JP2012129143A - Electromagnetic operating device and drive circuit of switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and capacity of a closing coil in the electromagnetic operating device and the drive circuit of a switchgear which uses a breaking coil and a release spring to perform a break operation and uses a closing coil to store energy of the release spring and perform a make operation.SOLUTION: A closing only coil 1 and a closing/breaking shared coil 2 are energized when a switchgear is turned on, and a movable element 102 is attracted by electromagnetic forces of both the closing only coil 1 and the closing/breaking shared coil 2, thus moving inside the closing only coil 1 and the closing/breaking shared coil 2 until it is stuck to a permanent magnet 105. When the switchgear is turned off, the movable element 102 is made to move in the opposite direction than at make time by an electromagnetic force generated by the closing/breaking shared coil 2 as it is energized to a reverse polarity than at make time and a released force of stored energy from the release spring 104 which was compressed at make time, causing a movable contact 103m to separate from a fixed contact 103s, thus performing a break operation.

Description

  The present invention relates to an electromagnetic operating device and a drive circuit of an opening / closing device in which a shut-off operation is performed by a shut-off coil and an open spring, and an open coil is stored and charged by a close coil.

  2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-92746 (Patent Document 1), there is an electromagnetic operation device and a drive circuit of a switchgear that performs a shut-off operation by a shut-off coil and a turn-on operation by a close-up coil.

JP 2010-92746 A (FIG. 1 and its description)

When using the electromagnetic operating device and the drive circuit of the switchgear as described in Patent Document 1 to cause the opening spring to store and close the opening spring, the closing coil stores the opening spring and stores it. The energy required to perform both of these is required, a large and large-capacity input coil is required, the stored energy of the dedicated coil increases, and when the stored energy is released, the switch and the stored energy attenuation circuit required to start the attenuation of the stored energy A large capacity is required.
Although it is conceivable to reduce the size of the dedicated coil and allow a large current to flow through the dedicated coil, there is a restriction on the capacity of the switch necessary to cut off the supply of current to the dedicated coil.
Further, when the stored energy of the dedicated coil is large, it is also necessary to prevent the surge generated by the stored energy attenuation circuit from exceeding the withstand voltage of the switch necessary for starting attenuation of the stored energy.

  The present invention has been made in view of the above-described circumstances, and is an electromagnetic operating device for an opening / closing device in which a shut-off operation is performed by a shut-off coil and an open spring, and an opening spring is stored and charged by a close coil. The purpose of the present invention is to make the input coil small and small in the drive circuit.

An electromagnetic operating device for a switchgear according to the present invention includes a movable contact driving rod for driving a movable contact,
An annular dedicated coil through which this movable contact drive rod penetrates concentrically to move,
An annular closing / coiling coil that is adjacent to the movable contact side of the dedicated coil for insertion and through which the movable contact driving rod is concentrically penetrated.
A permanent magnet adjacent to the movable contact side, the movable contact drive rod attached to the closing / coiling coil, and the closing coil and the closing / coiling coil are energized when the switchgear is turned on. The movable contact is attracted by the electromagnetic force of both the closing / breaking coil and moved in the closing dedicated coil and the closing / coiling coil, and is attracted to the permanent magnet, and the movable contact becomes a fixed contact via the movable contact driving rod. A magnetic mover to be inserted, and one end fixed to the movable contact drive rod and the other end fixed to a fixed spring support fixing member. An open spring that is compressed and stored through the spring support fixing member;
When the switchgear is shut off, the closing / shutdown common coil is biased in the opposite polarity to that when the switchgear is turned on. The movable element moves in a direction opposite to that at the time of insertion by the stored energy release output, and the movable contact moves away from the fixed contact through the movable contact driving rod by movement of the movable element in the direction opposite to that at the time of insertion. It will be shut off.

Further, the drive circuit for the switchgear according to the present invention performs switching on and off of the switchgear by using a dedicated coil that is energized when energized and a common coil that is energized and energized when energized. A drive circuit for an opening / closing device that is energized when the common coil is energized with a polarity opposite to that of the opening / closing of the opening / closing device, and shuts off the opening / closing device in cooperation with an opening spring;
A first energization circuit for supplying charging energy of the charging drive capacitor to the dedicated coil by the first operation of the first switching switch when the switchgear is turned on;
A second energization circuit for supplying charging energy of the input driving capacitor to the input / cut-off shared coil by the first operation of the second input switch and the first operation of the coil switching relay when the switchgear is turned on; A third energization circuit that supplies the charging energy of the cutoff drive capacitor to the reverse polarity coil to the on / off shared coil by the first operation of the cutoff switch and the second operation of the coil switching relay when the switchgear is shut off It is equipped with.

