JP2011200075A - Shutter opening and closing controller of switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prohibit intentional opening of a shutter at a charging part during operation in a switchgear, while bus-line charging is performed, to allow operation by opening the shutter during outage of bus-line, and to allow pushing in of a breaker, even during bus-line charging.SOLUTION: The shutter opening and closing controller of a switchgear includes an electric lock 35 capable of regulating movement of a shutter 20 in opening direction while the shutter 20 closes the front of a disconnector, a bus-line charge/outage determination circuit 50 which determines charge/outage state of a bus-line, and a release switch 37 arranged on a moving locus of the breaker or its vicinity. When a charging state is confirmed by the bus-line charge/outage determination circuit 50 while the release switch 37 is locked, the electric lock 35 is closed, to regulate movement of the shutter 20 in opening direction; and when an outage state is confirmed by the bus-line charge/outage determination circuit 50 or the release switch 37 is opened, the electric lock 35 is released to allow movement of the shutter 20 in opening direction.

Description

  The present invention relates to a shutter opening / closing control device that controls opening / closing of a shutter disposed in front of a disconnection portion in a switchgear for opening / closing an electric circuit installed in a facility such as a substation.

  The switchgear is designed so that the circuit breaker, which is a storage device, can be divided and put in and out even during charging. When the circuit breaker is pulled out, the fixed contact (charged part) of the disconnecting part is It will be in a state where it is exposed and easily touched or approached. For this reason, in order to prevent such a charging part from contacting or approaching, the shutter which consists of an insulating member is provided in front of a disconnection part so that opening and closing is possible (refer patent document 1, 2).

  When such a shutter is pulled out of the switchgear main body, the shutter moves so as to close the front of the disconnecting portion, and when the circuit breaker is pushed into the switchchain main body, the shutter moves upward or downward to move the front of the disconnecting portion. So that the external contactor of the circuit breaker can be inserted into the fixed contactor of the disconnecting portion.

However, in spite of such a configuration, if the shutter is moved in a state where the circuit breaker is pulled out, the fixed contact in the charged state may be accidentally touched, resulting in an electric shock. In particular, in a CB for a substation of a substation having a plurality of banks, when one bank is in a power outage, a charging part and a power outage part coexist in the switchgear main body, so that a post-misidentification is likely to occur.
For this reason, conventionally, as shown in Patent Document 3, a barrier is provided on the back side of the door of the housing, an electric lock for managing the opening and closing of the barrier is provided, and a transformer for detecting the charged state of the high-voltage portion is provided. During installation and charging, an electric current is passed to the electric lock through the transformer to make it locked, so that the barrier cannot be opened and closed, and during a power failure, the electric lock can be opened to open and close the barrier. Therefore, a configuration for preventing an electric shock accident of an operator during maintenance and inspection work of the high-voltage power receiving facility is considered.

Japanese Patent Laid-Open No. 06-165323 JP 2006-42503 A Japanese Patent Laid-Open No. 10-174218

However, in the conventional configuration in which a barrier is provided on the back side of the switchgear door and this is locked and controlled, the switchgear cannot be put in unless it is in a power failure state. Therefore, there is an inconvenience that the individual inspection of the distribution line becomes impossible and it is not practical.
Also, in the prior art where the barrier cannot be opened and closed while the bus is being charged, the bus side work during the bus power failure is possible, but during the bus charging, the circuit breaker is pushed in and the external contactor of the circuit breaker is connected to the switchgear body. There is also an inconvenience that the work conventionally performed to connect to the fixed contact of the disconnecting portion cannot be performed.

  The present invention has been made in view of such circumstances, so that the shutter of the charging unit cannot be intentionally opened during work in the switchgear during bus charging, and the shutter can be opened and closed during bus charging. The main object of the present invention is to provide a switchgear shutter opening / closing control device in which the circuit breaker can be pushed by releasing the lock when the required circuit breaker is pushed.

