in the example illustrated in FIG. 7, the pattern detection unit 73 a of the determination unit 72 b detects the detection currents in the sixth, eighth, ninth, and tenth periods (that is, the fifth, seventh, eighth, and ninth bit sections). As the maximum value x of the combined current including the signal current component), 6 amperes is measured, and the maximum value x of the detected current in the seventh cycle (that is, the combined current including the signal current component in the sixth bit section) is measured. Measure 4 amps.

When the pattern detection unit 73a of the determination unit 72b measures the maximum value x of the detection current in the (5 + n) period , in response to this, the pattern detection unit 73a determines whether n is smaller than 5 (S215).

  When it is determined in S215 that n is smaller than 5, the process proceeds to S220, and when it is determined that n is 5 or more, the process proceeds to S235.

That is, when it is determined in S215 that n is smaller than 5, the pattern detection unit 73a of the determination unit 72b responds to the detection current of the (5 + n) period from the operation data storage unit 74b. The maximum value x and the upper limit threshold e are read out, and it is determined whether or not the detected current maximum value x in the (5 + n) period is larger than the upper limit threshold e (S220).

When it is determined in S220 that the maximum value x of the detected current in the (5 + n) period is larger than the upper limit threshold e, the pattern detecting unit 73a of the determining unit 72b determines the (4 + n) th bit of the signal current. “1” is set as the bit value corresponding to the section, that is, “1” is associated with the bit value of the (4 + n) th bit section of the signal current and stored in the operation data storage section 74 b of the storage section 74 ( S225). Thereafter, the process returns to S210, and the pattern detection means 73a of the determination unit 72b repeats the operations of S210 to S225 again.

On the other hand, when it is determined in S220 that the maximum value x of the detected current in the (5 + n) period is equal to or less than the upper limit threshold e, the pattern detection unit 73a of the determination unit 72b determines the (4 + n) th of the signal current. “0” is set as the bit value corresponding to the bit section, that is, “0” is associated with the bit value of the (4 + n) th bit section of the signal current in the operation data storage section 74 b of the storage section 74. Store (S230). Thereafter, the process returns to S210, and the pattern detection means 73a of the determination unit 72b repeats the operations of S210 to S225 again.

  When it is determined in S215 that n is 5 or more, the character signal specifying unit 73b of the determination unit 72b responds to the bit value of the signal current in the section corresponding to 9 bits from the operation data storage unit 74b. Are compared with the reference configuration pattern of the 9-bit section read out from the reference data storage unit 74a, and the corresponding character data (hereinafter simply referred to as “bit pattern”). (Referred to as “character”) (S235). By this verification, it is determined whether or not the bit pattern of the signal current in the section of 9 bits matches any of the numbers “0 to 9” and the midpoint “•”, and is associated with the bit pattern. A character is specified (S240). The character signal specifying means 73b of the determination unit 72b associates the converted character and the bit pattern and stores them in the operation data storage unit 74b as digital data.

  If it is determined in the above-described determination of S240 that the converted character matches one of the numbers “0-9” and the midpoint “•”, the process proceeds to S245, and the converted character is the number “0”. If it is determined that none of the ˜9 ”and the midpoint“ • ”match, the process proceeds to S250.

  That is, when it is determined in S240 that the converted character matches either the number “0-9” or the midpoint “•”, the character signal specifying unit 73b of the determination unit 72b converts the converted character. Characters are stored as digital data in the detection code storage unit 74c of the storage unit 74 (S245). In this character conversion processing, character signals are specified for all of the N characters constituting the inspection signal described above, and stored in the detection code storage unit 74c as a character string made up of M converted characters. Is done. At this time, if there is a previously converted character string, the converted character is the second and subsequent character strings of the code, so the converted character is added after the previously converted character string. And stored in the detection code storage unit 74c of the storage unit 74. Thereafter, the process proceeds to S260. In this way, the accumulated character string is detected as digital data corresponding to the already-described inspection signal from the above-described unit current appearance pattern.