  An electromagnetic operating device for an opening / closing device according to the present invention includes a movable contact driving rod for driving a movable contact, an annular dedicated coil through which the movable contact driving rod passes concentrically in a movable manner, and the movable contact to the dedicated coil. An annular closing / breaking shared coil that is adjacent to the side and through which the movable contact drive rod penetrates concentrically in a movable manner, a permanent magnet adjacent to the closing / contacting coil on the movable contact side, and attached to the movable contact drive rod When the closing dedicated coil and the closing / shut-off common coil are energized when the switchgear is turned on, they are attracted by the electromagnetic force of both the closing dedicated coil and the closing / shut-off shared coil, and the closing dedicated coil and the closing / shut-off common coil The movable contact is attracted to the permanent magnet and moved through the movable contact driving rod. A magnetic movable element to be inserted into a tact, and one end fixed to the movable contact driving rod and the other end fixed to a fixed spring support fixing member, and the movable contact being driven by movement of the movable element when the opening / closing device is inserted An open spring that compresses and accumulates energy via a rod and the spring support fixing member is provided, and when the switchgear is shut off, the on / off shared coil is biased to the opposite polarity to that when the switchgear is turned on, and this reverse polarity is biased The movable element moves in a direction opposite to that when the movable element is turned on due to the electromagnetic force of the common coil for closing and closing and the stored energy release output of the release spring compressed at the time of turning on. Since the movable contact moves away from the fixed contact via the movable contact driving rod by moving in the direction, the cutoff operation is performed by the cutoff coil and the release spring. Poured only coil in the electromagnetic operating device switchgear prestressing and closing operation of the open spring is effected by closing coil has the effect that can be miniaturized small capacity.

  Further, the drive circuit of the switchgear according to the present invention switches on the switchgear by a dedicated coil that is energized when energized and a common coil that is energized and energized when energized. A switching circuit drive circuit that is energized when the coil is energized in the opposite polarity to that of the switching device, and shuts off the switching device in cooperation with an opening spring. A first energization circuit that supplies the coil for exclusive use by the first operation of the first input switch, the charging energy of the input drive capacitor when the switchgear is turned on, and the first operation and coil of the second input switch A second energizing circuit that supplies the coil for both turning on and off by the first operation of the switching relay, and for cutting off the charging energy of the shut-off drive capacitor when the switchgear is shut off Since the third operation circuit for supplying the reverse polarity to the closing / coiling common coil by the first operation of the switch and the second operation of the coil switching relay is provided, In the electromagnetic operation device of the switchgear in which the closing operation is performed and the opening spring is stored and the closing operation is performed by the closing coil, there is an effect that the closing dedicated coil can be reduced in size and capacity.

It is a figure which shows Embodiment 1 of this invention, and is a figure which illustrates the state of the electromagnetic operating device in a switching device input state. It is a figure which shows Embodiment 1 of this invention, and is a figure which illustrates the state of the electromagnetic operating device in a switchgear cutoff state. It is a figure which shows Embodiment 1 of this invention, and is a figure which illustrates the circuit state of the drive circuit at the time of switching device opening. FIG. 5 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating operation timing of each part of FIG. 3. It is a figure which shows Embodiment 1 of this invention, and is a figure which illustrates the circuit state of the drive circuit at the time of switchgear interruption | blocking. FIG. 6 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating the operation timing of each unit in FIG. 5.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. In addition, in each figure, the same code | symbol shows the same part.

  1 and 2, an opening / closing device 100 includes an annular closing coil 1, an annular closing / breaking shared coil 2, a closing drive capacitor 5, a blocking drive capacitor 6, an electromagnetic operating mechanism 101, and a magnetic mover. 102, a switch 103 such as a vacuum valve, a movable contact 103m of the switch 103, a fixed contact 103s of the switch 103, an open spring 104, a permanent magnet 105, a drive circuit 106, and a magnetic movable element 102 are mounted, and the movable contact when moving A movable contact drive rod 107m for driving 103m, a fixed contact support rod 107s for supporting the fixed contact 103s, a spring seat 108 for fixing one end of the release spring 104 to the movable contact drive rod 107m, and the other end of the release spring 104 are fixed. A spring support fixing member 109 is provided.

  The electromagnetic operation mechanism 101 includes a closing coil 1, a closing / breaking shared coil 2, a mover 102, an opening spring 104, a permanent magnet 105, a spring receiving seat 108, and a spring receiving fixing member 109.

  The switch 103 includes a movable contact 103m and a fixed contact 103s.

  FIG. 1 shows a state in which the switchgear is turned on. The mover 102 is in the annular closing / breaking shared coil 2 and is attracted to the permanent magnet 105, and the movable contact 103m of the switch 103 is in contact with the fixed contact 103s. ing. In this open / close device input state, the opening spring 104 is compressed and stored between the spring receiving seat 108 and the spring receiving fixing member 109.