  In order to achieve the above object, a switchgear shutter opening / closing control device according to the present invention includes a switchgear body, a pull-out type circuit breaker provided so as to be able to be pulled out with respect to the switchgear body, and a switchgear body. In a control device that is used in a switchgear having a shutter that opens and closes the front of the disconnecting portion and an opening and closing link mechanism that opens and closes the shutter, the shutter is configured to be able to regulate the opening and closing operation of the shutter. An electric lock that can regulate movement in the opening direction of the shutter in a state where the front of the shutter is closed, a bus charging / discharging determination circuit that determines a charging / discharging state of the bus, and a movement locus of the breaker or in the vicinity thereof And is opened when the breaker is close to the disconnection part within a predetermined range, and is closed when the breaker is separated from the disconnection part beyond the predetermined range. When the state of charge is determined by the release switch and the bus charge / power failure determination circuit, and the release switch is closed, the electric lock is locked to restrict movement of the shutter in the opening direction, at least When the power failure state is determined by the bus charge / power failure determination circuit, or when the release switch is opened, the electric lock is unlocked to allow the shutter to move in the opening direction. Yes.

  Therefore, in the electric lock that regulates the movement of the shutter in the opening direction, the state of charge of the bus is determined by the bus charge / power failure determination circuit, and the release switch is closed by separating the breaker beyond the predetermined range from the disconnection part. In this case, that is, when the disconnection portion is charged even after the breaker is pulled out, the movement of the shutter in the opening direction is restricted by locking the electric lock. Even if it tries to open it, it cannot be opened, and the worker does not get an electric shock by touching the charging part.

  If at least the bus is in a power failure state, the release switch is opened, or if both conditions are satisfied, the electric lock is unlocked and the shutter is allowed to move in the opening direction. Therefore, the bus side work can be performed during the bus power failure, and the circuit breaker can be pushed in during the bus charging.

  Here, the electric lock for restricting the movement of the shutter in the opening direction may be provided at a place for restricting the movement of the opening / closing link mechanism. That is, since the shutter moves in the vertical direction in front of the disconnection portion and closes or opens the front surface of the disconnection portion, the movement of the link mechanism that forms such a movement of the shutter is restricted by an electric lock. This makes it possible to regulate the movement of the shutter in the opening direction.

  Further, the electric lock that restricts the movement of the shutter in the opening direction may be arranged on the movement trajectory of the shutter and directly restrict the movement of the shutter. For example, if the shutter is moved upward from the front position of the disconnecting portion to open the front of the disconnecting portion, an electric lock may be provided on the upper portion of the shutter so that the shutter does not move upward.

  Further, the release switch is disposed outside the rail on which the circuit breaker moves, opens while being pressed by a pressing member provided on the switch gear body, and is released from the pressing member to release the pressing state. For example, a release switch is provided on both sides of the rail on which the circuit breaker moves, the state of charge is determined by the bus charge / power failure determination circuit, and at least one of the release is released. When the switch is closed, the electric lock is locked to restrict the movement of the shutter in the opening direction, and the power failure state is judged by the bus charge / power failure judgment circuit, or when both release switches are opened In addition, the electric lock may be unlocked to allow movement of the shutter in the opening direction.

  Here, the above-described opening / closing link mechanism has an arm member that is pushed up by a push-up member provided on the side of the circuit breaker, and is configured to push up the shutter to move to the open position following the push-up of the arm member. Adopt it.

  As described above, according to the switchgear shutter opening / closing control device according to the present invention, the state of charge of the bus is determined by the bus charge / power failure determination circuit, and the release switch is closed because the breaker is separated from the disconnection portion. In this case, since the movement of the shutter in the opening direction is restricted by locking the electric lock, the worker enters the switchgear body while the busbar is charged and moves the shutter intentionally. Even if it does so, it becomes impossible to move a shutter to an opening direction, and an operator does not touch a charging part and does not receive an electric shock.

  In addition, when the bus is in a power failure state, the electric lock is unlocked and the shutter can be moved in the opening direction, so that it is possible to work on the bus side during the bus power failure. Even in the charged state, if the breaker is brought close to the disconnection part, the electric lock is unlocked and the shutter can be moved in the opening direction. The instrument can be pushed in.

