JP6587073B2 - Wiring connection inspection method and wiring connection inspection system - Google Patents

Description

  The present invention relates to a wiring connection inspection method for inspecting the correctness of wiring connection between a proximal end side of a commercial power line including a live wire, a neutral wire, and a ground wire, and an indoor lead-in wiring side of the commercial power line, and this method. The present invention relates to an applied wiring connection inspection system.

  According to the internal regulations issued by the Japan Electric Association, it is stipulated that the use of outlets with a grounding pole E is mandatory for power outlets of household electrical appliances such as electric washing machines, microwave ovens, and electric refrigerators. ing.

  The outlet with the grounding wire pole E is generally a live wire electrode L and a neutral wire electrode N connected to the secondary side of the pole transformer TR included in the commercial power line, and a grounding wire electrode connected to the ground. E has three terminals. In the case of TT grounding in which the exposed conductive portion of the grounding wire is directly connected to the ground, the B type grounding (system grounding) construction is applied to the neutral wire pole N, and the D type grounding (equipment) is applied to the grounding wire electrode E. Grounding) construction is applied.

  Further, in a situation where independent grounding is difficult for each floor, such as in a high-rise building, a TN grounding system is adopted in which the exposed conductive portion of the ground wire is connected to the grounding point of the power system. In the case of this TN grounding system, the outlet with the grounding wire pole E is a live wire electrode L and a neutral wire electrode N connected to the secondary side of the pole transformer TR included in the commercial power line, and a neutral electrode. Three terminals are provided, that is, a base end side of N and a grounding wire pole E connected to the ground by a common grounding pole. In this case, common ground construction and structure-based ground construction are applied.

  In a commercial power line, if electrical leakage occurs between wiring, grounding, or electrical equipment connected to a distribution line, not only is it difficult to ensure safety for human bodies, but it may also cause fires, etc. Connected and dangerous. Therefore, leakage detection is performed by pulling the live wire pole L and neutral wire pole N indoors through an earth leakage breaker (ELCB: Earth Leakage Circuit Breaker, GFCI: Ground-Fault Circuit Interrupter, etc.) in the distribution board. When the electric leakage is detected, the live electric wire electrode L and the neutral wire electrode N are interrupted to ensure safety.

  In the construction of laying and wiring the three types of wiring consisting of the live wire pole L, neutral wire pole N, and ground wire pole E of the commercial power line as described above to the power outlet via the distribution board and distribution board, There may be a connection error in the power supply wiring, such as reverse connection between the neutral wire pole N and the ground wire pole E, and the neutral wire pole N and the ground wire pole E connected together.

  If such a connection mistake in power supply wiring is overlooked and used, there is a risk of power interruption due to a leakage breaker provided in the distribution board 50. When the earth leakage circuit breaker is activated, the power supply to the wiring is immediately cut off. Therefore, the power failure due to this causes a great influence on the customer (for example, stoppage of operation). Therefore, in the commercial power line, it is extremely important not to cause the leakage breaker to be interrupted when the connection check or the completion inspection of the power supply wiring is performed.

  In addition, in order to perform installation confirmation and completion inspection in the commercial power line, the electrical connection between the wiring facility on the base end side of the commercial power line (such as the secondary side of the pole transformer TR) and the power outlet on the terminal side of the indoor lead-in wiring There is a case where a method of confirming the electrical continuity is used. In this case, it is necessary to check both the proximal end side and the distal end side (power outlet side). For example, when laying confirmation or completion inspection is performed on the power outlet side, it is necessary to know the measurement state on the base end side. It is necessary to devise such as sending the result to the power outlet and notifying the operator. However, in high-rise buildings, etc., the base side is in the basement and each floor is blocked by concrete, etc., so it is difficult for the wireless transmission function etc. to inform the operator on the power outlet side of the measurement state on the base side. In some cases.

  In addition, recently, power line carrier communication using a power line as a communication line has been put into practical use, and it is possible to perform communication from the base end side to the power outlet side via the power line. However, since power line carrier communication is based on the premise that the power supply wiring itself has been laid correctly, if there is a connection error in the power supply wiring, the measurement status on the base end side is changed to the work on the power outlet side. Cannot be informed.

  For this reason, in such a site, inspection is performed by placing workers on both the base end side and the power outlet side, which greatly reduces workability and efficiency.

  Therefore, a laying tester that can inspect wiring only at the power outlet side has been proposed (see, for example, Patent Document 1). This laying tester applies a DC pulse to a voltage line pole L of an outlet connected to an active line, a neutral line, and a ground line of a power line, and between the neutral line pole N and the ground line pole E. Based on whether or not a voltage corresponding to the DC pulse applied to the voltage line electrode L is output, it is determined whether the wiring of the outlet is correctly laid or incorrectly laid.

  Further, three plug blades of a voltage side plug blade to be connected to the live wire electrode L, a neutral electrode plug blade to be connected to the neutral wire electrode N, and a ground wire plug blade to be connected to the ground wire electrode E A resistance circuit including a high resistance element RH and a low resistance element RL in series is connected between the voltage side plug blade and the neutral electrode plug blade, and a voltmeter is connected between both ends of the low resistance element RL. The ground wire plug blade is connected to the low potential side of the low resistance element RL via the switch SW1, and the measured voltage Von of the voltmeter when the switch SW1 is turned on and when the switch SW1 is turned off There has also been proposed a wiring checker for determining the presence or absence of erroneous wiring based on the measured voltage Voff of the voltmeter (that is, whether or not a voltage of a difference in ground resistance is generated) (see, for example, Patent Document 2).

  Furthermore, a wiring connection determination device that can determine the wiring connection state without informing the power outlet side of the measurement state on the base end side is also proposed, although an inspection device is used on the base end side (see, for example, Patent Document 3). ). This wiring connection determination device injects a single positive / negative pulse voltage signal from a transmitter through a transformer connection into a neutral wire short-circuited to a ground wire G at the base end side of a power supply wiring, The signal between the neutral terminal n of the terminal outlet and the ground terminal g is detected by a determination device. If the polarity of the detected signal is the same as the injected signal, the wirings N and G are correctly connected to the terminals n and g. In the reverse case, it is determined that each connection is reverse.

JP 2014-209058 A JP 2012-173023 A JP-A-6-6916

  However, the laying inspector described in Patent Document 1 described above needs to apply a DC pulse to the voltage line pole L of the power outlet connected to the secondary side of the pole transformer TR included in the commercial power line. Therefore, the shape of components such as a capacitor, a transistor, and a DC pulse discharge limiting resistor used as a DC pulse power source are large, and it is difficult to fit the device in a compact shape. In addition, since the connection terminal is directly connected to the live voltage line electrode L, a protection circuit is also required separately. Therefore, when the laying inspection device described in the cited document 1 is carried out, it is considered that the laying inspection work becomes complicated because the main body becomes considerably large and is not suitable for carrying.

  In addition, when an electric device such as an inverter and a matrix converter that are relatively susceptible to power supply noise is connected to the commercial power supply line to be inspected, a direct current pulse applied from the laying inspection device described in the cited reference 1 If a state close to a momentary power interruption is created, it may cause an abnormal operation or failure of the electrical equipment, which may cause an unexpected disadvantage to the customer and cannot guarantee the safety of the inspection. It is a problem.

  Furthermore, Class B grounding (system grounding) work is applied to the neutral wire pole N, and Class D grounding (equipment grounding) work is applied to the grounding wire pole E. When an electric device is connected to and driven by a TT grounding commercial power supply line having a grounding resistance Re in between, a voltage signal between the neutral wire pole N and the ground wire pole E is A ground voltage Ve over a wide frequency band is always generated due to a leakage current from the power distribution system. Further, when the ground resistance Re is small, the resistance difference between the voltage line pole L to the neutral line pole N and the voltage line pole L to the ground line pole E is small, so that the appearing DC pulse amplitude is adjusted accordingly. Become smaller.