  FIG. 2 shows a state in which the switchgear is shut off. The movable contact driving rod 107m is moved to the left side in the figure by the stored energy of the opening spring 104. The opening spring 104 is extended and is in a deenergized state. Is in contact with the surface of the spring receiver fixing member 109 opposite to the open spring 104, and the movable contact 103m is separated from the fixed contact 103s.

  The operation from the switchgear shut-off state of FIG. 2 to the switchgear switch-on state of FIG. 1 is performed by turning on the drive circuit 106 in response to the turn-on command. 2 and the movable element 102 is attracted to both the coils 1 and 2 by the electromagnetic attraction force of both the coils 1 and 2, and the movable contact driving rod 107m associated with the attraction of the movable element 102 to the two coils 1 and 2 The release spring 104 is compressed and stored through the spring seat 108 by the movement in the right direction in the figure (movement to the fixed contact side), and the movement of the movable contact drive rod 107m in the right direction in the figure (to the fixed contact side). ), The movable contact 103m comes into contact with the fixed contact 103s.

  The operation from the switch-on state of FIG. 1 to the switch-off state of FIG. 2 is caused by an abnormal operation of the main circuit to which the switch 103 is connected or an operation of turning on the drive circuit 106 by human operation. Stored energy is supplied to the closing / coiling shared coil 2 with a polarity opposite to that at the time of charging, and by supplying this reverse polarity, the closing / coiling coil 2 receives an electromagnetic force having a polarity opposite to the magnetic field of the permanent magnet 105. The movable element 102 is pulled away from the permanent magnet 105 by the generated reverse polarity electromagnetic force and the stored energy of the release spring 104 stored at the time of application, and moves to the left side of the figure to move to the spring receiving fixing member 109. The movable contact 103m is moved from the fixed contact 103s by the movement of the movable contact driving rod 107m to the left side of the drawing as the movable element 102 moves. It can isolated to block action.

  That is, the electromagnetic operating device of the opening / closing device includes a movable contact driving rod 107m for driving the movable contact 103m, an annular dedicated coil 1 through which the movable contact driving rod 107m is concentrically penetrated, and this dedicated coil 1 An annular closing / breaking shared coil 2 adjacent to the movable contact 103m side and through which the movable contact driving rod 107m is concentrically penetratingly moved, and the closing / closing shared coil 2 is adjacent to the movable contact 103m side. When the magnet 105 and the movable contact driving rod 107m are attached and the closing coil 1 and the closing / breaking shared coil 2 are energized when the switching device is turned on, both the closing dedicated coil 1 and the closing / breaking shared coil 2 are electromagnetic. It is sucked by the force and moves in the closing coil 1 and the closing / shutoff shared coil 2 A magnetic mover 102 that is attracted to a permanent magnet 105 and puts the movable contact 103m into the fixed contact 103s via the movable contact driving rod 107m, and one end is fixed to the movable contact driving rod 107m and the other end is fixed. An open spring 104 fixed to the spring receiver fixing member 109 and compressed and accumulated through the movable contact driving rod 107m and the spring receiver fixing member 109 by the movement of the movable element 102 when the opening / closing device is turned on, When the switchgear is shut off, the closing / shut-off shared coil 2 is biased in the opposite polarity to that when the switchgear is turned on, and the electromagnetic force of the closing / shut-off shared coil 2 biased to this reverse polarity and the opening compressed when the switch is turned on. The movable element 102 moves in the direction opposite to that at the time of closing by the stored energy release output of the spring 104, and the movable element 102 Serial movable contact 103m via the movable contact drive bar 107m by the movement of the closing time of the reverse direction to the blocking action away from the fixed contact 103s.

  The closing coil 1 and the closing / breaking shared coil 2 are energized by the discharge energy of the closing drive capacitor 5 when the switchgear is turned on. The reverse polarity is urged by the discharge energy of the blocking drive capacitor 6.

  When the switchgear is turned on, the energy stored in the closing drive capacitor 5 is supplied to the closing coil 1 and the closing / shut-off common coil 2, and the mover 102 is moved to both the coils 1, 2 by the electromagnetic attractive force of both the coils 1, 2. When the movable contact driving rod 107m is moved to the right in the figure (moving to the fixed contact side) in accordance with the suction of the movable element 102 to the two coils 1 and 2, the release spring 104 causes the spring seat 108 to move. Further, when the switchgear is shut off, the stored energy of the shut-off drive capacitor 6 is supplied to the closing / coiling shared coil 2 in the opposite polarity to that at the time of closing, and this reverse polarity is stored. The electromagnetic force having the opposite polarity to the magnetic field of the permanent magnet 105 is generated in the common coil 2 for turning on / off, and the generated electromagnetic force having the opposite polarity is stored at the time of turning on. Since the movable element 102 is separated from the permanent magnet 105 by the stored energy of the release spring 104, it is assumed that the closing drive capacitor 5 has a larger capacitance than the blocking drive capacitor 6. is there.