  On the other hand, when it is determined in S240 that the converted character does not match any of the numbers “0 to 9” and the midpoint “•”, the character signal specifying unit 73b of the determination unit 72b converts the converted character. The character “?” Representing the unknown character is associated with the detected character and stored in the detection code storage unit 74c of the storage unit 74 (S250).

  After S250, the display control unit 72c reads the character string stored from the detection code storage unit 74c, and outputs the read character string to the display 66 together with the number of inspection signal receptions. As a result, the display 66 displays a character string corresponding to the number of inspection signal receptions (S255). Thereafter, the process proceeds to S270.

  Next, the code acquisition unit 73c of the determination unit 72b reads the bit pattern of the inspection signal that is stored in the detection code storage unit 74c and is composed of M N-bit character signals, and is input from the reference data storage unit 74a. A character reference bit pattern corresponding to the M-digit character constituting the code is read out, and both bit patterns are collated to obtain an M-digit code. This code acquisition will be described below.

  After S245, when the code acquisition unit 73c of the determination unit 72b stores the converted character in the detection code storage unit 74c of the storage unit 74, in response to this, the character string stored from the detection code storage unit 74c is stored. Whether or not the read character string is 5 (M = 5) digits is determined by the above-described bit pattern collation (S260).

  If it is determined in S260 that the read character string is 5 digits, the process proceeds to S270 via S265, and if it is determined that the read character string is not 5 digits, the process Proceeds directly to S270.

  That is, if it is determined in S260 that the read character string is 5 digits, the display control unit 72c reads the character string stored from the detection code storage unit 74c in response to this. The read character string is D / A converted together with the number of inspection signal receptions and output to the display 66. As a result, the display 66 displays a character string corresponding to the number of inspection signal receptions (S265). Thereafter, the process proceeds to S270.

After S255 or S265, the determination unit 72b resets the detection current of the next cycle to the detection current of the first cycle (S270), and repeats the same operation again.

  In this way, the receiver 60 acquires the code from the combined current flowing through the power supply wiring Wi and displays it on the display 66.

  By the way, a receiver according to a conventional wiring path inspection system (hereinafter referred to as “conventional receiver”) has a “signal” with respect to the combined current, even though the combined current is a current including a signal current component. There was an inconvenience that sometimes it was determined that there was no current. Hereinafter, this inconvenience will be described with reference to FIG. FIG. 8 is an explanatory diagram of threshold values.

  That is, the general load current may decrease in a section between characters. For example, in the example shown in FIG. 8, the general load current shown as “waveform 1” has a peak value of 4 amperes in the bit sections 1 to 10, whereas the peak value in the bit section 11 and later is higher. It is 3 amps. For this reason, the combined current shown as “waveform 3” has a peak value of 5 amperes in the bit section 13 and thereafter even though it is a current including a signal current component. In such a case, in the case of a conventional receiver, since the peak value of the combined current 5 amperes and the threshold value of 5 amperes are the same value, and the peak value is equal to or less than the threshold value, It is determined that there is no current. Therefore, in such a case, the conventional receiver determines that “there is no signal current” with respect to the combined current even though the combined current is a current including a signal current component.

  Therefore, in the embodiment of the present invention, the following measures are taken so that such a determination is not made, thereby improving the reception accuracy of the receiver 60.

That is, in the embodiment, the pattern detection unit 73a of the determination unit 72b is generally measured in a section between characters (in the example illustrated in FIG. 8, a section corresponding to two periods of the bit sections 11 and 12). The threshold value (upper threshold value) is reset or changed to a new value (here, “4 amps”) in character units with reference to the peak value of load current (here “3 amps”). .