  That is, when the inspection is performed by the laying inspector described in the cited document 1, the influence of the ground voltage Ve in the same frequency band as the DC pulse is removed from the voltage signal between the neutral wire pole N and the ground wire pole E. It is difficult to accurately detect a DC pulse signal that can be a single short width and a minute voltage value applied from the voltage line electrode L, and the wiring between the neutral line electrode N of the outlet and the ground line electrode E is difficult. It is unlikely that it can be accurately and accurately determined whether the laying is correct or incorrect.

  In addition, common ground and structure-based grounding are applied, and a TN grounding type commercial power supply line having only a wire resistance without a grounding resistance Re between the neutral wire electrode N and the ground wire electrode E is cited. When the inspection is performed by the laying inspection device described in Document 1, there is almost no resistance difference between the voltage line electrode L and the neutral wire electrode N and between the voltage line electrode L and the ground wire electrode E. It becomes difficult to detect the DC pulse signal, and as a result, it cannot be accurately determined whether the neutral wire pole N and the ground wire pole E of the outlet are correctly laid or incorrectly laid.

  When performing a wiring inspection using the wiring checker described in Patent Document 2, a resistance (high resistance element RH, low resistance element RL) is interposed between the voltage side and the ground line. When it is turned on, a leakage current is generated through this resistance series circuit, and there is a risk that the leakage breaker is activated.

  Further, when the wiring checker described in Patent Document 2 is used for wiring inspection of a TN grounding type commercial power supply line, if the grounding resistance Re is small, the voltage difference due to the grounding resistance is also small, so that the outlet is incorrectly wired. It is difficult to accurately determine whether or not there is any. Further, when the wiring checker described in Patent Document 2 is used for wiring inspection of a TT grounding type commercial power supply line, the voltage difference due to the grounding resistance is almost eliminated, so it is possible to determine whether there is an incorrect wiring of the outlet. Can not.

  The wiring connection determination device described in Patent Document 3 injects a pulsed voltage signal by interposing a transformer connection portion in the neutral wire pole N, but the neutral wire pole N and the ground wire pole E Since the ground voltage Ve over a wide frequency band is always superimposed on the voltage signal between, the ground voltage Ve from the voltage signal between the neutral wire pole N and the ground wire pole E using a notch filter, a low-pass filter or the like. It is considered difficult to accurately detect the polarity of a single positive / negative pulsed voltage signal injected by neutral transformer N with a transformer connecting portion interposed therebetween. Therefore, even if the wiring connection determination device described in Patent Document 3 is used, it cannot be accurately and accurately determined whether the wiring between the neutral wire electrode N and the ground wire electrode E is correct or reverse.

  Therefore, the present invention has been made in view of such problems, and in the inspection of the wiring connection accompanying new laying work, expansion work, etc., the earth leakage circuit breaker is operated regardless of the type of grounding work. It is another object of the present invention to provide a wiring connection inspection method and a wiring connection inspection system capable of accurately and efficiently determining whether or not the wiring connection is correct.

In order to solve the above-mentioned problem, the invention according to claim 1 is a wiring connection between a proximal end side of a commercial power line including a live wire, a neutral wire, and a ground wire, and an indoor lead-in wiring side of the commercial power line. In the wiring connection inspection method for inspecting the correctness / incorrectness of the test, the test signal generation for generating an AC voltage signal synchronized with a reference clock signal having a frequency different from the frequency of the commercial AC power supply voltage supplied from the commercial power line as the test signal step a, the test signal, the test signal injection step of injecting either one of the neutral line or the ground line at the proximal end side of the commercial power line, said reference clock signal synchronized with the synchronizing clock signal a synchronous clock signal generating step of generating, frequency of the commercial AC power supply voltage from a voltage signal between said ground line and said neutral line in the interior pull wire side Removal of the extraction signal acquisition step of acquiring an extraction signal extracted frequency component based on the test signal, said extracted signal acquired by said extraction signal acquiring step, generated by the synchronization clock signal generation step the polarity of said synchronization clock signal, based on whether they match with the same cycle, the wiring connection determination step of determining correctness of the wiring connection between the ground line and the neutral line, the wiring connection And a test result notifying step for notifying the determination result of the determination step.

In order to solve the above problems, the invention according to claim 2 is a wiring connection between a proximal end side of a commercial power line including a live wire, a neutral wire, and a ground wire, and an indoor lead-in wiring side of the commercial power line. In the wiring connection inspection system for inspecting the right and wrong of the above, the first apparatus comprises a first device used on the base end side of the commercial power line and a second device used on the indoor lead-in wiring side of the commercial power line. as inspection signal an alternating voltage signal synchronized with the reference clock signal of a frequency different from the frequency of the commercial AC power source voltage supplied by the commercial power line, the neutral line or the ground line of the commercial power line A signal injection unit for inspection that injects into one of the two, the second device includes a synchronous clock signal generating unit that generates a synchronous clock signal synchronized with the reference clock signal; From a voltage signal between said ground line and said neutral line in the side by removing the frequency of the commercial AC power supply voltage, and extracting a signal acquiring means for acquiring the extracted signal extracted frequency component based on the test signal the extraction signal and acquired by the extraction signal acquisition unit, the polarity of said synchronization clock signal generated by the synchronizing clock signal generating means, based on whether they match with the same cycle, the neutral line provided with a wire connection determining means for determining correctness of the wiring connection to the ground line, and a test result informing means for informing a result of determination by the wire connection determining means, and
It is characterized by that.

According to a third aspect of the present invention, in the wiring connection inspection system according to the second aspect, the first device includes a reference clock signal output means for outputting a reference clock signal synchronized with the frequency of the reference clock signal. wherein the synchronizing clock signal generating means of said second device, by receiving the reference clock signal is connected to the first device, to generate the synchronous clock signal in synchronization with the reference clock signal, wherein after cutting the first device is characterized in that so as to continue to generate the synchronizing clock signal.

According to a fourth aspect of the present invention, in the wiring connection inspection system according to the second or third aspect, the wiring connection determination unit synchronously rectifies the extraction signal using the synchronous clock signal. Based on comparing a synchronous rectification circuit as a rectification signal, an integration circuit that integrates the rectification signal to generate a DC voltage signal, a measured voltage value by the DC voltage signal, and a predetermined determination reference voltage value Te, characterized in that said neutral line and the determination circuit for determining correctness of the wiring connection to the ground line, in the configuration.

The invention according to claim 5, in the wiring connection inspection system according to claim 4, test signal injection means of the first device, the test signal from the neutral line of the commercial power line and injects the extracted signal acquisition means of the second device, the potential level change of the neutral line with respect to the potential of the ground line is assumed to be obtained as the extraction signal, said second device The synchronous rectifier circuit is a rectified signal from which the positive electrode side or the negative electrode side is removed by half-wave rectification that cuts off the extracted signal when the synchronous clock signal is turned on, and the determination circuit of the second device includes the DC voltage the measured voltage value is determined to be normal to the wiring connection between the ground line and the neutral line is lower than the determination reference voltage value by the signal, the measured voltage value by the DC voltage signal is the-size Characterized in that the wiring connection between the ground line and the neutral line is higher than the reference voltage value was assumed to be determined that an error.

