JPH0984266A - Bi-directional automatic voltage regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bi-directional automatic voltage regulator which makes it possible to regulate a distribution line voltage in the same way forwarding a power by automatically detecting the reverse time of time of the power flow and uninteruptibly switching the power to be supplied to an on-load voltage regulator. SOLUTION: An on-load tap changer 9 is switched to the tap 8a of the through position of an auto-transformer 7 by the control signal 9a from a controller 11a according to the detection signal for detecting the reverse of a power flow by a reverse-current relay 11 to set all the stationary contactor 3 and movable contactor 4 of a tap selector 6 connected to a distribution line to the same potential. The contactor 4 is rotatably driven by a control signal 6a, the connection of the distribution line connected to the contactor 3 is automatically switched uninterruptibly and by non-arcing, the directions of the input and output of the distribution line to an on-load voltage regulator 16 are switched to make it possible to regulate the distribution line voltage even in both cases of forwarding and reversing the power flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load voltage regulator connected to a distribution line, which automatically detects the forward and reverse directions of the power flow of the distribution line, and even in the case of reverse transmission, the power is corrected without interruption. The present invention relates to a bidirectional automatic voltage adjustment device that can adjust the voltage of a distribution line in the same manner as during transmission.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory view of a form of a distribution line, FIGS. 8 and 9 are explanatory views of a switching system of a conventional load voltage regulator, FIG. 8 is a switch, and FIG. It is a principal part block diagram of the switching system by a tap. As a voltage stabilization measure for the distribution system, install a load voltage regulator in the middle of the distribution line, and switch the taps provided on the transformer that constitutes this load voltage regulator with the load tap changer. Compensates for voltage fluctuations on the distribution line. The configuration of the distribution line where the voltage regulator during load is installed is often a tree-like configuration, and the main branches have a complicated shape because they form a normally open loop with the adjacent feeder. The configuration is basically as shown in FIG. That is, the distribution line is formed in the above-described normally open loop in which the switch 17a is opened, and the sections 18a to 18d are formed by the distribution substations 14a and 14b.
In order to adjust the voltage of the distribution line in the sections 18e to 18h, the on-load voltage regulators 16a and 16b are respectively installed to supply power to the respective branch lines.

By the way, the distribution line 18 shown in FIG.
When a line failure or a work power failure occurs at h, the switch 1 is provided to stop the power transmission of the substation 14b that is supplying power.
The section from 18e to 18h where 7a is opened is in a power failure state. At this time, in order to supply electric power from the above-mentioned power failure section 18e to 18g, the switch 1 in the failure section 1
By opening 7b and turning on the switch 17a, power is transmitted from the substation 14a to the above-described power outage section, and the power outage range of the distribution line is minimized.

By the way, the direction of the power flow 15a transmitted from the substation 14a is opposite to the direction of the power flow 15b transmitted from the substation 14b before the failure. Therefore, the direction of the power flow flowing to the load voltage regulator 16b provided for adjusting the voltage of the distribution line from the section 18e to 18h is in the reverse direction, so that the load voltage regulator 16b
In b, it becomes difficult to properly adjust and maintain the voltage.

For this reason, as shown in FIG. 8, switches 17c, 17c are connected in series before and after the load voltage regulator 16c, and the load voltage regulator 16c and the switch 17c are opened and closed in parallel. As a circuit configuration for connecting the switches 17d and 17d, the switches 17c and 17c are provided when the power flow direction is forward.
And switch 17d and 17d are opened,
When the direction of the power flow is in the backward direction, the switch 17c,
17c is opened, the transmission voltage of the distribution line is temporarily cut off, and then the switches 17d, 17d are turned on, and the power flow direction to be input to the load voltage regulator 16 is the same direction as in the above-described normal transmission. As a result, it is possible to adjust the voltage of the distribution line by the load voltage regulator 16c in both cases of forward and reverse power flow.

Further, in the system shown in FIG. 9, the autotransformer 7 of the load voltage regulator 16d is provided with dedicated taps 8 for forward and reverse power flow, respectively, and a load tap changer is provided for forward power transfer. The voltage of the distribution line is adjusted by switching the forward feed taps 8a to 8e at 9, and the current transformer 10 provided on the distribution line
When the reverse feed is detected by the detection signal of the reverse current relay 11 which detects the reverse feed of the electric power flow by obtaining the phase difference of the current measured in step 1, the load tap changer 9 turns the reverse feed taps 8a and 8f to 8i. The voltage is adjusted by switching.