Specifically, in the embodiment, the reference data storage unit 74a of the storage unit 74 stores in advance a virtual peak value (here, “2 amps”) of the signal current, and the pattern of the determination unit 72b. The detection means 73a obtains the peak value (here, “3 amps”) of the general load current in a section between characters (in the example shown in FIG. 8, a section corresponding to two periods of the bit sections 11 and 12). When measured, a virtual peak value (“2 amps”) of the signal current is read from the reference data storage unit 74a, and the virtual peak of the signal current read to 3 amps of the peak value of the measured general load current Add 2 amps high. As a result, the pattern detecting unit 73a calculates a value of “5 amperes” as a virtual peak value of the combined current including both components of the general load current and the signal current, and both components of the general load current and the signal current are calculated. When the virtual peak value (here, “5 amperes”) of the combined current including the current is calculated, the peak value of the general load current (here, “3 amperes”), the general load current, and the signal A new threshold value is determined between a virtual peak value (here, “5 amperes”) of the combined current including both components of the current. Specifically, it is an intermediate value between “3 amperes” of the peak value of the general load current and “5 amperes” of the virtual peak value of the combined current including both components of the general load current and the signal current. Ampere "is determined as a new threshold. When the pattern detection unit 73a determines a new threshold value, in response to this, the determined new threshold value is compared with the old threshold value (here, “5 amps”) stored in the reference data storage unit 74a. (Here, “4 amps”) is overwritten. Thereby, the receiver 60 resets and changes the threshold value to a new value.

Thus, in this embodiment, the receiver 60 measures the peak value (here, “3”) of the general load current measured at a predetermined interval (here, two periods ) between letters. The threshold is reset to a new value (here, “4 amps”) in character units with reference to “amps”). As a result, the receiver 60 also applies to a combined current including a general load current whose peak value is smaller than the value of the previous character (here, a combined current after the section (13) shown in FIG. 8). , “With signal current” can be determined. Therefore, this embodiment can reduce the frequency of occurrence of reception errors, thereby improving the reception accuracy.

  In the above description, the new threshold value has been described as 4 amperes. However, strictly speaking, the pattern detection means 73a of the determination unit 72b may set the new threshold value as follows.

That is, the pattern detection means 73a of the determination unit 72b uses the maximum value of the detected current first measured after the power is turned on (here, the current value “4 amperes” of the combined current in the first cycle shown in FIG. 8). The maximum value a of the general load current is stored in the operation data storage unit 74b of the storage unit 74. Further, the pattern detecting unit 73a calculates the lower threshold c = (ab−0.2) = (4-2 × 0.2) = 3.6 amperes and stores the lower threshold c in the storage unit 74 (specifically Specifically, it is stored in the operation data storage unit 74b). Further, the pattern detecting means 73a calculates the upper limit threshold e = (a + b × 0.8) = (4 + 2 × 0.8) = 5.6 amperes, and sets the upper limit threshold e as the operation data storage unit 74b of the storage unit 74. To store. Further, the pattern detecting means 73a applies a lower limit threshold c with a value of “3.6 amperes” and an upper limit with a value of “5.6 amperes” to the first one-character composite current waveform. By using the threshold value e, the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current are distinguished.

  Here, in the section between characters, the maximum value of the general load current decreases, and the maximum value of the combined current consisting of only the components of the general load current is below the lower threshold value c of 3.6 amperes. Suppose. For example, as shown in FIG. 8, it is assumed that the maximum value of the combined current consisting of only the components of the general load current is 3 amperes in the sections 11 and 12. In this case, the pattern detection unit 73a of the determination unit 72b recalculates the lower threshold c and stores a new value (specifically, c = (3−2 × 0.2) = 2.6 amps). The data is stored in the operation data storage unit 74b of the unit 74. Similarly, the pattern detection means 73a also recalculates the upper threshold e and calculates a new value (specifically, e = (3 + 2 × 0.8) = 4.6 amperes) in the operation data storage unit of the storage unit 74. 74b is stored. The pattern detection means 73a applies the lower limit threshold value c with a value of "2.6 amperes" and the upper limit threshold value e with a value of "4.6 amperes" for the next synthesized current waveform for one character. Is used to divide the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current.

