JP3209080B2 - Amplifying device for distribution line carrier signal and distribution line carrier system using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line carrier signal amplifying apparatus suitable for long-distance transmission of a signal in a distribution line carrier system using a distribution line as a signal transmission line, and a distribution system using the same. Electric wire transport system.

[0002]

2. Description of the Related Art As one form of utilization of a distribution line conveying system, there is a system in which a control signal for opening and closing a switch installed in the middle of a distribution line is conveyed. That is,
A plurality of power supply systems from the substation to a certain destination are provided, and even if a certain system fails, power can be reliably supplied to the destination by using another system. In order to determine a system to be used, a switch is provided at an appropriate position of a distribution line constituting the system, and by closing a contact of a predetermined switch, power can be supplied using an arbitrary system.

[0003] An example of such a distribution line transport system is as follows.
As shown in FIG. 5, a switch 4 is inserted in the middle of, for example, a 6600 V distribution line 3 connected to a transformer 2 in a substation 1. In the illustrated example, the distribution line 3 is 1
Although only a book, that is, one system connected in series is described, a plurality of systems are provided in parallel or branched from an appropriate position. The switch 4 includes various types such as a switch having an ON / OFF switch function for opening and closing a normal contact and a switch having a switching function.

[0004] In the former case, for example, a switch mounted on one system to be used is mounted on each of a plurality of systems constructed by arranging distribution lines in parallel, and the other systems are closed. Open the switch mounted on the. In the latter case, a plurality of systems can be connected to the downstream side of the switch, and the system to be used is connected to the upstream side. In any case, when a failure occurs in the system currently being used, the switching state of the switch is switched to supply power through another system.

Here, in the distribution line transport system, a controller 5 for controlling the opening and closing of the switch 4 is connected to the distribution line 3 so as to straddle the switch 4. At this time, 66
Since a high voltage of 00 V flows, the distribution line 3 is connected via a coupler 6 for extracting a carrier wave as a control signal therefrom.
Connect to

[0006] A control signal for the control unit 5 is sent from a master station 7 installed in the substation 1. That is, the master station 7 is also connected to the distribution line 3 via the coupler 8. Then, a signal (carrier) of, for example, about 10 W is output from the master station 7, injected between the distribution line 3 and the ground via the coupler 8, and taken out via the coupler 6 by the controller 5. Has become.

In the above system configuration, since the control unit 5 is connected so as to straddle the switch 4, even if the contact of the switch 4 is open, the signal from the master station 7 is
It is transmitted to the downstream side via the controller 5. Controller 5
In addition to the opening / closing control of the switch 4 described above, there is no role of monitoring the surrounding state such as the presence / absence of a failure and transmitting the state to the master station 7 side, and two-way communication is performed.

[0008]

However, the above-mentioned conventional system has the following problems.
The carrier signal transmitted via the distribution line 3 is more specific according to physical conditions such as the type and diameter of the line used for the distribution line 3 and the inductance caused by the capacity and line length between the distribution line and the ground. Although the characteristics are different, they attenuate as the transmission distance increases.

[0009] On the other hand, as the distribution equipment becomes more automated, labor-saving or unmanned, the transmission distance of signals, such as transmission and reception between mountainous areas and plains, tends to be longer. As a result, the attenuation of the signal level increases, and there is a possibility that the signal cannot be received normally. Further, when the signal level is reduced in such a manner, the signal level is easily affected by external noise and the like, and the S / N ratio is deteriorated. Therefore, normal signal transmission cannot be performed, and reception may not be possible. In particular, in the case of a high-voltage distribution line, since the voltage is as high as 6600 V,
The above problem becomes significant because the influence of noise cannot be ignored and also the effect of standing waves.

[0010] Further, as another utilization form of the distribution line transport system, there is a centralized management of the WHM of the customer as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-203566.
This is to read the WHM weighing values, respectively, and to convey the read data to a central control center via a low-voltage distribution line. Also in this system, when the transmission distance becomes longer, the carrier signal is attenuated, so that there is a disadvantage that the system can be applied only in a limited service area. In order to solve this, in the invention disclosed in the above publication, two A step repeater was implemented.