[0007]

However, in the method shown in FIG. 8 described above, during forward / backward power flow,
Since the automatic switching of the switches 17c, 17c and 17d, 17d is complicated, the switching work must be done manually at the site, and there is a case where the work of temporarily interrupting the distribution line is involved and the work takes a long time. In addition to the above, there is a problem in that the above-described switch mounting columns are complicated and the installation work and operation thereof are difficult. In addition, FIG.
In the system shown in Fig. 2, it is necessary to provide the autotransformer 7 of the load voltage regulator with the dedicated taps 8 for forward and reverse power flow as described above. There is a problem that the vessel becomes larger.

An object of the present invention is to solve the above-mentioned problems, to automatically detect the reverse flow of power flow, and to switch the power flowing into the load voltage regulator without interruption to determine which power flow. It is an object of the present invention to provide a bidirectional automatic voltage regulator which can regulate the voltage of the distribution line even in the case of the direction.

[0009]

In order to solve the above-mentioned problems, the present invention uses a reverse current relay provided on a distribution line or a line of a transformer of a load voltage regulator connected to the distribution line. The forward and backward and forward directions of the power flow of the electric wire are detected, and the input / output direction of the distribution line connected to the load voltage regulator is determined by the contact of each stator connected to the input / output side of the distribution line. Between the child and each fixed contactor connected to the input / output side of the voltage regulator during load is switched by the movable contactor in an open circuit state by uninterrupted switching by the tap selector to forward or reverse the power flow. In either case, it is possible to adjust the voltage of the distribution line by the load voltage regulator.
As a result, even if a reverse power flow flows into the load voltage regulator, the distribution line can be automatically switched without power failure and the voltage can be adjusted in the same way as during normal power transfer without interruption. A compact, lightweight bidirectional automatic voltage regulator that does not require a power supply can be obtained. Also, when sending back the power flow,
Fix the tap of the transformer of the load voltage regulator to the plain position and set each fixed contact and movable contact on the distribution line side and the load voltage regulator side to the same potential to fix each Since the contacts can be switched between without interruption and without arcing, the reliability of the tap selector can be increased.

Further, a tap selector for switching between input and output to the load voltage regulator is provided, and each fixed contact connected to the input / output side of the distribution line and the load voltage regulator side is equally spaced on the circumference. Is installed on the insulating plate, and the movable contactor, which is divided into two rotatable parts, keeps the energized state between the fixed contactors on the distribution line side and the load voltage regulator side, and slides them while bridging each other. By adopting a configuration that makes dynamic contact, a small and lightweight tap selector that can significantly reduce the work of switching the distribution line to the load voltage regulator during forward and reverse transmission of the power flow described above. Obtainable.

Further, the movable contactor of the tap selector is driven by the Geneva mechanism to perform a switching operation by intermittently rotating the movable contactor of the tap selector corresponding to the forward and reverse feed in accordance with the direction of the power flow. Can be controlled accurately.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are configuration diagrams showing a bidirectional automatic voltage regulator according to an embodiment of the present invention, and FIGS. 1 to 3 are schematic diagrams showing the bidirectional automatic voltage regulator for one phase in each operating state. FIG. 4 is a block diagram of a part, and FIG. 4 is a block diagram of a tap selector used in the present invention. The same parts as those of the related art will be denoted by the same reference numerals and detailed description thereof will be omitted. FIG.
~ Fig. 3 shows an autotransformer 7 having an on-load tap changer 9.
The input / output of the distribution line to / from the load voltage regulator 16 is performed via the tap selector 6, and FIG. 1 shows a state at the time of forward feeding in which a power flow flows from the terminals 12a to 13a, and FIG. 3 shows a stage in the middle of reaching the state in which the distribution line to the load voltage regulator is switched when the power flow in FIG. 3 is reversed. As shown in FIG. It is a block diagram of a bidirectional automatic voltage adjustment device showing the state in the case of.