The invention according to claim 6, in claim 2 wiring connection inspection system according to any one of claims 5, lines subject to inspection, and the neutral line of the indoor pull wire side the and the interconnection to the ground line electrode E with outlet grounding line is connected, to the second device, the neutral pole N and the ground line electrode E of the ground line electrode E with the outlet, they are inserted respectively blade Is provided.

The invention according to claim 7, in claim 2 wiring connection inspection system according to any one of claims 6, lines subject to inspection, and the neutral line of the indoor pull wire side the A distribution board to which a ground line is connected is provided, and the second device is provided with a pair of contact terminals that can contact with the wiring in the distribution board.

  According to the wiring connection inspection method and the wiring connection inspection system according to the present invention, it is possible to accurately and accurately determine whether or not the wiring connection is correct without activating the earth leakage circuit breaker regardless of the type of grounding work. It can be done efficiently.

1 is a schematic configuration diagram of a wiring connection inspection system to which a wiring connection inspection method according to the present invention is applied. (A) is explanatory drawing at the time of test | inspecting the commercial power line of the TT grounding system in which 3 lines are correctly connected to the power outlet by a wiring checker. (B) is explanatory drawing at the time of test | inspecting the commercial power line of the TT grounding system in which the neutral wire and the ground wire are erroneously connected to the power outlet by the wiring checker. It is a wave form diagram which shows an example of the test | inspection signal inject | poured into a neutral line or a ground line from the main | base station of a wiring checker. It is a wave form diagram which shows an example of the detection voltage signal which the subunit | mobile_unit of a wiring checker receives from a power outlet. (A) is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the extraction signal S1, and the rectification signal S2 are shown together in the wiring checker applied to the wiring inspection of FIG. FIG. 5B is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the rectified signal S2, and the determination voltage signal S3 are shown together in the wiring checker applied to the wiring inspection of FIG. (A) is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the extraction signal S1, and the rectification signal S2 are shown together in the wiring checker applied to the wiring inspection of FIG. 2 (b). FIG. 6B is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the rectified signal S2, and the determination voltage signal S3 are shown together in the wiring checker applied to the wiring inspection of FIG. (A) is explanatory drawing at the time of test | inspecting the commercial power line of the TN grounding system in which 3 lines are correctly connected to the power outlet by a wiring checker. (B) is explanatory drawing at the time of test | inspecting the commercial power line of the TN grounding system in which the neutral wire and the ground wire are erroneously connected to the power outlet by the wiring checker. FIG. 7A is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the extraction signal S1, and the rectification signal S2 are shown together in the wiring checker applied to the wiring inspection of FIG. FIG. 7B is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the rectified signal S2, and the determination voltage signal S3 in the wiring checker applied to the wiring inspection of FIG. FIG. 7A is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the extracted signal S1, and the rectified signal S2 are shown together in the wiring checker applied to the wiring inspection of FIG. FIG. 7B is a signal waveform diagram in which the time axes of the synchronous clock signal CLK-S, the rectified signal S2, and the determination voltage signal S3 in the wiring checker applied to the wiring inspection of FIG. (A) is explanatory drawing at the time of test | inspecting the commercial power line of the TT grounding system in which 3 lines are correctly connected to the distribution board with a wiring checker. (B) is explanatory drawing at the time of test | inspecting the commercial power line of the TT grounding system in which the neutral wire and the ground wire are misconnected in the distribution board with a wiring checker. (A) is explanatory drawing at the time of test | inspecting the commercial power line of the TN grounding system in which 3 lines are correctly connected to the distribution board with a wiring checker. (B) is explanatory drawing at the time of test | inspecting the commercial power line of the TN grounding system in which the neutral wire and the ground wire are misconnected in the distribution board with a wiring checker.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a wiring connection inspection system to which a wiring connection inspection method is applied.

  The wiring checker 1 constitutes a wiring connection inspection system, and extracts a test signal from a base unit 10 as a first device that injects a test signal from the base end side of the commercial power line and a terminal side of the commercial power line. It consists of the subunit | mobile_unit 20 as a 2nd apparatus. When the wiring connection inspection system according to the present invention is implemented, it is desirable to configure the master unit 10 and the slave unit 20 as separate bodies (including a detachable separation structure) because the locations where they are used are physically separated. . However, it is also possible to use an integrated wiring checker having the functions of the master unit 10 and the slave unit 20 and extending the cable to the inspection signal injection location or the inspection signal extraction location.

  The commercial power line 30 to be inspected by the wiring checker 1 is composed of a live wire 30L and a neutral wire 30N connected to the secondary side of the pole transformer TR, and a ground wire 30E connected to the ground, and is drawn into the house. To the power outlet 40. In the ground line 30E of the commercial power line 30 shown in FIG. 1, for the sake of convenience, the B-type ground resistance, the D-type ground resistance, and the ground resistance therebetween are added together and shown as a ground resistance Re (generally 100Ω or less). Further, a ground voltage Ve of several volts may be generated due to a leakage current of the commercial power line 30 or the like.

  Then, the live wire 30L is connected to the live wire blade receptacle 40L of the power outlet 40 to become the active electrode insertion port L, and the neutral wire 30N is connected to the neutral wire blade receptacle 40N of the power receptacle 40 to be neutral. It becomes the pole insertion port N, and the ground wire 30E is connected to the ground wire blade receptacle 40E of the power outlet 40 and becomes the ground electrode insertion port E. If these connections are made properly, the wiring connection is normal, but if these connections are not made properly, an incorrect connection is made.

  In the wiring checker 1 according to the present embodiment, the wiring connection between the neutral electrode insertion port N and the grounding electrode insertion port E is correct without operating the earth leakage circuit breaker regardless of the type of grounding work. The determination can be performed accurately and accurately. In addition, although the wiring checker 1 of this embodiment shall be equipped only with the wiring connection test | inspection function of the neutral pole insertion port N and the earthing | grounding electrode insertion port E, like the well-known existing wiring checker, the live wire pole L It is good also as a structure provided with the connection determination function also included.

  First, the base unit 10 of the wiring checker 1 includes a CPU 11 that executes various controls and processes, an oscillation circuit 12 that outputs a clock signal to the CPU 11 at a constant frequency, and a reference clock signal CLK− from the clock signal of the oscillation circuit 12. A frequency divider 13 for generating O (configured as a function in the CPU 11) and an AC voltage signal synchronized with the reference clock signal CLK-O is injected as a test signal into either the neutral line 30N or the ground line 30E. A test signal injection means 14 is provided. The reference clock signal CLK-O is a frequency different from the frequency of the commercial AC power supply voltage supplied through the commercial power line 30 and can be easily separated from the commercial AC frequency and its harmonic noise component (for example, 2 .4 kHz) is desirable. Moreover, it is desirable to suppress the inspection signal to a low current that does not operate the leakage breaker so that even the commercial power line 30 provided with the leakage breaker or the like can be inspected in a live line state.

  The inspection signal injection means 14 comprises an injection voltage waveform generation circuit 14a and a transformer connection part 14b. The injection voltage waveform generation circuit 14a outputs an AC voltage signal synchronized with the reference clock signal CLK-O to the transformer connection unit 14b. The transformer connection unit 14b conforms to the injection voltage waveform from the injection voltage waveform generation circuit 14a. The induced signal is generated on the neutral line 30N or the ground line 30E.

  The master unit 10 includes reference clock signal output means 15 that outputs a reference clock signal CLK-R synchronized with the reference clock signal CLK-O, and can output a reference clock signal from the master unit connection terminal 16 to the outside. is there. For example, when the master unit side connector 51 of the connection cable 50 is connected to the master unit connection terminal 16 and the slave unit side connector 52 is connected to the slave unit connection terminal 21 of the slave unit 20, the master unit 10 is connected to the slave unit 10 via the connection cable 50. The reference clock signal CLK-R is supplied to the machine 20.