In the two-stage repeater, the received signal is once received by the receiver, demodulated into code data (for example, JIS code), and stored in the memory. After a certain period of time, the transmission unit reads out the data stored in the memory, modulates the data and injects a carrier signal of a predetermined level into the low-voltage distribution line. Further, the receiving unit, the transmitting unit, and the memory are operated using electric power (100 V) transmitted through the low-voltage distribution line.

Such a two-stage relay device is preferable because the transmission distance is longer than that of the conventional system and a service in a wide area is possible. However, each time data is transmitted, demodulation and modulation processing must be performed in each two-stage relay device, and data must be read from and written to the memory, which complicates the processing. In addition, since a transmitting device is provided in each two-stage relay device, the size of the system is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has as its object to solve the above-described problems and to use a simple configuration and an algorithm without using an independent transmission function. And a distribution line carrier signal amplifying device that enables long-distance transmission and a distribution line carrier system using the same.

[0014]

In order to achieve the above object, a distribution line carrier signal amplifying apparatus according to the present invention is used in a distribution line carrier system using a distribution line as a signal transmission path. An amplifying device mounted at a predetermined position in a road and amplifying a signal level of the signal, a first delay unit connected in series to the distribution line, and a direction in which the first delay unit carries the signal. A first path from the upstream side to the signal adding means, a second path from the downstream side of the first delay means in the signal carrying direction to the signal adding means, and an output from the signal adding means. There is a third route to the distribution line on the downstream side in the signal transport direction.

The first path is provided with a coupler for extracting at least the signal flowing through the distribution line, and a second delay unit for delaying the signal extracted by the coupler. Further, a coupler for extracting at least the signal flowing through the distribution line is provided in the second path. Further, the third path is provided with an amplifying means for amplifying at least a signal level output from the signal adding means, and a coupler for injecting the amplified signal into the distribution line (claim 1). .

Another solution is an amplifying device used in a distribution line transport system using a distribution line as a signal transmission line, mounted at a predetermined position in the transmission line and amplifying the signal level of the signal. A first delay unit connected in series to the distribution line; a first path from one end of the first delay unit to a signal adding unit;
A second path from the other end of the delay means to the signal addition means, and a third path from the output of the signal addition means to both ends of the first delay means.

The first path and the second path each include a coupler for extracting at least the signal flowing through the distribution line, and a second delay unit for delaying the signal extracted by the coupler. , A switch for enabling the second delay means to be short-circuited. The third path may be made conductive with one of both ends of the first delay means by the switching means, and amplify the signal level output from the signal adding means in the middle thereof. And a coupling for injecting the amplified signal into the distribution line.

Preferably, the apparatus further comprises transport direction detecting means for detecting a transport direction of the signal, and the switch and the switching means are operated based on a detection result of the transport direction detector. Item 3).

With this configuration, a signal flowing in the same forward direction as the transport direction reaches the signal adder through the first path, and then passes through the second delay means to delay the phase by a predetermined amount. . Further, the phase of the signal reaching the signal adder via the second path is delayed when passing through the first delay means. When the phase delays are equal, the signals are combined without attenuating by the signal adding means, and the signal level is amplified by the next-stage amplifier, and then re-injected into the distribution line. This enables long-distance transmission.

On the other hand, for the signal in the reverse direction, the signal reaching the signal adder through the first path passes through the first and second delay means, but passes through the second path to the signal adder. The incoming signal does not pass through the delay means. Therefore, the signal passing through both paths is out of phase, and is attenuated by the signal adder. In particular, assuming that the phase delay in each delay means is π / 2 radians, the phase difference between the two signals in the signal adder is π radians, and is completely canceled.

According to the second aspect of the present invention, it is possible to cope with the case where the signal carrying direction is different by switching the switch. That is, the switch connected to the second delay element existing on the upstream side in the transport direction is opened, and the switch connected to the second delay element existing on the downstream side is closed. Further, in the third path, the amplified signal is injected to the downstream side by the switching means. Then
Since the circuit configuration is the same as that of the first aspect, the signal can be amplified and transmitted to the downstream side.

According to the third aspect of the present invention, the switching of the switches can be performed automatically, so that when two-way communication of signals is performed using the same power distribution line, a single amplifying device can transmit and receive signals in both directions. Can be amplified.