  Here, in the section between characters, the maximum value of the general load current increases, and the maximum value of the combined current composed of only the components of the general load current is 5.6 amperes or more which is the upper limit threshold e. Suppose that For example, suppose that in section 11 and section 12, the maximum value of the combined current consisting of only the general load current component is 6 amperes. In this case, the pattern detection unit 73a of the determination unit 72b recalculates the lower threshold c and stores a new value (specifically, c = (6-2 × 0.2) = 5.6 amps). The data is stored in the operation data storage unit 74b of the unit 74. Similarly, the pattern detection unit 73a also recalculates the upper threshold e and sets a new value (specifically, e = (6 + 2 × 0.8) = 7.6 amps) in the operation data storage unit of the storage unit 74. 74b is stored. The pattern detection means 73a applies a lower limit threshold c with a value of “5.6 amperes” and an upper limit threshold e with a value of “7.6 amperes” for the waveform of the combined current for the next one character. Is used to divide the section of the combined current consisting only of the components of the general load current and the section of the combined current consisting of both the components of the general load current and the signal current.

(Usage example of the wiring route inspection system of the embodiment)
Below, with reference to FIG. 9, FIG. 10, and FIG. 11, it demonstrates per usage method of the power supply wiring inspection system which concerns on embodiment. FIG. 9 is a diagram illustrating an example of display on the display 66 of the receiver 60. FIG. 10 and FIG. 11 are diagrams each illustrating an example of use of the system according to the embodiment.

  As shown in FIG. 9, the receiver 60 obtains a code as described above from the detected current of the combined current flowing through the power supply wiring Wi, and displays the code and the number of inspection signals received by the display control unit 72c. This is displayed on the display 66. Hereinafter, specific examples will be described.

  For example, in the example shown in FIG. 9, when the inspection signal is detected from the detected current at the first time, the receiver 60 receives the number “1” as the number of times of receiving the first inspection signal in the first row and the first time. “101” is displayed as a code corresponding to the inspection signal. In addition, when the inspection signal is detected for the second time, the receiver 60 is “1”, which is the number of times the first inspection signal is received in the first row, and “101”, which is a code corresponding to the first inspection signal. "," 2 "is displayed as the number of times the second inspection signal is received, and" 102 "is displayed as the code corresponding to the second inspection signal. When the inspection signal is received for the third time, the receiver 60 is “1”, which is the number of times the first inspection signal is received, and “101”, which is the code corresponding to the first inspection signal. ”And the number“ 3 ”as the number of times the third inspection signal is received and“ 103 ”as the code corresponding to the third inspection signal are displayed in the second line.

  The operator can check the wiring mistake of the power supply wiring Wi shown in FIG. 10 or FIG. 11 by confirming such display on the display 66 of the receiver 60.

  FIG. 10 shows an example when a wiring error exists. That is, FIG. 10 shows a case where the watt-hour meter for the 101st room is connected to the power supply wiring Wi for the 102th room, and the watt-hour meter for the 102nd room is incorrectly wired to the power wiring for the 101st room. An example is shown. Such an error can be detected by the operator using the transmitter 10 and the receiver 60 as follows.

  First, the operator attaches the receiver 60a to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and sets the receiver 60b to a state waiting for reception. Similarly, the operator 60b connects the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room. Attach to, and set to the state of waiting for reception.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 101 and operates the input key 14 of the transmitter 10 to input, for example, “101” which is a room number. Thereby, the transmitter 10 outputs “·· 101” as a code. At this time, a combined current including a signal component representing a code “·· 101” is input from the power supply wiring Wi to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter Wh102 for the No. 102 room. Therefore, the display 66 of the receiver 60b displays “1”, which is the number of receptions of the first inspection signal, and “101”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room. Therefore, the display 66 of the receiver 60a displays nothing.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 102 and operates the input key 14 of the transmitter 10 to input, for example, “102” which is a room number. Thereby, the transmitter 10 outputs “·· 102” as a code. At this time, a combined current including a signal component representing a code “·· 102” is input from the power supply wiring Wi to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter for the 101st room. Accordingly, the display 66 of the receiver 60a displays “1”, which is the number of receptions of the first inspection signal, and “102”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter for the room 102. For this reason, the display 66 of the receiver 60b still displays “1”, which is the number of times the first inspection signal is received, and “101”, which is a code corresponding to the first inspection signal.