  On the other hand, the slave unit 20 of the wiring checker 1 includes a CPU 22 that executes control and processing of the slave unit 20, an oscillation circuit 23 that outputs a clock signal having a constant frequency to the CPU 22, and a reference clock signal CLK supplied from the master unit 10. A synchronous clock signal generating means 24 (configured as a function in the CPU 22) that generates a synchronous clock signal CLK-S synchronized with -R, and a neutral pole inlet N and a ground pole outlet E in the power outlet 40 The frequency of the commercial AC power supply voltage is removed from the voltage signal between them, the extraction signal acquisition means 25 for acquiring the extraction signal obtained by extracting the frequency component based on the inspection signal, and the polarity of the extraction signal and the synchronous clock signal are the same cycle Wiring connection determination means 26 for determining the correctness of the wiring connection between the neutral wire 30N and the ground wire 30E based on whether or not they match, and the wiring connection determination method Comprising a test result notification unit 27 for notifying the judgment result by 26.

  The synchronous clock signal generation means 24 includes a frequency divider and a phase comparator, measures the frequency and phase amount of the reference clock signal CLK-R based on the clock signal from the oscillation circuit 23, A synchronous clock signal CLK-S that is synchronized with the reference clock signal CLK-O is generated while being stored in a memory 22a (reusing the storage function in the CPU 22) constituted by an SDRAM or the like.

  The extraction signal acquisition means 25 includes a neutral wire plug blade 251N connected to the neutral wire blade holder 40N of the outlet 40 and a ground wire electrode plug connected to the ground wire blade holder 40E of the outlet 40. The blade 251E is provided, and the neutral line electrode potential and the ground line electrode potential are input via the neutral line electrode potential transmission line 252N and the ground line electrode potential transmission line 252E, respectively. For example, when an inspection signal is injected into the neutral wire 30N, the extraction signal acquisition unit 25 receives a change in the neutral wire electrode potential with reference to the ground wire electrode potential of the ground wire 30E as a detection voltage signal. The extracted signal acquisition means 25 includes a band-pass filter composed of a 6th-order band-pass filter whose center frequency is the frequency of the inspection signal (for example, 2.4 kHz), and detects the commercial AC power supply voltage from the detected voltage signal. The extracted signal obtained by extracting the frequency component based on the inspection signal is acquired.

  The wiring connection determination unit 26 performs synchronous rectification that performs half-wave rectification or full-wave rectification on the extraction signal from the extraction signal acquisition unit 25 based on the synchronization clock signal CLK-S from the synchronization clock signal generation unit 24. A circuit 26a, an integration circuit 26b that integrates a signal from the synchronous rectification circuit 26a into a DC voltage, an A / D conversion circuit 26c that converts the voltage value of the DC voltage from the integration circuit 26b into a digital signal, and A / Based on the measured voltage value from the D conversion circuit 26c and the determination reference voltage value stored in the memory 22a, the wiring to the neutral electrode insertion port N and the ground electrode insertion port E is normal or incorrect. A determination circuit 26d (built in the CPU 22) for determining whether or not there is provided.

  The synchronous rectification circuit 26a has, for example, a half-wave rectification function that blocks the extraction signal in synchronization with the ON of the synchronous clock signal CLK-S. Therefore, if the inspection signal injected into the neutral wire N from the inspection signal injection means 14 of the base unit 10 is correctly received from the neutral electrode pole blade 251N, the extraction signal acquired by the extraction signal acquisition means 25 is obtained. Is the rectified signal cut by the synchronous rectifier circuit 26a. On the other hand, if the inspection signal injected into the neutral wire N from the inspection signal injection means 14 of the main unit 10 is erroneously received by the grounding wire electrode plug blade 251E (the neutral wire 30N and the ground wire 30E are erroneously connected). If so, the polarity of the extraction signal acquired by the extraction signal acquisition means 25 is inverted, so that the negative side becomes a rectified signal cut by the synchronous rectification circuit 26a.

  The integrating circuit 26b integrates the rectified signal half-wave rectified or full-wave rectified by the synchronous rectifier circuit 26a to generate a DC voltage signal. Therefore, if the inspection signal injected into the neutral wire N from the inspection signal injection means 14 of the base unit 10 is correctly received from the neutral wire electrode blade 251N, a negative DC voltage signal is generated by the integrating circuit 26b. Generated. On the other hand, if the inspection signal injected into the neutral wire N from the inspection signal injection means 14 of the main unit 10 is erroneously received by the grounding wire electrode plug blade 251E (the neutral wire 30N and the ground wire 30E are erroneously connected). If so, the integrating circuit 26b generates a positive DC voltage signal.

  The A / D conversion circuit 26c converts the analog DC voltage signal generated by the integration circuit 26b into a digital value at an appropriate sampling frequency. Note that when the full-wave rectification is performed in the synchronous rectifier circuit 26a to determine the polarity of the extracted signal in synchronization with the ON of the synchronous clock signal CLK-S, the absolute value of the DC voltage signal obtained by the integrating circuit 26d. Therefore, the absolute value of the measured voltage value of the DC voltage signal converted into a digital value by the A / D conversion circuit 26c also increases.

  The determination circuit 26d compares the measured voltage value of the DC voltage signal converted by the A / D conversion circuit 26c with a determination reference voltage value (for example, 0 V) stored in the memory 22a, and determines the measured voltage value. When the voltage is lower than the reference voltage value (when a negative DC voltage signal is generated by the integration circuit 26b), the wiring connection between the neutral line N and the ground line E is determined to be normal, and the measured voltage value is determined as the determination reference. When it is higher than the voltage value (when a positive DC voltage signal is generated by the integrating circuit 26b), it is determined that the wiring connection between the neutral line N and the ground line E is an error.

  When the inspection signal is injected into the ground line E by the inspection signal injection means 14 of the main unit 10, if the inspection signal is correctly received from the ground wire pole plug blade 251E, the integration circuit 26b generates a positive DC voltage. If the signal is generated and the inspection signal is erroneously received from the neutral electrode pole blade 251N, a negative DC voltage signal is generated by the integrating circuit 26b. Therefore, the determination circuit 26d determines the measured voltage value. When the voltage is higher than the reference voltage value, the wiring connection between the neutral line N and the ground line E is determined to be normal, and when the measured voltage value is lower than the determination reference voltage value, the wiring between the neutral line N and the ground line E is determined. It is necessary to determine that the connection is incorrect. As described above, whether or not the wiring connection is correct in the determination circuit 26d is not necessarily determined as normal when the measured voltage value is lower than the determination reference voltage value and is determined as incorrect when the measurement voltage value is higher than the determination reference voltage value. Rather, it is necessary to set a correctness / incorrectness determination algorithm in the determination circuit 26d according to the inspection signal injection location, the configuration of the extraction signal acquisition means 25, the synchronous rectification circuit 26a, and the like.

  In the wiring checker 1 of the present embodiment, since the determination circuit 26d is configured by the CPU 22 of the slave unit 20, an A / D conversion circuit 26c is provided to convert the DC voltage signal into a digital value. However, the present invention is not limited to this. For example, if the determination circuit 26d is configured by an analog circuit such as a comparator, the DC voltage signal generated by the integration circuit 26d can be directly input to the determination circuit 26d for use.

  The inspection result notifying means 27 notifies the determination result of the wiring connection by the determination circuit 26d of the wiring connection determining means 26 as the inspection result, such as a visual display device such as a display panel or a lamp, a synthesized voice output function, a buzzer or the like. An audible notification device can be used.

