JP2014027809A - Slave station for automatic voltage regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slave station for an automatic voltage regulator, capable of continuing its operation as a voltage relay even if a lightning surge breaks a communication function.SOLUTION: The slave station for an automatic voltage regulator includes: a communication circuit board 23 electrically connected with a remote control cable 19; a control circuit board 27 having a function that remote controls an automatic voltage regulator body 3 on the basis of a remote control signal from a communication circuit and a function that controls the automatic voltage regulator body 3 by autonomous operation in the absence of the remote control signal; and a power supply, all of which are stored in a storage case 21. The power supply includes a power supply 25 for communication circuit and a power supply 29 for control circuit configured to be electrically insulated, respectively, and the communication circuit board 23 and the control circuit board 27 are connected to be mutually communicable in an electrically insulated state.

Description

  The present invention relates to an automatic voltage adjustment slave station for remotely controlling an automatic voltage regulator.

  A control device for controlling the automatic voltage regulator is mainly composed of a voltage relay and a remote control station for providing the control device with a remote control communication function. Conventionally, since the size of the voltage relay is large, it is difficult to store the voltage relay and the remote control station together in the storage case of the control device. It was set aside outside.

  In view of this, development for integrating a telescoping station into a control device and integrating it has been in progress (for example, JP-A-8-205248 [Patent Document 1], etc.). The inventors have reduced the number of parts by reducing the number of components by reducing the number of components to one with a voltage relay and a remote control station control microcomputer, while having the functions of a voltage relay and a remote control station, An attempt was made to develop an automatic voltage regulator slave station of the same size.

JP-A-8-205248

  However, in the automatic voltage regulator slave station having the functions of a voltage relay and a remote control station, a communication line (distance control cable) is inserted in the control device in order to provide the function of the remote control station having a communication function. It is necessary to let When a communication line is inserted, it becomes easy to draw a surge current (lightning surge) caused by lightning, and the surge current may cause the voltage relay to malfunction or damage the communication system equipment. In particular, when the communication circuit for realizing the function of the remote control station or the power supply for the communication circuit is damaged by the lightning surge, there arises a problem that the automatic voltage regulator slave station stops operating as a whole.

  An object of the present invention is to provide an automatic voltage regulator slave station that can continue to operate as a voltage relay even if a communication function fails due to a lightning surge.

  The present invention relates to a communication circuit board on which electronic components constituting a communication circuit that is electrically connected to a distance control cable and transmits / receives a signal for remotely controlling an automatic voltage regulator are mounted. A control circuit board on which electronic components constituting a control circuit having a function of remotely controlling an automatic voltage regulator based on a remote control signal and a function of controlling the automatic voltage regulator by autonomous operation when there is no remote control signal; The present invention is directed to an automatic voltage regulator slave station that includes a power source that supplies power for operating the communication circuit board and the control circuit board, and a storage case that stores the communication circuit board, the control circuit board, and the power source.

  The automatic voltage regulator slave station according to the present invention is configured such that the power source is divided into a communication circuit power source for the communication circuit and a control circuit power source for the control circuit, which are electrically insulated from each other. Further, the communication circuit board and the control circuit board are connected to each other so as to be able to communicate with each other in an electrically insulated state and are stored in the storage case. With this configuration, even if a lightning surge enters through the distance control cable, no surge current is transmitted from the communication circuit board to the control circuit board. Further, since the power source is divided into the communication circuit power source and the control circuit power source, no surge current is transmitted to the control circuit power source. Therefore, the control circuit board and the power supply for the control circuit are not affected by the lightning surge, and even if the communication circuit board and / or the power supply for the communication circuit are damaged by the lightning surge, Control of the regulator can be continued.

  A means for electrically insulating the communication circuit board and the control circuit board is arbitrary. If an isolator is used, the communication circuit board and the control circuit board can be connected via the isolator so as to communicate with each other in an electrically insulated state. For example, a digital isolator or a photocoupler can be used as the isolator.