  Next, the operator checks the display on the display 66 of the receivers 60a and 60b attached to the watt-hour meters Wh101 and Wh102. In the example shown in FIG. 10, the codes, that is, the room numbers, displayed on the displays 66 of the receivers 60a and 60b are different. Therefore, the operator can detect the presence of a wiring mistake (here, a mistake in wiring).

  FIG. 11 shows an example where there is a duplicate metric. That is, FIG. 11 shows an example in which the power supply wiring Wi on the power source side of the watt-hour meter Wh102 for the 102nd room is mistakenly connected to the power supply wiring Wi on the load side of the watt-hour meter Wh101 for the 101st room. Such an error can be detected by the operator using the transmitter 10 and the receiver 60 as follows.

  First, the operator attaches the receiver 60a to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and sets the receiver 60b to a state waiting for reception. Similarly, the operator 60b connects the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room. Attach to, and set to the state of waiting for reception.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 101 and operates the input key 14 of the transmitter 10 to input, for example, “101” which is a room number. Thereby, the transmitter 10 outputs “·· 101” as a code. At this time, a combined current including a signal component representing a code “·· 101” is input from the power supply wiring Wi to the receiver 60a attached to the power supply wiring Wi of the watt-hour meter for the 101st room. Therefore, the display 66 of the receiver 60a displays “1”, which is the number of receptions of the first inspection signal, and “101”, which is a code corresponding to the first inspection signal, in the first line. Note that the combined current including the signal component is not input to the receiver 60b attached to the power supply wiring Wi of the watt-hour meter for the room 102. Therefore, the display 66 of the receiver 60b displays nothing.

  Next, the operator connects the transmitter 10 to the outlet CN of the room 102 and operates the input key 14 of the transmitter 10 to input, for example, “102” which is a room number. Thereby, the transmitter 10 outputs “·· 102” as a code. At this time, the receiver 60a attached to the power supply wiring Wi of the watt-hour meter Wh101 for the 101st room and the receiver 60b attached to the power supply wiring Wi of the watt-hour meter Wh102 for the 102nd room are connected to the power line Wi from the power line Wi. A composite current including a signal component representing a code “102” is input. Accordingly, the display 66 of the receiver 60a displays “1”, which is the number of times the first inspection signal is received, and “101”, which is a code corresponding to the first inspection signal, on the first line. In addition, “2” that is the number of times the second inspection signal is received and “102” that is the code corresponding to the second inspection signal are displayed. On the other hand, the display 66 of the receiver 60b displays “1”, which is the number of receptions of the first inspection signal, and “102”, which is a code corresponding to the first inspection signal, in the first line.

  Next, the operator checks the display on the display 66 of the receivers 60a and 60b attached to the watt-hour meters Wh101 and Wh102. In the example shown in FIG. 11, the display 66 of the receiver 60a displays a plurality of codes, that is, room numbers. Therefore, the operator can detect that there is a wiring mistake (here, wiring overlapping connection).

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the gist of the present invention.