  Next, the determination operation by the wiring checker 1 (the parent device 10 and the child device 20) will be described using a specific example.

  First, before actually determining the wiring state, the master unit 10 and the slave unit 20 are connected by the connection cable 50, and both power switches are turned on. When the power switch is turned on, the base unit 10 generates a reference clock signal CLK-O, and a reference clock CLK-R synchronized with the reference clock CLK-O is supplied to the slave unit 20 via the connection cable 50. In the slave unit 20, the synchronous clock signal generation means 24 determines the frequency and phase amount of the reference clock signal CLK-R (substantially the same clock signal as the reference clock signal CLK-O) from the oscillation circuit 23. Is measured and stored in the memory 22a, and a synchronous clock signal CLK-S is generated.

  After the synchronous clock signal CLK-S is established in the slave unit 20, the connection cable 50 is removed and the master unit 10 and the slave unit 20 are separated. And the transformer connection part 14b of the main | base station 10 is clamped to the base end side wiring of either the neutral line 30N of the commercial power line 30 used as a measuring object, or the ground line 30E. Thereby, an inspection signal (for example, 2.4 kHz) can be injected from the parent device 10 to the neutral wire N or the ground wire E. The master unit 10 does not have a reference clock generation function, and a reference clock is transmitted from a separately provided reference clock generator to the master unit 10 and the slave unit 20 at the same time. The master unit 10 and the slave unit 20 are independently synchronized. A clock signal may be generated and used.

  The commercial power line 30 shown in FIGS. 2 (a) and 2 (b) is a TT grounding system in which the exposed conductive portion of the grounding wire is directly connected to the ground. (System grounding) work is applied, and D-type grounding (equipment grounding) work is applied to the ground pole insertion port E. In the TT grounding type commercial power supply line 30, a grounding resistor Re is interposed between the neutral electrode insertion port N and the grounding electrode insertion port E, and a wide range caused by a leakage current from the power distribution system and the like. The ground voltage Ve over the frequency band is always generated.

  The TT grounding commercial power line 30 is connected to a power outlet 40 via an indoor distribution board 60. For example, the proximal end side live wire 30L connected to the secondary side of the pole transformer TR is connected to the live wire breaker 61L of the distribution board 60 via the indoor lead-in live wire 31L. 30N is connected to the neutral line breaker 61N of the distribution board 60 through the indoor lead-in neutral line 31N, and the ground line 30E is connected to the relay terminal 62 of the distribution board 60 through the indoor lead-in ground line 31E. .

  2A, the other terminal of the live wire breaker 61L is connected to the live wire blade receptacle 40L of the power outlet 40 via the indoor distribution live wire 32L, and the other terminal of the neutral wire breaker 61N is indoors. The neutral wire blade receptacle 40N is connected to the power outlet 40 through the neutral wire 32N for power distribution, and the relay terminal 62 for grounding is connected to the ground wire blade receptacle 40E of the power outlet 40 via the indoor power distribution ground wire 32E. Each is connected. That is, the live wire 30L of the commercial power line 30 is connected to the live wire blade receptacle 40L of the power outlet 40 to become the active electrode insertion port L, and the neutral wire 30N is connected to the neutral wire blade receptacle 40N of the power receptacle 40. Since it is connected to the neutral electrode insertion port N, and the ground wire 30E is connected to the ground wire blade receptacle 40E of the power outlet 40 and becomes the ground electrode insertion port E, it is in an appropriate wiring state.

  On the other hand, in the wiring of FIG. 2B, the other terminal of the live wire breaker 61L is connected to the live wire blade receiver 40L of the power outlet 40 via the indoor power distribution live wire 32L and the other terminal of the neutral wire breaker 61N. Is connected to the ground wire blade receptacle 40E of the power outlet 40 through the neutral wire 32N for indoor distribution, and the relay terminal 62 for grounding is connected to the blade receptacle 40N for the neutral wire of the power outlet 40 via the indoor power distribution ground wire 32E. Are connected to each other. That is, the live wire 30L of the commercial power line 30 is connected to the live wire blade receptacle 40L of the power outlet 40 to become the active electrode insertion port L, while the neutral wire 30N is the ground wire blade receptacle 40E of the power receptacle 40. To the neutral pole insertion port N (the shape and position remains as the grounding electrode insertion port E), and the grounding wire 30E is connected to the neutral wire blade receptacle 40N of the power outlet 40 and plugged into the grounding electrode. Since the opening E (the shape and position remains the ground electrode insertion port N), it is an incorrect wiring state.

  First, the case where the inspection of the commercial power supply line 30 in an appropriate wiring state is performed by the wiring checker 1 will be described with reference to FIG.

  In the TT grounding type commercial power supply line 30, since the inspection signal cannot be injected into the ground line 30E, the inspection signal is injected by the parent device 10 from the neutral line 30N. An example (2.4 kHz) of the inspection signal waveform injected into the neutral wire 30N is shown in FIG. This inspection signal is applied to the power outlet 40, the neutral wire blade blade 251N is connected to the neutral wire blade holder 40N of the indoor outlet 40, and the ground wire electrode is connected to the ground wire blade receptacle 40E of the outlet 40. It is received by the handset 20 to which the plug blade 251E is connected. An example of the voltage signal between NE received by the subunit | mobile_unit 20 is shown in FIG. The reason why such a signal waveform is obtained is that a ground voltage Ve of several volts over a wide frequency band based on the nominal frequency of the power supply is superimposed due to the influence of the ground resistance Re and the leakage current of the power distribution system. .

  When the inspection by the slave unit 20 is started, an unnecessary frequency is first obtained from the voltage signal between NEs obtained from the neutral wire blade receptacle 40N and the ground wire blade receptacle 40E by the extraction signal acquisition means 25 by the extraction signal acquisition means 25. The component is removed, and the extracted signal S1 from which only the frequency band (2.4 kHz) of the inspection signal is extracted is output to the synchronous rectifier circuit 26a of the wiring connection determination unit 26. The synchronous rectification circuit 26a performs rectification processing based on the synchronous clock signal CLK-S, and supplies the rectification signal S2 to the integration circuit 26b.

  FIG. 5A shows an example of a signal waveform in which the time axis of the synchronous clock signal CLK-S, the extracted signal S1, and the rectified signal S2 are written together. Since the extraction signal S1 is distorted more than the inspection signal S1 injected by the parent device 10 due to the influence of the ground resistance Re and the ground voltage Ve, the extraction signal S1 becomes an alternating current synchronized with the on / off of the synchronous clock signal CLK-S. Not. However, as the rectification signal S2, the cycle on the positive electrode side is mainly cut. Further, when this rectification signal S2 is integrated by the integration circuit 26b and converted to a digital value by the A / D conversion circuit 26c, the influence component of the ground voltage Ve that repeats the polarity variation randomly with respect to the synchronous clock signal CLK-S. Can be attenuated and obtained as a DC value (substantially constant negative voltage value) according to the polarity of the inspection signal S1, as in the determination voltage signal S3 shown in FIG.

  The determination voltage signal S3 obtained as described above is compared with a predetermined determination reference voltage value (for example, 0 V) by the determination circuit 26d, and the value of the determination voltage signal S3 is greater than the determination reference voltage value. Since the wiring is low, the wiring connection is normal (the neutral wire 30N is connected to the blade receptacle 40N for the neutral wire of the power outlet 40 and becomes the neutral electrode socket N, and the ground wire 30E is the ground of the power outlet 40. It is determined that the wiring is connected to the wire blade receiver 40E and is the ground electrode insertion port E). Then, the determination result is notified to the inspectors by the inspection result notification means 27.