By the way, the tap selector 6 used in the bidirectional automatic voltage adjusting device of the present invention includes (1) to (1) of FIG.
As shown in (3), the fixed contacts 3a to 3d constituting the tap selector 6 are mounted on the mounting base 5 made of an insulating plate.
The movable contactors 4a and 4b, which will be described later, are fixed on the circumference at an equal interval of 90 ° around the drive shaft 1 that rotationally drives the movable contactors 4a and 4b. The contacts 4a, 4b are formed in a semicircular plate shape which is divided into two, and have a structure in which they are insulated from each other by an insulator 2 at symmetrical positions with respect to the drive shaft 1.
The interval H ₁ between the movable contacts 4a and 4b is set to be smaller than the width dimension H ₂ of the fixed contact 3.

The movable contactor 4 is rotationally driven by a drive unit 19 shown in FIG. 5 attached to the upper portion of the drive shaft 1. This drive unit 19 has a groove 20 on the circumference of 45 °.
The Geneva gears 21 provided at intervals are fitted to the pin portions 24 provided in the Geneva drive 23 driven by the geared motor 22 shown in FIG. 6, and the Geneva drive 23 is rotated once about the rotation shaft 25 as a drive shaft. It is configured so as to be rotationally driven in the left-right direction in the circumferential direction of 90 ° about 1. By the rotation of the movable contactor 4, the fixed contactor 3 is selected. In addition, the movable contacts 4a and 4b are contact-connected with two fixed contacts 3 during a stop, and are connected with three fixed contacts 3 during a drive by adjusting the Geneva drive as described above. Has become.

FIG. 4 is an explanatory view of the selection operation of the fixed contactor 3 when the tap selector 6 is rotated counterclockwise, (1)
In the initial state, the movable contactor 4a is fixed contactors 3a and 3b, and the movable contactor 4b is fixed contactors 3c and 3d.
Are in conductive contact with, respectively. (2) shows a state in which the movable contactor 4 is being driven. The movable contactor 4a contacts the fixed contactors 3a, 3b, 3d, and the movable contactor 4b contacts the movable contactors 3a, 3c, 3d. It shows a short-circuited state. Further, (3) shows a state where the operation is completed, and the movable contactor 4a includes the fixed contactors 3b and 3d and the movable contactor 4b.
Is in contact with the fixed contacts 3a, 3c. That is, when the movable contactor 4 is rotated 90 ° by the Geneva mechanism, the selection operation of the fixed contactor 3 can be completed from the contact state of the fixed contactor 3 of (1) to the state of (3) in an open circuit state. it can.

Now, referring to FIG. 1 which shows an embodiment of the present invention.
The bidirectional automatic voltage regulator shown in FIG. 3 has a configuration in which the tap selector 6 is connected to a distribution line, and the load voltage regulator 16 is input / output through the tap selector 6, and As shown in FIG. 9 of the above-mentioned conventional example, a reverse current relay 11 is provided which detects a forward / backward flow of a power flow by obtaining a phase difference between distribution line currents measured by a current transformer 10. Then, the distribution lines on the terminal side of the distribution lines 12a and 13a are fixedly contacted with the fixed contacts 3a and 3d of the tap selector 6 with the load tap changer 9 on the input side of the load voltage regulator 16. The output side autotransformer 7 is fixed to the child 3b.
It is connected to c and respectively. Further, the current transformer 10 and the reverse current relay 11 are the above-mentioned autotransformer 7 and fixed contactor 3.
It is provided on the line between c and is directly connected to the drive shaft 1 of the movable contactor 4 of the tap selector 6 by the control signal 6a from the control circuit 11a based on the detection signal at the time of the reverse flow of the power flow by the reverse relay 11. The configured geared motor 22 is automatically and intermittently driven. In the bidirectional automatic voltage regulator according to the embodiment of the present invention described above, the on-load voltage regulator 16 including the load tap changer 9 and the autotransformer 7, and the tap selector 6 are stored in the same storage box. And a reverse flow relay 11 and a control circuit 11a in a control box.