  When a communication circuit board is damaged by a lightning surge, a mounted element is destroyed and fragments are scattered, which may damage the control circuit board and / or the power supply for the control circuit. In particular, when a lightning arrester is mounted on a communication circuit board, the lightning arrester is likely to burst and scatter. Therefore, it is conceivable to physically insulate the communication circuit board, the control circuit board, and the power supply circuit board on which the communication circuit power supply and the control circuit power supply are mounted through the partition walls in the storage case. . If comprised in this way, not only can a control circuit board and a power supply for control circuits be electrically insulated, but both can also be physically insulated, and the reliability with respect to a lightning surge can be improved more. A lightning arrester may be arranged on the communication circuit board, and an isolator may be arranged on the communication circuit board or the control circuit board.

  Specifically, the above-described partition wall provided in the storage case includes a horizontal wall portion that extends in the horizontal direction and divides the space in the storage case vertically and a vertical wall portion that bisects the space above the horizontal wall portion in the left and right directions. Can be configured. The communication circuit board can be fixed to one wall surface of the vertical wall portion, the control circuit board can be fixed to the other wall surface of the vertical wall portion, and the power circuit board can be accommodated in the space below the horizontal wall portion. If comprised in this way, each structural member can be accommodated in a storage case compactly, physically insulating a communication circuit board and another structural member.

It is a block diagram which shows the structure of the automatic voltage regulator control apparatus provided with the subunit | mobile_unit for automatic voltage regulators of this Embodiment, and an automatic voltage regulator. It is a schematic front view of the state which abbreviate | omitted the operation panel of the subunit | mobile_unit for automatic voltage regulators of this Embodiment. It is a schematic side view of the slave station for automatic voltage regulators of this Embodiment. It is a schematic plan view of the slave station for automatic voltage regulators of this Embodiment.

  Embodiments of a slave station for an automatic voltage regulator according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an automatic voltage regulator control device and an automatic voltage regulator provided with a slave station for an automatic voltage regulator according to the present embodiment.

[Configuration of automatic voltage regulator]
The automatic voltage regulator 1 includes an automatic voltage regulator body 3 and an automatic voltage regulator control device 5. The automatic voltage regulator main body 3 compensates for the voltage drop of the secondary distribution line based on the signal from the automatic voltage regulator control device 5 to improve the voltage fluctuation. In the automatic voltage regulator main body 3, a tap switching transformer 7 in which a primary side and a secondary side distribution line are connected to a primary side and a secondary side, respectively, and a secondary side WU line voltage are detected. An instrument transformer Tr and an instrument current transformer CT for detecting a W-phase-U-phase combined current.

  The automatic voltage regulator control device 5 is a device that controls the automatic voltage regulator body 3 based on the measured value of the distribution line, and is mainly composed of the voltage regulator 9. The voltage regulator 9 includes a control / communication unit 11 that performs control based on the measured value of the distribution line, and an auxiliary relay unit 13 that outputs a tap switching signal to the tap switching transformer 7. The automatic voltage regulator slave station that is the subject of the present invention relates to the internal structure of the control / communication unit 11. The control / communication unit 11 is connected to an automatic-manual control circuit switch 43A and a remote-direct control circuit switch 43R. In addition, a voltage measurement terminal PTT connected to the instrument transformer Tr via the relay terminal block 15 and a current measurement terminal CTT connected to the instrument current transformer CT are provided, and the voltage of the secondary distribution line is provided. Value and current value are input. The control / communication unit 11 outputs to the auxiliary relay unit 13 a command for controlling tap switching based on the voltage value and current value of the distribution line. A distance control cable 19 is connected to the control / communication unit 11 via the connection terminal block 17, and a command for receiving a control signal from a remote location and controlling the switching of the tap to the auxiliary relay unit 13 is provided. Can also be output.

[Configuration of slave station for automatic voltage regulator]
2 to 4 are schematic diagrams showing an outline of the configuration of the automatic voltage regulator slave station (control / communication unit 11) of the present embodiment. In FIG. 2, the operation panel arranged in the front is omitted. In FIG. 4, the constituent members hidden behind the upper surface plate are indicated by dotted lines. As shown in FIG. 2 to FIG. 4, the automatic voltage regulator slave station of the present embodiment mainly includes a storage case 21 that stores each component, a communication circuit board 23, a communication circuit power supply 25, It is composed of a control circuit board 27 and a control circuit power supply 29.