  Next, the case where the wiring power checker 1 inspects the commercial power supply line 30 in an incorrect wiring state will be described with reference to FIG.

  Even in the mis-wired commercial power supply line 30, when inspection by the slave unit 20 is started, the extraction signal acquisition unit 25 causes the power outlet 40 neutral wire blade receiver 40N and the ground wire blade receiver 40E to NE. An intermediate voltage signal can be obtained, but the neutral wire 30N is connected to the ground wire blade receptacle 40E of the power outlet 40 to become a grounding electrode outlet E, and the ground wire 30E is for the neutral wire of the power outlet 40 Since the neutral pole insertion port N is connected to the blade receiver 40N, a voltage signal having a polarity opposite to that of the inspection signal injected from the master unit 10 is detected.

  Therefore, the extraction signal acquisition unit 25 removes unnecessary frequency components from the NE voltage signal and extracts only the frequency band (2.4 kHz) of the inspection signal. When the rectification process is performed at 26a, as shown in FIG. 6A, the rectification signal S2 is mainly cut in the negative cycle. For this reason, when the rectification signal S2 is integrated by the integration circuit 26b and converted to a digital value by the A / D conversion circuit 26c, a substantially constant positive voltage is obtained as in the determination voltage signal S3 shown in FIG. Obtained as a value.

  The determination voltage signal S3 obtained as described above is compared with a predetermined determination reference voltage value (for example, 0 V) by the determination circuit 26d, and the value of the determination voltage signal S3 is greater than the determination reference voltage value. Due to the high wiring connection error (the neutral wire 30N is connected to the ground wire blade receptacle 40E of the power outlet 40 and becomes the grounding electrode outlet E, and the ground wire 30E is the neutral wire of the power outlet 40) The wiring state is a neutral pole insertion port N connected to the blade receiver 40N. Then, the determination result is notified to the inspectors by the inspection result notification means 27.

  The commercial power supply line 30 described above is a TT grounding method, but the wiring inspection by the wiring checker 1 according to the present embodiment can be applied to other grounding power supply lines. For example, as shown in FIG. 7 (a), a grounding system (hereinafter referred to as T-) in which the neutral electrode insertion port N and the grounding electrode insertion port E are grouped together at the common ground electrode on the base end side. This is also applicable to the case of N grounding). In the case of the TN grounding commercial power supply line 30 ', the neutral wire 30N and the ground wire 30E have substantially the same potential, but a ground voltage Ve of several millivolts may be superimposed due to the resistance component of the wire itself.

  The TN grounding type commercial power supply line 30 ′ is connected to the power outlet 40 through the indoor distribution board 60. For example, the proximal end side live wire 30L connected to the secondary side of the pole transformer TR is connected to the live wire breaker 61L of the distribution board 60 via the indoor lead-in live wire 31L. 30N is connected to the neutral line breaker 61N of the distribution board 60 through the indoor lead-in neutral line 31N, and the ground line 30E is connected to the relay terminal 62 of the distribution board 60 through the indoor lead-in ground line 31E. .

  In the wiring of FIG. 7A, the other terminal of the live wire breaker 61L is connected to the live wire blade receptacle 40L of the power outlet 40 via the indoor distribution live wire 32L, and the other terminal of the neutral wire breaker 61N is indoors. The neutral wire blade receptacle 40N is connected to the power outlet 40 through the neutral wire 32N for power distribution, and the relay terminal 62 for grounding is connected to the ground wire blade receptacle 40E of the power outlet 40 via the indoor power distribution ground wire 32E. Each is connected. That is, the live wire 30L of the commercial power line 30 ′ is connected to the live wire blade receptacle 40L of the power outlet 40 to become the active electrode insertion port L, and the neutral wire 30N is the neutral wire blade receptacle 40N of the power outlet 40. To the neutral electrode insertion port N, and the ground wire 30E is connected to the ground wire blade receptacle 40E of the power outlet 40 to become the ground electrode insertion port E, so that the wiring is in an appropriate state.

  On the other hand, in the wiring of FIG. 7B, the other terminal of the live wire breaker 61L is connected to the live wire blade receptacle 40L of the power outlet 40 via the indoor power distribution live wire 32L and the other terminal of the neutral wire breaker 61N. Is connected to the ground wire blade receptacle 40E of the power outlet 40 through the neutral wire 32N for indoor distribution, and the relay terminal 62 for grounding is connected to the blade receptacle 40N for the neutral wire of the power outlet 40 via the indoor power distribution ground wire 32E. Are connected to each other. That is, the live wire 30L of the commercial power line 30 ′ is connected to the live wire blade receptacle 40L of the power outlet 40 to become the active electrode insertion port L, while the neutral wire 30N is the ground wire blade receptacle of the power receptacle 40. 40E is connected to the neutral pole insertion port N (the shape and position remains the grounding electrode insertion port E), and the grounding wire 30E is connected to the blade receptacle 40N for the neutral wire of the power outlet 40 and is connected to the grounding pole difference. Since it becomes the insertion port E (the shape and the position remain as the ground electrode insertion port N), it is an incorrect wiring state.

  First, the case where the inspection of the commercial power supply line 30 ′ in an appropriate wiring state is performed by the wiring checker 1 will be described with reference to FIG.

  In the TN grounding type commercial power supply line 30 ′, the inspection signal is injected by the parent machine 10 from either the neutral line 30 N or the ground line 30 E. In this example, an inspection signal is injected from the neutral wire 30N. This inspection signal is applied to the power outlet 40, the neutral wire blade blade 251N is connected to the neutral wire blade holder 40N of the indoor outlet 40, and the ground wire electrode is connected to the ground wire blade receptacle 40E of the outlet 40. It is received by the handset 20 to which the plug blade 251E is connected.

  When the inspection by the slave unit 20 is started, an unnecessary frequency is first obtained from the voltage signal between NEs obtained from the neutral wire blade receptacle 40N and the ground wire blade receptacle 40E by the extraction signal acquisition means 25 by the extraction signal acquisition means 25. The component is removed, and the extracted signal S1 from which only the frequency band (2.4 kHz) of the inspection signal is extracted is output to the synchronous rectifier circuit 26a of the wiring connection determination unit 26. The synchronous rectification circuit 26a performs rectification processing based on the synchronous clock signal CLK-S, and supplies the rectification signal S2 to the integration circuit 26b.

  FIG. 8A shows an example of a signal waveform in which the time axis of the synchronous clock signal CLK-S, the extracted signal S1, and the rectified signal S2 are written together. The extracted signal S1 has an AC waveform in a cycle synchronized with the on / off of the synchronous clock signal CLK-S, and only the positive cycle is cut as the rectified signal S2. Therefore, when this rectification signal S2 is integrated by the integration circuit 26b and converted to a digital value by the A / D conversion circuit 26c, a substantially constant negative voltage is obtained as in the determination voltage signal S3 shown in FIG. Obtained as a value.

  The determination voltage signal S3 obtained as described above is compared with a predetermined determination reference voltage value (for example, 0 V) by the determination circuit 26d, and the value of the determination voltage signal S3 is greater than the determination reference voltage value. Since the wiring is low, the wiring connection is normal (the neutral wire 30N is connected to the blade receptacle 40N for the neutral wire of the power outlet 40 and becomes the neutral electrode socket N, and the ground wire 30E is the ground of the power outlet 40. It is determined that the wiring is connected to the wire blade receiver 40E and is the ground electrode insertion port E). Then, the determination result is notified to the inspectors by the inspection result notification means 27.

  Next, the case where the inspection of the commercial power supply line 30 ′ in the wrong wiring state is performed by the wiring checker 1 will be described with reference to FIG.