In the embodiments corresponding to the second and third aspects (first and second embodiments), the third path is formed by a single wiring from the signal adder to the amplifier, and the third path is connected to the amplifier. Although the output is branched into two paths, the present invention is not limited to this. The output of the signal adder may be branched into two paths, and an amplifier may be installed in each path. Also,
As a switching means, in the embodiment, two switches S
3, S4 is used, but this may also be realized using a single changeover switch.

On the other hand, in the distribution line transport system according to the present invention, the distribution line is used as a signal transmission path, and at least one of the control signal of the control device for the switching device of the system wiring and the state of the control device is provided.
4. A distribution line transport system for transmitting a signal related to one of the following:
The amplifier for a distribution line carrier signal described in the paragraph is mounted so that the signal transmitted through the distribution line is amplified before reaching a non-receivable level (claim 4).

With this configuration, when using a predetermined system among a plurality of systems for supplying electric power, even if it is a switch (a switch in the embodiment) installed in a remote place, it is ensured. Opening and closing control and the state of a controller installed at a remote location can be reliably transmitted to the center.

[0026]

FIG. 1 shows a first embodiment of a distribution line carrier signal amplifying apparatus according to the present invention. As shown in FIG. 1, the amplification device 10 includes a pair of input / output terminals 11 connectable to the distribution line 3, and one end of each of high-voltage internal wires 12 is connected between the input / output terminals 11. A delay element (first delay means) 13 is connected to the other end of the wiring 12. Thereby, when the extension device 10 is inserted into the distribution line 3, the delay element 13 intervenes in series, for example, 66
The high voltage of 00V and the carrier signal pass through the internal wiring 12 and the delay element 13. Therefore, the internal wiring 12
It is formed using the same thing as the distribution line 3. That is,
The internal wiring 12 has a function equivalent to that of the distribution line 3 in an actual distribution line transport system. Injecting a signal into the internal wiring 12 is equivalent to injecting into the distribution line 3. Taking a signal from the distribution line 12
Is equivalent to capturing a signal from

First couplers 15a and 15b which take in signals carried in distribution line 3 (internal wiring 12) for internal wirings 12 connected to both sides of delay element 13, respectively.
And a second signal injection into the distribution line 3 (internal wiring 12) side.
Couplers 16a and 16b are connected. Each coupler 15a,
15b, 16a, and 16b can be the same as the high voltage coupler 6 for the slave station connected to the controller 5 described in the related art.

One end of each of the delay elements 17a and 17b is connected to each of the first couplers 15a and 15b, and the other end of each of the delay elements 17a and 17b is connected to a level adjuster 18.
a and 18b are connected to a signal adder 19.
In this example, the delay element 13 connected in series to the internal wiring 12 and the two delay elements 17a and 17b arranged in a path branched therefrom are elements that delay by π / 2 radians by passing through. (Such as a coil). Further, the level adjusters 18a and 18b adjust the levels so that the amplitudes of the signals input to the signal adder 19 through the respective paths become equal.

Switches S1 and S2 for short-circuiting the delay elements 17a and 17b are connected between both terminals of the delay elements 17a and 17b. The switches S1 and S2 open and close in conjunction with each other, so that the contact of one switch is open and the contact of the other switch is closed. Then, the switch on the delay element side located on the upstream side with respect to the direction of the carrier wave is set to the open state.

Therefore, for example, when the carrier wave flows from left to right as shown in FIG.
1 is open, and the downstream switch S2 is closed.
Thus, the signal captured via the first coupler 15a is delayed by passing through the delay element 17a, but the signal captured via the first coupler 15b on the downstream side is switched by the switch S2. Therefore, the delay element 17b is bypassed and is not delayed.

The output of the signal adder 19 is
And the output of the amplifier 20 is connected to switches S3 and S3.
4 to the second couplers 16a and 16b. And these two switches S3, S
4 also operates in the same manner as the switches S1 and S2 connected to the delay elements 17a and 17b, and the switch on the second coupler side located upstream with respect to the direction of the carrier wave is opened, and the downstream side is opened. The switch on the side is closed.