<Storage case>
The storage case 21 is configured by combining a metal frame 22 forming an outer frame of a hexahedron and a partition wall, and has a shape that can be stored in the voltage regulator 9. That is, the surface other than the front surface on which the operation panel is installed, the upper surface having the upper surface plate 20 provided with the vertical wall portion described later, and the bottom surface having the bottom wall portion is only the metal frame 22, and the voltage regulator 9. If the automatic voltage regulator slave station installed in is taken out, the internal circuit board can be immediately accessed. The partition wall extends in the horizontal direction and divides the space in the storage case 21 vertically in the plane of FIG. 2, and the vertical wall section 33 bisects the space above the lateral wall 31 in the plane of FIG. It consists of. The right space formed by the vertical wall portion 33 is a communication circuit board space 35, the left space is a control circuit board space 37, and the lower space formed by the horizontal wall portion 31 is a power source space 39.

<Communication circuit>
The communication circuit board 23 is electrically connected to the distance control cable 19 shown in FIG. 1, and transmits and receives signals for remotely controlling the automatic voltage regulator 1 (specifically, the automatic voltage regulator body 3). An electronic component (not shown) that constitutes the communication circuit 24 is mounted. The distance control cable 19 is connected to a communication circuit on the communication circuit board 23 via a lightning arrester 41 provided on the communication circuit board 23. The communication circuit board 23 is fixed to the vertical wall portion 33 via a spacer 43 and is accommodated in the communication circuit board space 35. Power for operation of the communication circuit board 23 is supplied from a communication circuit power supply 25 connected by a power supply line 45. The communication circuit board 23 is connected to the control circuit board 27 by a digital data communication line 47. The digital data communication line 47 is connected through a through hole 49 provided in the upper part of the vertical partition wall 33. The communication circuit 24 is controlled by a control microcomputer 51 (described later) provided on the control circuit board 27 via a digital data communication line 47.

<Control circuit>
The control circuit board 27 has a function of remotely controlling the automatic voltage regulator 1 (specifically, the automatic voltage regulator body 3) based on a remote control signal from the communication circuit 24, and autonomously when there is no remote control signal. An electronic component (not shown) constituting the control circuit (relay circuit) 28 having a function of controlling the automatic voltage regulator main body 3 by operation and a control microcomputer 51 are mounted. The control microcomputer 51 has both the control function of the control circuit 28 and the control function of the communication circuit 24. The digital data communication line 47 extending from the communication circuit board 23 is connected to the control circuit board 27 via the digital isolator 53, and the communication circuit board 23 and the control circuit board 27 are electrically insulated. Thus, it is configured to be able to transmit and receive signals. The control circuit board 27 is fixed to the vertical wall portion 33 via a spacer 55 and is accommodated in the control circuit board space 37. The communication circuit board 23 and the control circuit board 27 are installed in a back-to-back state with the vertical wall portion 33 interposed therebetween. Power for operation of the control circuit board 27 is supplied from a control circuit power supply 29 connected by a power supply line 57.

<Power supply>
The communication circuit power supply 25 and the control circuit power supply 29 are provided on one substrate, but are provided at a certain interval with respect to each other, and both are electrically insulated. The power supply circuit board 30 on which the communication circuit power supply 25 and the control circuit power supply 29 are mounted is fixed to the bottom wall portion 61 of the storage case 21 via the spacer 59 and stored in the power supply space 39.

  The automatic voltage regulator slave station (control / communication unit 11) arranged and configured as described above is connected in a state where the communication circuit board 23 and the control circuit board 27 are electrically insulated by the digital isolator 53. . Further, the power source is divided into a communication circuit power source 25 and a control circuit power source 29, and both are electrically insulated. Furthermore, the communication circuit board 23, the control circuit board 27, the communication circuit power supply 25, and the control circuit power supply 29 are arranged in a state of being physically insulated by the partition wall including the horizontal wall portion 31 and the vertical wall portion 33. . With such a configuration, even when a lightning surge enters through the distance control cable 19, the surge current does not enter the control circuit board 27 and the control circuit power supply 29 by the digital isolator 53. Further, even if the lightning arrester 41 or the like is physically destroyed and the fragments are scattered, the expansion of the scattering is suppressed by the presence of the partition walls (31, 33), so that the control circuit board 27 and the control circuit power supply 29 are damaged. Not receive. Therefore, even if the communication circuit board 23 and / or the communication circuit power supply 25 is destroyed by a lightning surge, the control of the automatic voltage regulator body 3 can be continued by the autonomous operation function of the control circuit.