When the power flow in FIG. 1 is forward, the tap selector 6 is in the state of (1) in FIG. 4, and the movable contactor 4a is movable with the stator contacts 3a and 3b. Contact 4
b is in contact with the fixed contacts 3c and 3d,
In this state, the taps 8a to 8e of the autotransformer 7 are connected to the tap changer 9 of the load voltage regulator 16 according to the load change.
To adjust the voltage of the distribution line. Since the power flow at this time is forward transmission as described above, the terminals 12a of the distribution line,
12b becomes the input side, and the current flowing through the tap selector 6 passes through the terminal 12a, the fixed contactor 3a, the movable contactor 4a, the fixed contactor 3b, the load tap changer 9, the autotransformer 7, The stationary contactor 3c, the movable contactor 4b, the stationary contactor 3d, and the terminal 13a flow in this order.

When the reverse flow is detected by the reverse current relay 11 due to the reverse flow of the power flow, the control circuit 11a as shown in FIG.
The tap changer 9 under load is switched to the plain position of the tap 8a of the autotransformer 7 by the control signal 9a from
By eliminating the voltage difference between the input and output of the autotransformer 7, the terminal 12
a, 13a, fixed contacts 3a to 3d, movable contact 4a,
4b, the load tap changer 9 and the autotransformer 7 are set to the same potential so that the fixed contactor 3 and the movable contactor 4 are switched to each other in a non-open circuit state and without arcing. Next, the movable contactor 4 of the tap selector 6 is rotated about the drive shaft 1 by the Geneva mechanism driven by the above-mentioned geared motor 22 by the control signal 6a of the control circuit 11a.

When the movable contactor 4 shown in FIG. 2 is in the middle of rotation, the movable contactor 4a includes the fixed contactors 3a, 3b and 3d.
The movable contactor 4b is in conductive contact with the movable contacts 3a, 3c, 3d and is temporarily short-circuited. FIG. 3 shows a state in which the switch selection operation is completed when the power flow is sent backward. The movable contact 4a contacts the fixed contacts 3b and 3d, and the movable contact 4b contacts the fixed contacts 3a and 3c. are doing. At this time, since the power flow is reversely sent as described above, the terminals 13a and 13b become the input side, and the current flowing through the tap selector 6 is the terminal 13a, the fixed contactor 3d, the movable contactor 4a, and the fixed contactor 3b. , Tap changer during load 9,
Flowing through the autotransformer 7, the fixed contactor 3c, the movable contactor 4
b, the fixed contactor 3a, the terminal 12a. Therefore, according to the bidirectional automatic voltage regulator of the present invention, even if the reverse power flow flows, the current input to the load voltage regulator 16 flows in the same direction as the forward power flow in FIG. Similarly to the case of normal feeding, the voltage of the distribution line can be adjusted by switching the taps 8a to 8e by the load tap changer 9 according to the load variation.

[0020]

As described above, in the bidirectional automatic voltage regulator according to the present invention, the tap selector is connected to the distribution line and the load voltage regulator so that the direction of the power flow from the reverse relay can be controlled. By detecting the change, it is possible to automatically switch the distribution line input / output to / from the load voltage regulator during forward / reverse feed in a short time without interrupting the distribution line. This can significantly reduce the adjustment work and contribute to the improvement of the reliability of the power supply. Further, between the movable contacts of the tap selector of the present invention, as long as it maintains an insulation distance corresponding to the voltage difference of the maximum tap adjustment width required for voltage adjustment of the distribution line of the transformer, Since the insulation distance corresponding to the input voltage of the distribution line is not required unlike the case where the switch is connected to the conventional distribution line in the open state, the tap selector can be made small and lightweight. Therefore, it is possible to obtain a compact bidirectional automatic voltage regulator that does not occupy an installation space.

Further, when the fixed contact of the tap selector is switched when the power flow is reversed, the tap position of the transformer is set to the plain position so that the fixed contact and the movable contact are all at the same potential. Therefore, it is not necessary to install a current limiting impedance that limits the cross current when switching by the conventional movable contactor, and there is no interruption of power, and a highly reliable bidirectional automatic voltage regulator that can perform tap selection operation without arcing. Can be provided. Further, when the bidirectional automatic voltage adjusting device according to the present invention is installed on the distribution line, the voltage can be adjusted according to the direction of the power flow, so that the input / output terminals of the distribution line can be Connections can be made arbitrarily, and there is an advantage that installation work time can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a bidirectional automatic voltage regulator for one phase in a state in which a power flow is normally transmitted according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of a bidirectional automatic voltage regulator for one phase, which represents a state in which a tap selector is being driven by detecting a reverse power flow.