  For example, the receiver 60 is preferably configured to be able to continuously receive a predetermined number of times (for example, six times) and display the information on the display 66 as appropriate. For example, the display 66 of the receiver 60 displays the code received for the first time in the first line, and the code received for the second time or later in the second line. Then, when the operator wants to check the code of the number of times of reception, the input key 64 of the receiver 60 is operated (for example, the feed button is pressed), so that the display 66 of the receiver 60 is displayed on the second line. It is assumed that the codes received from the second time to the last are repeatedly displayed. The display 66 of the receiver 60 displays the end of data such as “Data_End”, for example, by pressing the send button after the last received code is displayed. Further, the display 66 of the receiver 60 displays the code received in the first state, that is, the first received code in the first line by pressing the send button after the end of data is displayed, The code received for the second time and thereafter shall be displayed. Further, it is assumed that the display 66 of the receiver 60 erases the displayed reception count and the code corresponding to the reception count when the power switch 62 of the receiver 60 is disconnected.

  Further, the data stored in the detection code storage unit 74c of the receiver 60, that is, the code corresponding to the number of receptions, is preferably externally connected to an input / output unit 78 (not shown) such as a personal computer. It may be possible to output to the device.

The inspection signal detection unit of the receiver according to this embodiment preferably has a signal current for changing the threshold value between the characters for a predetermined period (for example, two periods ). It is recommended to provide a section that does not. Thereby, the wiring route inspection system according to this embodiment can reduce the reception error due to the change in the general load current by changing the threshold value for each character. Therefore, according to the wiring path inspection system according to this embodiment, the signal current reception accuracy can be further improved.

It is a block diagram of the system of an embodiment. It is attachment explanatory drawing to the power supply wiring of the system of embodiment. It is a figure which shows an example of an inspection signal. (A) And (B) is a figure which shows a response | compatibility with the appearance pattern of the character and the waveform of a unit current, respectively. It is a figure which shows the waveform of an electric current. It is an operation | movement flowchart of the system of embodiment. It is explanatory drawing (1) of a threshold value. It is explanatory drawing (2) of a threshold value. It is a figure which shows an example of the display of the display of a receiver. It is a figure (1) showing an example of use of a system of an embodiment. It is FIG. (2) which shows the usage example of the system of embodiment. (A) and (B) are explanatory diagrams of connection errors, respectively. It is explanatory drawing of a wiring error. (A) And (B) is a figure which shows the structure of a wiring path | route inspection system, respectively. It is a figure which shows an example of the current waveform of the inspection signal of one character. It is a figure which shows an example of the check signal of a code | cord | chord, and a timing waveform. (A) And (B) is a figure (1) which shows the structure of a current transformer, respectively. It is a figure (2) which shows the structure of a current transformer. (A) And (B) is a figure which shows the usage example in the case of determining the presence or absence of a connection error, respectively. It is a figure (1) which shows the example of use in determining the presence or absence of a wiring error. It is FIG. (2) which shows the usage example in determining the presence or absence of a wiring error.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wiring route inspection system 10 ... Transmitter 14 ... Input key 16 ... Display (LCD)
20 ... Inspection signal generation unit 22 ... Calculation unit (CPU)
22a ... main control unit 22b ... switch circuit control unit 22c ... display control unit 24 ... storage unit (RAM)
Reference data storage unit 24b Operation data storage unit 24c Input code storage unit 26 DC power supply unit R Dummy load SW Switch (triac)
60 ... Receiver 64 ... Input key 66 ... Display (LCD)
70 ... Inspection signal detection unit 72 ... Calculation unit (CPU)
72a ... main control unit 72b ... determination unit 72c ... display control unit 74 ... storage unit (RAM)
74a ... Reference data storage unit 74b ... Operation data storage unit 74c ... Detection code storage unit 76 ... DC power supply unit 78 ... Input / output unit CL1, CL2, CL3 ... Voltage terminal clip (connection terminal)
CT1, CT3 ... Current transformer (connection terminal)
CN ... Outlet E ... Commercial power supply Wh ... Energy meter Wi ... Power supply wiring

Claims (7)