FIG. 1 is a diagram showing an overall configuration of a switchgear in which a shutter opening / closing control device according to the present invention is used. FIG. 2 is a plan view showing the circuit breaker and the disconnecting portion to which the circuit breaker is mounted. FIG. 3A is a perspective view showing a shutter and an opening / closing link mechanism of the switchgear body, and FIG. 3B is a perspective view showing a side portion of the circuit breaker. 4A and 4B are diagrams showing an open / close link mechanism, where FIG. 4A is a diagram showing a state where the circuit breaker is sufficiently separated from the disconnecting portion and the shutter is blocking the front of the disconnecting portion, and FIG. The figure which shows the state which the device moved close to the disconnection part and the shutter moved upward and opened the front of the disconnection part about half, (c) is the shutter moved upward and fully opened the front of the disconnection part, It is a figure which shows the state which the breaker inserted in the disconnecting part. FIG. 5 is a circuit diagram showing an electric lock control circuit. 6A and 6B are diagrams showing another configuration example of the switchgear in which the shutter opening / closing control device according to the present invention is used. FIG. 6A is a diagram showing an example of the overall configuration of the switchgear, and FIG. The figure which shows a relationship, (c) is a perspective view which shows a shutter and an opening-and-closing link mechanism.

  Embodiments of a switchgear shutter opening / closing control apparatus according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a switchgear 1 includes a switchgear body 3 in which a busbar drawn from a substation, a distribution line for supplying power to a consumer, a circuit breaker, and the like are housed in a housing 2, and a switchgear body 3. And a channel base 4 that supports the switchgear main body 3.
A circuit breaker chamber 6 is defined by a partition wall 5 at the uppermost front side in the housing 2, and a cable chamber 7 is defined behind the circuit breaker chamber 6. The partition wall 5 is provided with a disconnecting portion 8 through an opening formed here. The disconnecting portion 8 is provided such that the front portion faces the circuit breaker chamber 6 and the rear portion faces the cable chamber 7, and includes a power supply side disconnecting portion 8a and a load side disconnecting portion 8b. Has been. As shown in FIG. 2, these disconnecting portions 8 (power supply side disconnecting portion 8 a and load side disconnecting portion 8 b) are arranged for three phases in the horizontal direction (perpendicular to the plane of FIG. 1). .
Below the circuit breaker chamber 6 of the cable chamber 7, a distribution secondary bus 16 positioned on the secondary side of a distribution transformer (not shown) is supported by a support insulator 15 and arranged in the horizontal direction. The next bus 16 is connected to the power supply side disconnecting portion 8 a via the bus 14. Further, the terminals of each phase of the load side disconnecting portion 8 b are connected to the terminals of the distribution line 10 through the copper strip 11.
The circuit breaker 12 is a publicly known one, and is a pull-out type three-phase circuit breaker having an external contactor 13 that is inserted into and removed from the power supply side disconnect part 8a and the load side disconnect part 8b. That is, the circuit breaker 12 has external contacts 13 of each phase protruding in a substantially horizontal direction, and the external contacts 13 are inserted from the front portion of the disconnecting portion 8 to become fixed contacts inside the disconnecting portion. It can be connected.
Therefore, the current flowing from the secondary distribution bus 16 flows through the circuit breaker 12 before flowing to the distribution line 10, and in the switch gear body 3 during normal operation, the distribution 2 From the next bus 16 to the bus 14, the power supply side disconnecting part 8a, the circuit breaker 12, the load side disconnecting part 8b, and the copper strip 11, an electric circuit connected to the distribution line 10 is formed, and power is supplied from the distribution line 10 to each consumer. To be done. The circuit breaker 12 can cut off the load current flowing in this electric circuit.
In FIG. 1, other partition plates and devices (such as test terminals and lightning arresters) are omitted for convenience of explanation.

  In addition, as shown in FIG. 3A, a shutter 20 is disposed in the circuit breaker chamber 6 so as to cover the front of the disconnecting portion 8. The shutter 20 is provided so as to be movable up and down by an opening / closing link mechanism 21, thereby opening or closing the front of the disconnecting portion 8.

  More specifically, the shutter 20 is formed in a rectangular plate that can cover the front surfaces of the power-side disconnecting portion 8a for three phases and the load-side disconnecting portion 8b for three phases, and the power-side disconnecting portion 8a. And the load-side disconnecting portion 8b are arranged in parallel vertically, fixed to a lifting arm 23 of an opening / closing link mechanism 21 described later, and moved up and down by moving the lifting arm 23 up and down. ing.