  In addition, when the communication circuit board 23 and / or the communication circuit power supply 25 are destroyed by a lightning surge, it is necessary to repair them immediately. Therefore, it is desirable that an error display be made on the distance control side when communication through the distance control cable 19 is interrupted. In the present embodiment, at the time of repair, only the failed communication circuit board 23 and / or communication circuit power supply 25 need to be replaced, so that repair can be performed at low cost.

  According to the present invention, the communication circuit board and the control circuit board are connected in an electrically insulated state. Further, the power source is divided into two power sources for the communication circuit and the power source for the control circuit, and is electrically insulated. Further, the communication circuit board, the control circuit board, the communication circuit power supply, and the control circuit power supply are arranged in a state of being physically insulated by the partition wall. Therefore, even if a lightning surge enters through a distance control cable and the communication circuit board and / or power supply for the communication circuit is destroyed, the control of the automatic voltage regulator body is continued by the autonomous operation function of the control circuit. Thus, a highly reliable automatic voltage regulator slave station can be obtained.

DESCRIPTION OF SYMBOLS 1 Automatic voltage regulator 3 Automatic voltage regulator main body 5 Automatic voltage regulator controller 7 Tap change transformer 9 Voltage regulator 11 Control / communication unit 13 Auxiliary relay unit 15 Relay terminal block 17 Connection terminal block 19 Distance control cable 21 Storing Case 22 Metal frame 23 Communication circuit board 24 Communication circuit 25 Power supply for communication circuit 27 Control circuit board 28 Control circuit 29 Power supply for control circuit 30 Power supply circuit board 31 Horizontal wall part 33 Vertical wall part 35 Communication circuit board space 37 For control circuit board Space 39 Power supply space 41 Lightning arrester 43 Spacer 45 Power line 47 Digital data communication line 49 Through hole 51 Control microcomputer 53 Digital isolator 55 Spacer 57 Power line 59 Spacer 61 Bottom wall

Claims (5)

A communication circuit board that is electrically connected to a distance control cable and on which electronic components constituting a communication circuit for transmitting and receiving signals for remotely controlling the automatic voltage regulator are mounted;
Electronic components constituting a control circuit having a function of remotely controlling an automatic voltage regulator based on a remote control signal from the communication circuit and a function of controlling the automatic voltage regulator by autonomous operation when there is no remote control signal are mounted A control circuit board,
A power supply for supplying power for operation of the communication circuit board and the control circuit board;
An automatic voltage regulator slave station comprising a storage case for storing the communication circuit board, the control circuit board, and the power source,
The power source is configured to be configured to be electrically insulated from each other, a communication circuit power source for the communication circuit, and a control circuit power source for the control circuit,
A slave station for an automatic voltage regulator, wherein the communication circuit board and the control circuit board are communicably connected to each other in an electrically insulated state and housed in the housing case.   The slave station for an automatic voltage regulator according to claim 1, wherein the communication circuit board and the control circuit board are connected so as to be able to communicate with each other in an electrically insulated state via an isolator.   In the storage case, the communication circuit board, the control circuit board, and the power supply circuit board on which the power supply for the communication circuit and the power supply for the control circuit are mounted are physically insulated through partition walls, respectively. The slave station for an automatic voltage regulator according to claim 1. The partition wall is composed of a horizontal wall portion that extends horizontally and bisects the space in the storage case up and down, and a vertical wall portion that bisects the space above the horizontal wall portion in the left and right directions,
The communication circuit board is fixed to one wall surface of the vertical wall portion,
The control circuit board is fixed to the other wall surface of the vertical wall portion,
The slave station for an automatic voltage regulator according to claim 3, wherein the power circuit board is accommodated in a space below the lateral wall portion. A lightning arrester is disposed on the communication circuit board,
The isolator that is communicably connected to each other in an electrically insulated state via the communication circuit board and the control circuit board is disposed on the communication circuit board or the control circuit board. 4. The automatic voltage regulator slave station according to 4.

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