In a wiring route inspection system that includes a transmitter and a receiver, and inspects the route of the power supply wiring stretched around the building,
The transmitter is
(1) An input unit that can input an arbitrary code represented by M digits (where M is an integer);
(2) An inspection signal comprising character signals of M characters that are output to the power supply wiring in response to the input of the code,
The character signal is
(A) Each bit section is composed of N bits (where N is an integer) allocated to a section of one period of the commercial frequency,
(B) In each of the N bit intervals, a current waveform pattern of each current is generated by flowing one cycle sequentially into each of Q bit segments (where Q is an integer) smaller than N corresponding to the character. It is formed as a signal current including the Q unit currents that cause a pattern,
An inspection signal generation unit for generating the inspection signal,
The receiver is
(1) a display for displaying necessary information including the code;
(2) an inspection signal detector;
When the inspection signal detection unit is connected to the power supply wiring through which a general load current that is an alternating current at a commercial frequency flows,
(A) detecting a current flowing through the power supply wiring as a detection current;
(B) For the detected current detected,
(I) peak value and (ii) the detection current of the detected current is performed a comparison with the general load current and thresholds determined in order to determine whether the combined current of the unit current, the Detect the waveform pattern of unit current,
(C) From the appearance patterns of the Q waveform patterns detected in sequence, the operation of specifying the character signal of the character corresponding to the appearance pattern is performed until the specification of the character signal of the M characters is completed, Detecting the inspection signal;
(D) (i) acquiring the code of the M-digit character from the inspection signal; and (ii) displaying the acquired code on the display; and (e) detecting the waveform pattern of the unit current. for each, the common load current in order to avoid the occurrence of the detected fault of the waveform pattern attributable to changes in, characterized in that on the basis of the peak value of the detected the detected current changes the threshold to a new threshold Wiring route inspection system. In the wiring route inspection system according to claim 1,
(1) The inspection signal generation unit starts an N-bit section of the next character by leaving a separation section composed of a predetermined number of bit sections from the N-bit section of the preceding character, and (2) the inspection signal detection section ,
(A) a change of the threshold is performed based on the peak value of the detected current of the separation zone, and (b) the detection of the waveform pattern of the unit current of the next character, the following following said spaced sections wiring path checking system and performing by comparing the peak value of the detection current of the bit interval of the character and the the new threshold. In the wiring route inspection system according to claim 1 or 2,
(1) The characters are constituted by any one of the numbers “0-9”,
(2) When the signal current is represented by a binary code, the N bit section represents the start of the signal current and the binary value is “1”, followed by the start bit section. A separation bit section having a binary value “0” consisting of a predetermined number of bit sections, and a numeric bit section representing a bit string corresponding to one of the numbers in a 6-bit section following the separation bit section A wiring route inspection system characterized by being configured as described above. In the wiring route inspection system according to claim 3,
The N bit section further includes a spare bit section that is preliminarily used according to operation of a predetermined number of bit sections between the start bit section and the separation bit section. Wiring path inspection system. In the wiring route inspection system according to claim 4,
The N bit period includes the start bit period of the first bit, one spare bit period of the second bit, one separation bit period of the third bit, and the fourth to ninth bits. A wiring route inspection system characterized in that it is a 9-bit section composed of the numeric bit sections. In the wiring route inspection system according to any one of claims 1 to 5 ,
The inspection signal generation unit uses a medium as a symbol meaning that the missing character is “not input” when the number of characters constituting the M-digit character of the code is less than a predetermined number of M characters. A wiring path inspection system characterized by forming and outputting character signals associated with a point “·” for the number of missing characters. In the wiring route inspection system according to any one of claims 1 to 6 ,
The inspection signal generation unit includes a storage unit that stores the number of acquisitions of the code in association with the acquired code, and the number of acquisitions read from the storage unit and the code associated therewith Is displayed on the display ,
The display has a two-line display area;
In the first line of the display, the code received at the first time and the number of acquisitions are displayed,
Wherein the second line of the display, the wiring route inspection system code and the acquisition times received the second time or later, wherein Rukoto appears.

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