That is, the four switches S1 to S4 operate mechanically or electrically in conjunction with each other, and the open / close state of the contacts of each switch is the same as the state shown in FIG. The state can be taken. In this example, the two states are manually switched based on pressing of a switch (not shown).

Next, the operation of the above embodiment will be described. First, the direction of the carrier wave passing through the distribution line 3 is set from left to right in the figure. Then, the signal flowing through the distribution line 3 (the internal wiring 12) is extracted by the first coupler 15a on the upstream side and passes through the delay element 17a, so that the phase is delayed by π / 2 radians, and further, the level is adjusted. After passing through 18a and adjusting the signal level, it is input to the signal adder 19.

On the other hand, the carrier passing through the internal wiring 12 is
By passing through the delay element 13 as it is, the phase becomes π.
/ 2 radians delayed. Then, the delayed signal is captured via the first coupler 15b on the downstream side. Then
The fetched signal passes through the switch S2 and does not pass through the delay element 17b, but is supplied to the level adjuster 18b with the phase delayed by the delay element 13, where the signal level is adjusted. Input to the device 19.

In the signal adder 19, the first combiner 15
a, the signal passing through the delay element 17, the level adjuster 18a, the delay element 13, the first coupler 15b, and the switch S
2, the signal that has passed through the level adjuster 18b is added. Since both signals have the same phase with a phase delay of π / 2 radians, the signals are added (combined) without attenuating as they are, and It is amplified by the stage amplifier 20.

The signal thus amplified passes through the switch S4 in the closed state, and passes through the second coupler 16 on the downstream side.
b is injected into the internal wiring (distribution line 3) side. By the way, some of the injected signals flow toward the downstream side in the forward direction (direction A), and others flow toward the upstream side in the reverse direction (direction B). The signal flowing in the direction A is transmitted further downstream as a normal control signal. At this time, the signal that has passed through the delay element 13 (not amplified) is superimposed. However, since the level of the signal that has not been amplified is attenuated and becomes very small, the second coupling is performed. Cancellation by the amplified signal injected from the unit 16b. Therefore, the amplified signal of the predetermined level is output from the amplification device 10.

The signal flowing in the direction B, which is the reverse direction, passes through the first coupler 15b, the switch S2, the level adjuster 18b, reaches the signal adder 19, and further passes through the delay element 13 as it is. After passing, the first coupler 15a,
Some reach the signal adder 19 through the delay element 17a and the level adjuster 18a. Considering the phases of the signals passing through these two paths, the former does not delay the phase, and the latter delays π radians by passing through the two delay elements 13 and 17a. That is, the phase difference between the two signals passing through both paths is π radian. And
Since both signals pass through the level adjusters 18a and 18b, their level-adjusted amplitudes are equal.
The signal is canceled by the signal adder 19.

Therefore, the amplified signal injected from the second coupler 16b advances only in the forward direction A, and does not flow backward. Further, according to the same principle, even if there is a return signal due to reflection or the like, the amplification processing is not performed in the amplification device 10 and the signal as it is (the phase is delayed by π / 2 by passing through the delay element 13) advances. Is attenuated according to the distance. And the place where the amplification device 10 is installed is
Since the signal level is attenuated unless it is installed for long-distance transmission and cannot be received by the other party, the backflow signal that is not amplified is attenuated as it is, and the probability of returning to the transmitting side is suppressed as much as possible.

By switching the switches S1 to S4,
If it is reversed from the state shown in the figure, the amplification device can perform an amplification process on a carrier wave flowing from right to left in the figure.
In the present embodiment, the switches are manually switched, and the installation location of each amplifying device 10 is located away from the substation, so that the transport direction is determined in advance in one direction. It is suitable for implementation in such systems. That is, for example, the present invention can be applied to a system in which a control signal is always transmitted from a master station to a slave station, and a feedback signal indicating whether or not the slave station has received a signal is not returned to the master station.

In general, information is transmitted in both directions. In such a case, a distribution line to be used is changed (a different distribution line is used, and one direction signal flows through one distribution line). ). Furthermore, since the signal in the opposite direction is not amplified, the signal transmitted from the master station to each controller is installed at a location away from the substation, and conversely, the substation is By installing a signal at a nearby location to amplify a signal transmitted from the controller to the master station, it is possible to cope with bidirectional communication using the same distribution line.