  The open / close link mechanism 21 is provided on both the left and right sides of the shutter 20 and on the left and right sides of the circuit breaker chamber 6, and includes a rotating arm 22 that rotates as the circuit breaker 12 is pulled out and pushed in. The lifting arm 23 is pivotally attached to the tip of the pivoting arm 22 and is moved by the pivoting arm 22 to move in the vertical direction. The lifting arm 23 is supported by the casing 2 so as to be tiltable up and down. And a support arm 24 that is configured.

The rotation arm 22 has a rotation fulcrum on the side wall of the circuit breaker chamber 6, the rear end portion (cable chamber side) is a rotation end, and a long hole 22a is formed in the vicinity of the rotation end. The lower end of the elevating arm 23 is slidably attached to the elongated hole 22a via a U link member or the like. As the circuit breaker 12 moves back and forth, the rotating arm 22 is configured such that a locking pin 30 provided on the side surface of the circuit breaker 12 is in sliding contact with the lower outer edge, and the lower side of the rotating end portion. In a state where the locking pin 30 is in contact with the outer edge, the rotating end portion is substantially horizontal, and the shutter 20 is displaced upward to a position where the front surface of the disconnecting portion 8 is completely opened. . Further, the intermediate portion following the rotation end portion of the rotation arm 22 is inclined upward when the rotation end portion is substantially horizontal, and the support end portion following this intermediate portion is the rotation end portion. Are formed so as to be substantially parallel to each other.
Therefore, the locking pin 30 provided on the side surface of the circuit breaker 12 abuts on the cam surface formed by the lower outer edge of the rotating arm 22 when the circuit breaker 12 moves back and forth, and along this cam surface. The tilt angle of the rotating arm 22 is changed while sliding.

  The elevating arm 23 moves up and down as the rotating arm 22 rotates, and the side end of the shutter 20 is fixed to the upper end portion and the intermediate portion.

  The support arm 24 is supported in the vicinity of the disconnecting portion 8 of the partition wall 5 so as to be pivotable in the vertical direction. The support arm 24 is formed in a cylindrical shape, and the lifting arm 23 is inserted therethrough so that the lifting arm 23 It has a function to guide the vertical movement.

  A stopper 25 fixed to the housing 2 is provided below the rotating end of the rotating arm 22, and the rotating arm 22 is provided with the lifting arm 23 as long as no force is applied to the rotating arm 22. Further, the rotating end is in contact with the stopper 25 due to the weight of the shutter 20. The shutter 20 is fixed to the elevating arm 23 so as to close the front of the disconnecting portion 8 in a state where the rotating end of the rotating arm 22 is in contact with the stopper 25.

  Further, as shown in FIG. 3 (b), a locking pin (push-up member) 30 is fixed to the upper part of the front side on both side surfaces of the bogie frame 26 of the circuit breaker 12. The wheels 27 and 28 are provided on the front and rear, and a pressing plate (pressing member) 31 protruding sideways is provided horizontally between these wheels.

  Therefore, when the circuit breaker 12 is moved from the position shown in FIG. 4 (a), the locking pin 30 provided on the carriage frame 26 reaches the inclined portion of the rotating arm 22, and the rotating arm 22 is moved. It gradually turns upward, and accordingly, the lifting arm 23 attached to the turning end of the turning arm 22 moves upward (FIG. 4B). Then, when the locking pin 30 reaches the rotating end of the rotating arm 22, the shutter 20 moves to a position where the front of the disconnecting portion 8 is completely opened, and when the breaker 12 is further pushed in this state, The external contact 13 of the circuit breaker 12 is connected to the fixed contact of the disconnecting portion 8 (FIG. 4C). Further, when the circuit breaker 12 is pulled out and moved backward from this state, when the locking pin 30 is disengaged from the rotating end portion of the rotating arm 22 and reaches the inclined portion, the rotating arm 22 is gradually rotated downward. Accordingly, the shutter 20 descends downward (FIG. 4 (b)), and when the rotating arm 22 comes into contact with the stopper 25, the downward rotation is stopped at that time, and FIG. ), The front of the disconnecting portion 8 is completely closed by the shutter 20.

  In such a drive mechanism of the shutter 20, for example, an electric lock 35 from which the rod 35 a protrudes when energized is provided at a position beside the rotation locus of the rotation arm 22. The electric lock 35 is provided so that the rod 35a can protrude above the vicinity of the rotation end when the rotation end of the rotation arm 22 is located at the lowest position. There is a box lock having a rod 35a as a locking piece and a drive unit (not shown) for driving the rod 35a.