  Even in the miswired commercial power supply line 30 ', when the inspection by the slave unit 20 is started, the extracted signal acquisition means 25 causes the power receptacle 40 to receive the neutral wire blade receiver 40N and the ground wire blade receiver 40E from the N- Although the voltage signal between E can be obtained, the neutral wire 30N is connected to the ground wire blade receptacle 40E of the power outlet 40 to become a grounding electrode outlet E, and the ground wire 30E is the neutral wire of the power outlet 40 Since the neutral pole insertion port N is connected to the blade receiver 40N, a voltage signal having a polarity opposite to that of the inspection signal injected from the master unit 10 is detected.

  Therefore, the extraction signal acquisition unit 25 removes unnecessary frequency components from the NE voltage signal and extracts only the frequency band (2.4 kHz) of the inspection signal. When the rectification process is performed at 26a, as shown in FIG. 9A, only the cycle on the negative electrode side of the rectification signal S2 is cut. For this reason, when the rectification signal S2 is integrated by the integration circuit 26b and converted into a digital value by the A / D conversion circuit 26c, a substantially constant positive voltage is obtained as in the determination voltage signal S3 shown in FIG. Obtained as a value.

  The determination voltage signal S3 obtained as described above is compared with a predetermined determination reference voltage value (for example, 0 V) by the determination circuit 26d, and the value of the determination voltage signal S3 is greater than the determination reference voltage value. Due to the high wiring connection error (the neutral wire 30N is connected to the ground wire blade receptacle 40E of the power outlet 40 and becomes the grounding electrode outlet E, and the ground wire 30E is the neutral wire of the power outlet 40) The wiring state is a neutral pole insertion port N connected to the blade receiver 40N. Then, the determination result is notified to the inspectors by the inspection result notification means 27.

  As described above, the wiring checker 1 according to the present embodiment can be installed in the distribution board 60 regardless of the TT grounding type commercial power supply line 30 or the TN grounding type commercial power supply line 30 ′. Without activating the earth leakage breaker (neutral wire breaker 61N), it is possible to accurately and accurately determine the correctness of wiring connection. In the wiring checker 1 of the present embodiment, most of the measurement circuits in the parent device 10 and the child device 20 are configured by analog circuits, but each circuit configuration may be replaced with a digital circuit. I do not care.

  In addition, since the subunit | mobile_unit 20 in the wiring checker 1 of embodiment mentioned above is provided with the plug blade 251N for neutral wire poles and the plug blade 251E for ground wire electrodes for connecting to the power outlet 40, commercial power supply It is impossible to know where the miswiring is between the base end side of the lines 30 and 30 ′ and the power outlet 40.

  Therefore, the cordless handset 20 ′ shown in FIGS. 10A and 10B and FIGS. 11A and 11B is provided with a neutral wire contact terminal 281N and a ground wire contact terminal 281E, and is being retracted indoors. The N-E voltage is acquired at any location (for example, a connection location within the distribution board 60) of the neutral wire 31N, the neutral wire 32N for indoor distribution, the indoor lead-in ground wire 31E, or the indoor distribution ground wire 32E. Enabled wiring inspection. For the neutral wire contact terminal 281N and the ground wire contact terminal 281E as a pair of contact terminals provided in the slave unit 20 ', ready-made products such as a test probe and a test clip can be used. Further, the neutral wire contact terminal 281N and the ground wire contact terminal 281E supply the voltage signal of the contact location to the extraction signal acquisition means 25 of the slave unit 20 'via the lead wires 282N and 282E, respectively.

  First, since the TT grounding type commercial power supply line 30 shown in FIG. 10 (a) is an appropriate wiring, a distribution board is formed by the neutral line contact terminal 281N and the ground line contact terminal 281E of the slave 20 '. When the N-E voltage is acquired from the indoor power distribution neutral line 32N and the indoor power distribution ground line 32E and the inspection is performed, the determination voltage signal S3 becomes a negative voltage value from the determination reference voltage value. Therefore, the wiring connection is normal (the neutral wire 30N on the proximal end side is connected to the breaker 61N for the neutral wire on the electrical panel 60 through the indoor lead-in neutral wire 31N, and the ground wire on the proximal end side is connected. 30E is determined to be a wiring state connected to the relay terminal 62 of the distribution board 60 via the indoor lead-in ground line 31E.

  As shown in the commercial power line 30 in FIG. 2B described above, the neutral wire 32N for indoor power distribution is connected to the ground wire blade receptacle 40E of the power outlet 40, so that the neutral pole insertion port N (shape and shape) The position becomes the grounding electrode insertion port E), and the grounding wire 32E for indoor distribution is connected to the blade receptacle 40N for the neutral wire of the power outlet 40, and the grounding electrode insertion port E (the shape and position is the insertion of the grounding electrode) Even in the case of miswiring that remains at the mouth N), the slave unit 20 ′ obtains the NE voltage from the indoor power distribution neutral line 32N and the indoor power distribution ground line 32E in the distribution board 60 and inspects them. If done, the wiring state is determined to be normal. That is, it is possible to clarify that there is no wiring error in the power supply line on the base end side from the inspection point where the neutral wire contact terminal 281N and the ground wire contact terminal 281E are in contact with each other. Therefore, if the inspection at the power outlet 40 performed by the slave unit 20 is an erroneous connection determination and the inspection at the distribution board 60 performed by the slave unit 20 ′ is a normal connection determination, the distribution panel 60 and the power outlet 40 are connected. Since it is possible to specify that there is an incorrect wiring between the two, the correction work to the appropriate wiring can be performed efficiently.

  On the other hand, the TT grounding type commercial power supply line 30 shown in FIG. 10B is miswired, and the neutral wire 30N on the base end side is connected to the relay terminal of the distribution board 60 through the indoor lead-in neutral wire 31N. 62, the ground line 30E is connected to the neutral line breaker 61N of the distribution board 60 through the indoor lead-in ground line 31E. For this reason, the indoor distribution line connected from the neutral line breaker 61N of the distribution board 60 to the power outlet 40 becomes the indoor distribution ground line 32E, and is connected to the neutral line blade receptacle 40N of the power outlet 40 and grounded. It becomes a pole insertion port E (the shape and position remain the ground electrode insertion port N). Similarly, the indoor distribution line connected from the relay terminal 62 of the distribution board 60 to the power outlet 40 becomes a neutral line 32N for indoor distribution and is connected to the contact terminal 281E for the ground line of the power outlet 40 so as to have a neutral difference. It becomes a slot N (the shape and position remain as the ground pole outlet E).

  Accordingly, when the mis-wired commercial power supply line 30 shown in FIG. 10B is inspected by the slave unit 20 ', the neutral wire contact terminal 281N is connected to the indoor power distribution ground wire 32E (the outlet side of the neutral wire breaker 61N). The ground wire contact terminal 281E is brought into contact with the indoor power distribution neutral wire 32N (the outlet side indoor power distribution wire of the relay terminal 62), respectively, and the voltage between NE is extracted. The extracted signal S1 extracted by the signal acquisition means 25 has a polarity opposite to that of the waveform at the time of normal connection. For this reason, since the determination voltage signal S3 is a positive voltage value and higher than the determination reference voltage value, the wiring connection state can be determined to be abnormal.

  Thus, if it is a subunit | mobile_unit 20 'provided with a pair of contact terminal, since a wiring connection test | inspection can be performed in arbitrary places other than the power outlet 40, it is based on the inside of the distribution board 60 or the distribution board 60 rather than. Even if there is an incorrect wiring on the end side, it can be accurately determined and becomes highly useful. In addition, it is good also as a subunit | mobile_unit provided with the contact plug-shaped contact terminal which can be connected to the power outlet 40 with the contact terminal which can be connected to arbitrary places.