Further, if the switches S1 to S4 can be switched based on an external signal,
If it is desired to amplify a signal whose transport direction is opposite for some reason after installation, a control signal may be issued from a remote location (for example, a master station) and the switch may be switched based on the control signal. In such a case, it is preferable that the switch be operated electrically such as an electromagnetic switch. Signals for switching the switches may be transmitted using the distribution line transport system, or other communication systems such as telephone lines may be used, and various methods can be adopted.

FIG. 2 shows an example of a preferred embodiment of the distribution line conveying system according to the present invention. As shown in the figure, the amplification device 10 having the above-described configuration is inserted and arranged at a predetermined position of the distribution line 3. Then, the arrangement position is an arbitrary position before the level of the signal to be transmitted is attenuated and reaches a level at which reception is impossible. The same components as those in the related art are denoted by the same reference numerals. Further, the distribution line carrier relay device 21 in FIG. 2 is different from the delay elements 17a, 17b,
This corresponds to a circuit configuration including the level adjusters 18a and 18b, the signal adder 19, the amplifier 20, and the switches S1 to S4. As is apparent from a comparison between FIG. 2 and FIG. 5, in the present invention, except for the addition of the amplification device 10, the equipment of the conventional distribution line transport system can be used as it is.
This is preferable because no new equipment improvement is required.

FIG. 3 shows a second embodiment of the amplifying device according to the present invention. In this embodiment, the structure of the above-described first embodiment is used as a basic configuration, and switches S1 to S1 are used.
The switching of S4 is automatically switched according to the transport direction flowing through the distribution line 3. In particular,
The transport direction detecting unit 25 is connected to the first couplers 15a and 15b, and the output of the transport direction detecting unit 25 is connected to the switch switching unit 26. Then, based on the detection result of the transport direction detecting unit 25, the switch switching unit 26 is operated to set the open / close state of each of the switches S1 to S4 to a state suitable for the transport direction.

More specifically, the transport direction detecting section 25
Detects the capture of the signal into each of the first couplers 15a and 15b, and determines which one has been captured first. Then, the side taken in earlier is determined to be upstream. In the present system, the carrier is transmitted in half-duplex in both directions, so that signals in both directions are not transmitted at the same time. Therefore, the carrier direction can be reliably detected by the above determination method.

Further, as described above, the switch switching section 26 switches the switch to the correct open / closed state based on the result of determination of the transport direction. That is, when the carrier is being transported from left to right in FIG. 3, the state shown in the figure is set, and when the carrier is being transported in the opposite direction, the open / close state of each switch is reversed. To Specifically, for example, when each switch is of an electromagnetic type, a current in a predetermined direction is supplied to a coil attached to each switch to switch a contact. When each switch is a mechanical switch, a lever connected to the switch is moved via a predetermined actuator.

Since the other constructions and functions and effects are the same as those of the first embodiment, the same reference numerals are given and the detailed description is omitted. It goes without saying that the amplifying device of this embodiment can be mounted on the system shown in FIG.

FIG. 3 shows a third embodiment of the amplifying device according to the present invention. As shown in the figure, in the present embodiment, a switching mechanism by a switch is removed from the structure of the first embodiment.

That is, this corresponds to the case where the carrier wave flows from the left side in the figure. In such a case, the second coupler 16a on the upstream side shown in FIG. And no signal flows. Therefore, the coupler 16a and the switch S3 have been eliminated. Further, since it is necessary to always supply a signal to the delay element 17a connected to the first coupler 15a on the upstream side, the switch S1 for bypassing the signal is removed.

Further, the first coupler 15b on the downstream side
No signal flows through the delay element 15b connected to
It was also removed. Since the switches S2 and S4 are always closed, the switches are also removed and are directly connected by wiring.

Thus, a circuit configuration as shown in FIG. 4 is obtained. In such a configuration, when the direction of the carrier wave is from left to right, the signal in that direction can be amplified and the signal in the opposite direction is not amplified by the same operation principle as in the above-described embodiments. Demonstrates the function as a device.