  A release switch 37 that is opened when the circuit breaker 12 passes is provided below the rotating arm 22 and beside the rail 36 on which the wheels 27 and 28 of the circuit breaker 12 move. The release switch 37 is disposed outside the rail 36 on both sides of the circuit breaker 12 and is normally closed, and is pressed by a pressing plate 31 provided at the lower part of the carriage frame 26 of the circuit breaker 12. When the mover of the release switch 37 is pressed, the open state is established. In this example, the size of the pressing plate 31 in the circuit breaker moving direction is such that, for example, the circuit breaker 12 is completely connected to the disconnecting portion 8 from the position where the locking pin 30 starts to contact the lower outer edge of the rotating arm 22. The size is set such that the release switch 37 is kept pressed until it is pushed to the position.

Further, the switchgear main body 3 is provided with a bus charge / power failure judgment circuit 50 for confirming whether or not the bus (14 or 16) of the switchgear 1 is charged. As shown in FIG. 5, the bus charging / discharging determination circuit 50 includes, for example, an instrument transformer (GPT) 39 that detects whether the bus 14 is charged, and a relay 40 connected to the instrument transformer 39. When the charging of the bus 14 is detected by the instrument transformer 39, the relay 40 is closed and the relay 40 in which a power failure is confirmed is opened.
Although this explanation is given for the distribution box, it is also adopted for other switchgears by adopting a similar circuit (in the busbar connection box etc., relays 40 are provided on both busbars and connected in parallel to the control circuit). Is possible.

Release switches 37 provided on both sides of the movement path of the circuit breaker 12 are connected in parallel, and this parallel circuit includes the relay 40 of the bus charge / power failure determination circuit 50 and the unlocking of the electric lock 35. Is connected in series to the power supply system together with the controller 41 for controlling the electric lock, and constitutes an electric lock control circuit 51 for operating the electric lock 35 according to the open / close state of the relay 40 and the open / close state of the release switch 37.
That is, if charging of the bus 14 is detected by the instrument transformer 39 and the relay 40 is closed, and any one of the release switches 37 provided on both sides of the movement locus of the circuit breaker 12 is closed, Power is supplied from the power supply system to the controller 41, and power is supplied to the electric lock 35 through the controller 41 to form a locked state (the rod 35a protrudes by the drive unit of the electric lock 35). When the relay 40 is opened or both the release switches 37 provided on both sides of the movement path of the circuit breaker 12 are opened, the power supply from the power supply system to the controller 41 is cut off, and the controller 41 Thus, the power supply to the electric lock 35 is cut off, and the unlocked state is formed (the rod 35a is retracted by the drive unit of the electric lock 35).

Therefore, when the bus 14 is in a charged state and the circuit breaker 12 is pulled off, the relay 40 and both release switches 37 are closed, so that the electric lock 35 is in a locked state, and the open / close link mechanism Since the movement of the rotary arm 22 is restricted by the electric lock 35, even if an operator who has entered the circuit breaker chamber 6 intentionally raises the shutter 20, the upward movement of the shutter 20 is prevented. In addition, it is possible to maintain a state where the front side of the disconnecting portion 8 is closed by the shutter 20.
At this time, even if one of the release switches 37 is pressed to open the shutter in order to intentionally push up the shutter, the release switch 37 is connected in parallel to the power source together with the other release switches 37. Therefore, even if one release switch 37 is opened, power is continuously supplied to the electric lock 35 and the locked state is maintained (the state in which the rod 35a protrudes by the drive unit of the electric lock 35). Pushing up the shutter 20 is prevented.
Further, since the two release switches 37 are arranged on both sides of the movement path of the circuit breaker 12, they are arranged sufficiently apart from each other, and one worker presses the two release switches 37 at the same time. It is impossible to achieve the open state, and it is possible to reliably prevent the shutter 20 from being pushed up intentionally.