FIG. 3 is a configuration diagram of a main part of a bidirectional automatic voltage regulator for one phase, which represents a state in which a power flow is in reverse transmission.

FIG. 4 is a configuration diagram of a tap selector used in the present invention, where (1) is the state of FIG. 1, (2) is the state of FIG.
(3) represents the state of FIG.

FIG. 5 is a partial front view of a Geneva gear for rotationally driving the movable contactor of the tap selector of the present invention.

FIG. 6 is a cross-sectional view of a main part of a Geneva mechanism unit that drives the Geneva gear of FIG.

FIG. 7 is an explanatory diagram of a form of a distribution line of a distribution system.

FIG. 8 is an explanatory diagram of a conventional method of switching a load voltage regulator during forward / backward flow of a power flow by a switch.

FIG. 9 is an explanatory diagram of a conventional switching system for switching the load voltage regulator during forward / backward flow of power flow by using a tap of a transformer.

[Explanation of symbols]

 1 Drive shaft 2 Insulator 3 Fixed contactor 3a Fixed contactor 3b Fixed contactor 3c Fixed contactor 3d Fixed contactor 4 Movable contactor 4a Movable contactor 4b Movable contactor 6 Tap selector 7 Autotransformer 8 Tap 9 Load tap changer 10 Current transformer 11 Reverse current relay 12a Distribution line terminal 12b Distribution line terminal 13a Distribution line terminal 13b Distribution line terminal 16 Load voltage regulator 19 Drive section 20 Groove section 21 Geneva gear 22 Guard motor 23 Geneva drive

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[Procedure amendment]

[Submission date] October 17, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

In order to solve the above-mentioned problems, the present invention uses a reverse current relay provided on a distribution line or a line of a transformer of a load voltage regulator connected to the distribution line. The forward and reverse directions of the power flow of the wire are detected, and the input / output direction of the distribution line connected to the load voltage regulator is determined by the fixed contacts connected to the input / output side of the distribution line. Switching between fixed contacts connected to the input / output side of the voltage regulator under load with a movable contactor in an open circuit state can be switched uninterrupted by a tap selector to forward or reverse power flow. In this case, it is possible to adjust the voltage of the distribution line by the load voltage regulator. As a result, even if a reverse power flow flows into the load voltage regulator, the distribution line can be automatically switched without power failure and the voltage can be adjusted in the same way as during normal power transfer without interruption. A compact, lightweight bidirectional automatic voltage regulator that does not require a power supply can be obtained. Also, when the power flow is sent back, fix the tap of the transformer of the load voltage regulator at the plain position,
By setting the fixed contact and the movable contact on the distribution line side and the load voltage regulator side to the same potential, it is possible to switch between the fixed contacts without interruption or arcing. Can increase the reliability of.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

A tap selector for switching between input and output to the load voltage regulator is provided on the circumference of each fixed contact connected to the input and output sides of the distribution line and the load voltage regulator. It is installed on the insulating plate at equal intervals and can be rotated.
By making the sliding contact while maintaining the energized state between each of the fixed contacts of the distribution line side and the load voltage regulator side in each of the divided movable contacts,
It is possible to obtain a small and lightweight tap selector capable of significantly saving labor for switching the distribution line to the load voltage regulator at the time of forward and reverse transmission of the power flow.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, by driving the movable contactor of the tap selector by the Geneva mechanism, a switching operation by intermittently rotating the movable contactor of the tap selector corresponding to forward / backward feed in accordance with the direction of the power flow. Can be controlled accurately.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

When the power flow in FIG. 1 is forward, the tap selector 6 is in the state of (1) in FIG. 4 described above, and the movable contactor 4a has the fixed contacts 3a and 3b and the movable contactor. Child 4b
Are in contact with the fixed contacts 3c and 3d, respectively, and in this state, the taps 8a to 8e of the autotransformer 7 are switched by the load tap changer 9 of the load voltage regulator 16 according to the load fluctuation. Adjust the voltage of the distribution line. Since the power flow at this time is forward transmission as described above, the terminals 12a, 1 of the distribution line are
2b becomes the input side, and the current flowing through the tap selector 6 is
Via the terminal 12a, fixed contactor 3a, movable contactor 4a, fixed contactor 3b, load tap changer 9, autotransformer 7, fixed contactor 3c, movable contactor 4b, fixed contactor 3
d, and then the terminal 13a.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