  Further, similarly to the slave unit 20 in the wiring checker 1 of the above-described embodiment, the wiring connection determination by the slave unit 20 'can be applied to the TN grounding commercial power line 30'. For example, as shown in FIG. 11A, if the connection in the distribution board 60 is normal, the neutral wire contact terminal 281N is connected to the indoor power supply neutral wire 32N (the outlet side indoors of the neutral wire breaker 61N). Since the ground wire contact terminal 281E is in contact with the indoor power distribution ground wire 32E (the outlet side indoor power distribution wire of the relay terminal 62), the extracted signal S1 extracted by the extracted signal acquisition means 25 is normal. Since the waveform at the time of connection is obtained and the determination voltage signal S3 is a negative voltage value and is lower than the determination reference voltage value, the wiring connection state can be determined to be normal.

  On the other hand, as shown in FIG. 11 (b), the neutral wire 30N on the proximal end side is connected to the relay terminal 62 of the distribution board 60 through the indoor lead-in neutral wire 31N, and the ground wire 30E is passed through the indoor lead-in ground wire 31E. If the neutral distribution breaker 61N is erroneously connected to the distribution board 60, the indoor distribution line connected from the neutral line breaker 61N to the power outlet 40 becomes the indoor distribution ground line 32E, and the relay terminal The indoor distribution line connected from 62 to the power outlet 40 is a neutral line 32N for indoor distribution. Therefore, when inspecting with the subunit | mobile_unit 20 ', the neutral wire contact terminal 281N is used for the indoor power distribution grounding wire 32E (the indoor power distribution wire on the outlet side of the neutral wire breaker 61N), and the ground wire contact terminal 281E is used for the indoor power distribution. Each of the neutral wires 32N (the outlet side indoor distribution line of the relay terminal 62) is brought into contact with each other to acquire the NE voltage, and the extraction signal S1 extracted by the extraction signal acquisition means 25 is the normal connection. Therefore, the determination voltage signal S3 has a positive voltage value and is higher than the determination reference voltage value, so that the wiring connection state can be determined to be abnormal.

  That is, the wiring checker using the slave unit 20 ′ having a pair of contact terminals can be used not only for the TT grounding type commercial power supply line 30 but also for the TN grounding type commercial power supply line 30 ′. It can be used.

  As mentioned above, although the embodiment of the wiring connection inspection system to which the wiring connection inspection method according to the present invention is applied has been described based on the accompanying drawings, the present invention is not limited to these embodiments, and As long as the configuration described in (1) is not changed, the known equivalent technical means may be diverted.

1 Wiring checker 10 Master unit (first device)
14 Inspection signal injection means 20 Slave unit (second device)
24 Synchronized clock signal generating means 25 Extracted signal obtaining means 26 Wiring connection determining means 27 Inspection result notifying means 30 Commercial power line (TT grounding method)
40 Power outlet

Claims (7)

In the wiring connection inspection method for inspecting the correctness of the wiring connection between the proximal end side of the commercial power line including the live electric wire, the neutral line and the ground line, and the indoor power wiring side of the commercial power line,
A test signal generating step for generating an AC voltage signal synchronized with a reference clock signal having a frequency different from the frequency of the commercial AC power supply voltage supplied by the commercial power line as a test signal;
The test signal, the test signal injection step of injecting either one of the neutral line or the ground line at the proximal end side of the commercial power line,
A synchronous clock signal generating step for generating a synchronous clock signal synchronized with the reference clock signal;
Extracting said from said voltage signal between said ground line and said neutral line in Indoor retracted wiring side by removing the frequency of the commercial AC power source voltage, to obtain an extracted signal extracted frequency component based on the test signal A signal acquisition step;
Said extraction signal obtained by said extraction signal acquiring step, the polarity of said synchronization clock signal generated by the synchronization clock signal generation step, based on whether they match with the same cycle, the neutral a wiring connection determination step of determining correctness of the wiring connection of the line and said ground line,
An inspection result notification step for notifying the determination result of the wiring connection determination step;
Wiring connection inspection method characterized by performing. In the wiring connection inspection system for inspecting the correctness of the wiring connection between the proximal end side of the commercial power line including the live wire, the neutral wire and the grounding wire, and the indoor lead-in wiring side of the commercial power line,
A first device used on the base end side of the commercial power line, and a second device used on the indoor lead-in wiring side of the commercial power line,
The first device, the inspection signal an alternating voltage signal synchronized with the reference clock signal of a frequency different from the frequency of the commercial AC power source voltage supplied by the commercial power line, the neutral line of the commercial power line or comprising a test signal injection means for injecting to either of the ground line,
The second device includes:
Synchronous clock signal generating means for generating a synchronous clock signal synchronized with the reference clock signal;
Extracting said from said voltage signal between said ground line and said neutral line in Indoor retracted wiring side by removing the frequency of the commercial AC power source voltage, to obtain an extracted signal extracted frequency component based on the test signal A signal acquisition means;
Said extraction signal and acquired by the extraction signal acquisition unit, the polarity of said synchronization clock signal generated by the synchronizing clock signal generating means, based on whether they match with the same cycle, and the neutral line a wire connection determining means for determining correctness of the wiring connection to the ground line,
Inspection result notifying means for notifying the determination result by the wiring connection determining means,
Comprising
Wiring connection inspection system characterized by that. The first device comprises reference clock signal output means for outputting a reference clock signal synchronized with the frequency of the reference clock signal,
The synchronization clock signal generation means of said second device, by receiving the reference clock signal is connected to the first device, in synchronization to the reference clock signal to generate the synchronizing clock signal, the first 3. The wiring connection inspection system according to claim 2, wherein the synchronous clock signal is continuously generated even after the apparatus is disconnected. The wiring connection determination means includes
A synchronous rectification circuit that rectifies the extracted signal by synchronous rectification using the synchronous clock signal;
An integrating circuit that integrates the rectified signal to generate a DC voltage signal;
A measured voltage value by the DC voltage signal, the predetermined based on the comparing the determination reference voltage value, determination circuit correctness of the wiring connection between the ground line and the neutral line,
The wiring connection inspection system according to claim 2, wherein the wiring connection inspection system is configured as described above. Test signal injection means of the first device is intended to inject the test signal from the neutral line of the commercial power line,
It said extraction signal acquisition means of said second device is intended to obtain the potential level change of the neutral line with respect to the potential of the ground line as the extraction signal,
The synchronous rectifier circuit of the second device, the half-wave rectification for blocking the extraction signal during on of the synchronous clock signal, it is assumed that the rectified signal positive side or the negative electrode side have been removed,
The determination circuit of the second device, the above determination wire connecting the normal and the ground line and the neutral line when the measured voltage value by the DC voltage signal is lower than the determination reference voltage value, the DC according to claim 4, characterized in that said measured voltage value by the voltage signal was assumed to determine an error of the wiring connection between the ground line and the neutral line is higher than the determination reference voltage value Wiring connection inspection system. Wiring subjects inspected is to said interior pull wire side of the neutral line and the connection wiring of the to the ground line electrode E with outlet grounding line is connected,
Wherein the second device, the neutral pole N and the ground line electrode E of the ground line electrode E power outlet, one of claims 2 to 5, characterized in that a plug pins to be inserted respectively The wiring connection inspection system according to item 1. Wiring object inspected has a distribution board in which the ground line and the neutral line of the indoor pull wire side is connected,
The wiring connection inspection system according to any one of claims 2 to 6, wherein the second device is provided with a pair of contact terminals that can come into contact with the wiring in the distribution board.

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