Therefore, in the case where the carrier direction of the carrier wave to be amplified is one direction, and the switching process is not necessary after the installation in order to cope with the reverse carrier direction, the amplifying device of the present embodiment can be used. it can. The present embodiment is preferable in that the structure is simple and has an amplification function equivalent to that of each of the embodiments, so that it is small and inexpensive.

Since the other constructions and functions and effects are the same as those of the above-described embodiments, the same reference numerals are given.
A detailed description thereof will be omitted. It goes without saying that the amplifying device of this embodiment can be mounted on the system shown in FIG.

Also, as an application example of the amplifier according to the present invention, an example in which a control signal for switching a distribution line system is amplified has been described. However, the present invention is not limited to this, and long-distance transmission is required. It can be applied to various distribution line transport systems.

[0054]

As described above, in the present invention, the signal in the forward direction can be amplified as it is by delaying the phase of the signal, and the signal in the reverse direction can be attenuated and canceled by shifting the phase. Therefore, the signal level can be set to a predetermined value by a simple configuration and algorithm without using an independent transmission function, and long-distance transmission can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of an amplifier for distribution line carrier signals according to the present invention.
It is a figure showing an embodiment.

FIG. 2 is a diagram showing an example of an embodiment of a distribution line transport system according to the present invention.

FIG. 3 shows a second embodiment of the distribution line carrier signal amplifying apparatus according to the present invention.
It is a figure showing an embodiment.

FIG. 4 shows a third embodiment of the distribution line carrier signal amplifying apparatus according to the present invention.
It is a figure showing an embodiment.

FIG. 5 is a diagram showing an example of a conventional distribution line transport system.

[Explanation of symbols]

 Reference Signs List 3 distribution line 13 delay element (first delay means) 15a, 15b first coupler 16a 16b second coupler 17a, 17b delay element (second delay means) 19 signal adder 20 amplifier S1, S2 switch S3, S4 switch (switching means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 3/50-3/60

Claims (4)

(57) [Claims] 1. An amplifying device that is used in a distribution line transport system using a distribution line as a signal transmission line and is mounted at a predetermined position in the transmission line and amplifies the signal level of the signal, wherein the distribution line A first delay unit connected in series to the first delay unit, a first path from the upstream side of the signal transmission direction of the first delay unit to the signal addition unit, and a transmission of the signal of the first delay unit. A second path from the downstream side to the signal addition means, and a third path from the output of the signal addition means to the distribution line on the downstream side in the signal transfer direction, and the first path includes A coupler for extracting at least the signal flowing through the distribution line; and a second delay unit for delaying the signal extracted by the coupler. The second path includes at least the signal flowing through the distribution line. Take out combiner Amplifying means for amplifying at least the signal level output from the signal adding means, and a coupler for injecting the amplified signal into the distribution line. Amplifier for distribution line carrier signal. 2. An amplifying device that is used in a distribution line transport system using a distribution line as a signal transmission line and is mounted at a predetermined position in the transmission line and amplifies a signal level of the signal. A first delay means connected in series to the first delay means, a first path from one end of the first delay means to the signal addition means, and a second path from the other end of the first delay means to the signal addition means. And a third path extending from an output of the signal addition means to both ends of the first delay means. The first path and the second path each include at least the distribution line. And a second delay means for delaying the signal extracted by the coupler, and a switch capable of short-circuiting the second delay means. The first means by the switching means While being able to conduct with either of both ends of the delay means,
An amplifying device for a distribution line carrier signal, comprising an amplifying unit for amplifying a signal level output from the signal adding unit and a coupling for injecting the amplified signal into the distribution line. 3. The apparatus according to claim 2, further comprising a transport direction detecting means for detecting a transport direction of the signal, wherein the switch and the switching means are operated based on a detection result of the transport direction detecting means. Item 3. An amplifier for distribution line carrier signals according to Item 2. 4. A distribution line transporting system for transmitting a control signal of a control device for a switch of a system wiring and a signal relating to at least one of states of the control device, wherein the distribution line is a signal transmission path, The distribution line carrier signal amplifying device according to any one of claims 1 to 3 is mounted at a position, and the signal transmitted through the distribution line is amplified before reaching a non-receivable level. And distribution line transport system.