  On the other hand, when the bus 14 is not in the charged state, the relay 40 is opened, or both release switches 37 are pressed by the pressing plates 31 provided on both sides of the circuit breaker by pushing the circuit breaker 12 pulled out. When the door is opened by pressing, the electric lock 35 is unlocked, and the movement of the turning arm 22 of the opening / closing link mechanism 21 is not restricted by the electric lock 35. For this reason, when the worker is in the switchgear main body but the bus bar 14 is not in a charged state, the shutter 20 can be pushed up and work on the bus bar side can be performed. Further, even when the bus bar 14 is in a charged state, it is possible to push the circuit breaker 12 and connect the external contactor 13 of the circuit breaker 12 to the fixed contactor of the disconnecting portion 8. The circuit breaker 12 can be pushed in.

In the above-described configuration, the case where the electric lock 35 is attached to the position where the movement of the opening / closing link mechanism 21 is restricted is shown. However, as shown in FIG. A lock 35 may be arranged. Specifically, the electric lock 35 is disposed on the base 42 provided on the upper portion of the disconnecting portion 8 so that the rod 35a protrudes on the movement locus of the shutter 20 and directly regulates the movement of the shutter 20, and the above-described operation is performed. As described above, when the bus 14 is in a charged state and any one of the release switches 37 is closed, the rod 35a is projected by being energized to be locked, and the upward movement of the shutter 20 is restricted. Also good.
Since the other configuration is the same as the configuration described above, the same portions are denoted by the same reference numerals and description thereof is omitted. Such a configuration also has the same operational effects as the above configuration example.

Further, the link mechanism is not limited to the above-described configuration, and any other configuration may be adopted as long as it is an open / close link mechanism that opens and closes the shutter 20 when the circuit breaker 12 is pulled out and pushed.
Furthermore, in the above-described configuration, the release switch is provided on the side of the rail and the release switch is pressed by the pressing plate 31 provided on the circuit breaker 12. A configuration may be adopted in which the release switch is pressed by the circuit breaker itself.

DESCRIPTION OF SYMBOLS 1 Switch gear 3 Switch gear main body 8 Disconnection part 12 Circuit breaker 14, 16 Bus 20 Shutter 21 Opening / closing link mechanism 35 Electric lock 37 Release switch 50 Bus charge / power failure judgment circuit 51 Electric lock control circuit

Claims (6)

A switchgear main body, a pull-out type circuit breaker provided so as to be able to be pulled out with respect to the switchgear main body, a shutter that opens and closes the front of the disconnecting portion in the switchgear main body, and an open / close link mechanism that opens and closes the shutter In a switchgear shutter opening / closing control device that is capable of regulating the opening / closing operation of the shutter,
An electric lock that can regulate the movement of the shutter in the opening direction when the shutter is blocking the front of the disconnection portion, a bus charge / power failure determination circuit that determines a charge / power failure state of the bus, and the circuit breaker Displacement that is placed on or near the movement trajectory and opens when the breaker is close to the disconnection part within a predetermined range, and closes when the breaker is separated from the disconnection part beyond the predetermined range When the state of charge is determined by the switch and the bus charge / power failure determination circuit, and the release switch is closed, the electric lock is locked to restrict the movement of the shutter in the opening direction,
When the power failure state is determined by at least the charge / power failure determination circuit, or when the release switch is opened, the electric lock is unlocked to allow the shutter to move in the opening direction. A switchgear shutter opening / closing control device.   The switchgear shutter opening / closing control device according to claim 1, wherein the electric lock regulates movement of the opening / closing link mechanism.   2. The switchgear shutter opening / closing control device according to claim 1, wherein the electric lock is arranged on a movement locus of the shutter and directly regulates the movement of the shutter.   The release switch is disposed outside the rail on which the circuit breaker moves, and is opened while being pressed by a pressing member provided on the switch gear body, and is released from the pressing member and released from the pressing state. 2. The switchgear shutter opening / closing control device according to claim 1, wherein the switchgear shutter is closed. The release switch is provided on both sides of the rail on which the circuit breaker moves,
When the state of charge is determined by the bus charge / power failure determination circuit, and when at least one of the release switches is closed, the electric lock is locked to restrict movement of the shutter in the opening direction,
The electric lock is unlocked when the power failure state is determined by the charge / power failure determination circuit, or when both release switches are opened, and the movement of the shutter in the opening direction is allowed. A switchgear shutter open / close control device according to claim 4.   The open / close link mechanism includes an arm member that is pushed up by a push-up member provided on a side portion of the circuit breaker, and the shutter is pushed up and moved to an open position following the push-up of the arm member. The switchgear shutter opening / closing control device according to claim 1.

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