When the movable contactor 4 shown in FIG. 2 is in the middle of rotation, the movable contactor 4a includes the fixed contactors 3a, 3b and 3d.
The movable contactor 4b is in conductive contact with the movable contacts 3a, 3c, 3d and is temporarily short-circuited. FIG. 3 shows a state in which the tap selection operation is completed when the electric power flow is sent backward. The movable contactor 4a contacts the fixed contactors 3b and 3d, and the movable contactor 4b contacts the fixed contactors 3a and 3c, respectively. are doing. At this time, as mentioned above, the power flow is backward, so
The terminals 13a and 13b are input sides, and the current flowing through the tap selector 6 flows through the terminal 13a, the fixed contactor 3d, the movable contactor 4a, the fixed contactor 3b, the tap changer 9 under load, and the autotransformer 7. Fixed contact 3c, movable contact 4b,
The stationary contact 3a and the terminal 12a flow in this order. Therefore, according to the bidirectional automatic voltage regulator of the present invention, even if the reverse power flow flows, the current input to the load voltage regulator 16 flows in the same direction as the forward power flow in FIG. Similarly to the case of normal feeding, the voltage of the distribution line can be adjusted by switching the taps 8a to 8e by the load tap changer 9 according to the load variation.

Claims (4)

[Claims] 1. A load voltage regulator for adjusting a voltage of a distribution line by switching a tap of a transformer connected to the distribution line by a load tap changer, each of which is connected to an input / output side of the distribution line. Sliding between the fixed contactors and each fixed contactor connected to the input / output side of the load voltage regulator, and between these fixed contactors on the distribution line side and the load voltage regulator side in an open circuit state. A tap selector consisting of a movable contact, which is conductively connected while making contact, and a reverse current relay are provided by connecting them to the distribution line and the voltage regulator under load, and forward and reverse transmission of the power flow of the distribution line from this reverse current relay is provided. The change in direction is detected, and based on this detection signal, the connection between each fixed contactor connected to the input / output side of the voltage regulator during load and each fixed contactor on the distribution line side is connected to the movable tap selector. Switching contacts without interruption by driving the contact Note: By changing the input / output direction of the distribution line to the load voltage regulator, the load voltage regulator can be adjusted according to the direction of the power flow. apparatus. 2. The bidirectional automatic voltage regulator according to claim 1, wherein the tap of the transformer of the load voltage regulator is fixed at the through position when the power flow is sent back, and the distribution line side and the load voltage. A bidirectional automatic voltage adjusting device characterized in that the fixed contact and the movable contact on the regulator side have the same potential, and the fixed contact can be switched between the fixed contacts without arcing by the movable contact. 3. The bidirectional automatic voltage regulator according to claim 1, wherein a tap selector for switching the input / output of the distribution line to the load voltage regulator is connected to one end of the distribution line. Fixed contactor, a second fixed contactor connected to the other end, and a third fixed contactor connected to the input side of the load voltage regulator.
Fixed contactor and a fourth fixed contactor connected to the line output from the voltage regulator during load are installed on the insulating plate at equal intervals on the circumference, and between the fixed contacts adjacent to each other. It is composed of first and second movable contactors which are divided into two and are interlockingly rotated while slidingly contacting each other while keeping the energized state, and the first fixed contact is caused by rotation of these movable contactors. The child and the third fixed contact, and the second fixed contact and the fourth fixed contact, respectively.
And a second movable contactor in conductive contact with each other, and further, by rotation of the first and second movable contactors, the first fixed contactor, the fourth fixed contactor, and 2. A bidirectional automatic voltage regulator, wherein a second stator contact and a third fixed contact are connected in conductive contact with either the first or second movable contact, respectively. 4. The bidirectional automatic voltage regulator according to claim 2, wherein the first and second movable contacts of the tap selector are
A two-way automatic voltage regulator characterized by being intermittently rotationally driven by a Geneva mechanism comprising a Geneva gear, a plurality of groove portions of the Geneva gear, and a pin portion which engages with these groove portions and rotates.