  Next, FIGS. 3 and 5 will be described. The circuit shown in FIGS. 3 and 5 includes a closing coil 1, a closing / breaking shared coil 2, coil switching relays 3 and 4, a closing driving capacitor 5, a blocking driving capacitor 6, a first closing switch 7, 2 switch 8, cutoff switch 9, diodes 10, 11, 27, current attenuation resistors 12, 13, 26, current attenuation capacitors 14, 15, 16, 17, capacitor voltage dividing resistors 18, 19, 20 , 21, first induced electromotive force suppressing switch 22, second induced electromotive force suppressing switch 23, discharge resistors 24, 25, the switches 7, 8, 9, 22, 23 and the coil switching relay 3. , 4 are connected by connecting the control circuit 28 in which the operation sequence is set as shown in the figure.

  The coil switching relays 3 and 4, the first closing switch 7, the second closing switch 8, the cutoff switch 9, the diodes 10, 11 and 27, the current attenuation resistors 12, 13 and 26, the current attenuation Capacitors 14, 15, 16, and 17, capacitor voltage dividing resistors 18, 19, 20, and 21, a first induced electromotive force suppression switch 22, a second induced electromotive force suppression switch 23, discharge resistors 24 and 25, The control circuit 28 is mounted on a common substrate.

The closing operation from the circuit state at the time of interruption in FIG. 5 to the circuit state at the time of closing in FIG. 3 is performed as follows by a control signal based on the operation sequence of the control circuit 28.
In order to supply energy from the input drive capacitor 5 to the input coil 1 and the input / cutoff common coil 2, the coil switching relays 3 and 4 are operated to the contact A side, and the first and second input switches 7, 8 is turned on, and immediately after that, the first and second induced electromotive force suppression switches 22 and 23 are turned on.
After the closing operation is completed, the first and second closing switches 7 and 8 are turned OFF, and the energy supply from the closing driving capacitor 5 to the closing dedicated coil 1 and the closing / shutoff shared coil 2 is stopped.
After stopping the energy supply from the input drive capacitor 5 to the input dedicated coil 1 and the input / cutoff common coil 2, the energy accumulated in the input dedicated coil 1 and the input / disconnection common coil 2 as electromagnetic energy becomes current energy and becomes a diode. 10 and 11, attenuated by the current attenuating resistors 12 and 13, and accumulated in the current attenuating capacitors 14, 15, 16 and 17.
After the energy stored in the dedicated coil 1 and the shared coil 2 for switching on / off is transferred to the current attenuating capacitors 14, 15, 16, 17, the induced electromotive force suppression switch is turned off, and the current attenuating capacitor The energy stored in 14, 15, 16, and 17 is gradually attenuated by the discharge resistors 24 and 25.

  (1) Operation timings of the relays 3 and 4 for switching the coil, (2) Operation timings of the first and second switching switches 7 and 8, and (3) First and second induction The operation timing of the power suppression switches 22 and 23 and (4) the operation timing of the cutoff switch 9 are illustrated in FIG.

The interruption operation from the circuit state at the time of turning on in FIG. 3 to the circuit state at the time of interruption in FIG. 5 is performed as follows by a control signal based on the operation sequence of the control circuit 28.
In order to supply energy from the cutoff drive capacitor 6 to the closing / breaking shared coil 2, the coil switching relays 3 and 4 are returned to the contact B side, and the cutoff switch 9 is turned on.
After the shut-off operation is completed, the shut-off switch 9 is turned OFF to stop the energy supply from the shut-off drive capacitor 6 to the closing / shut-off common coil 2.
After the supply of energy from the cutoff drive capacitor 6 to the on / off common coil 2 is stopped, the energy stored in the on / off common coil 2 as electromagnetic energy becomes current energy. The current energy is attenuated by a loop circuit formed by the input / cut-off shared coil 2, the diode 27, and the current attenuation resistor 26.

  (1) Operation timing of the relays 3 and 4 for switching the coil, (2) Operation timing of the first and second switch 7 and 8 for switching, (3) First and second induction The operation timing of the power suppression switches 22 and 23 and (4) the operation timing of the cutoff switch 9 are illustrated in FIG.

3 and 5, a first energization circuit is formed by a circuit of a first closing switch 7 connected in series to the closing coil 1.
Further, a second energization circuit is formed by a circuit of a second making switch 8 connected in series to the making / breaking shared coil 2 via a coil switching relay 4.
In addition, a third energization circuit is formed by a circuit of a cutoff switch 9 connected in series to the common coil 2 for turning on / off via coil switching relays 3 and 4.

3 and 5, the diode 10, the current attenuating resistor 12, the current attenuating capacitors 14 and 16, and the first attenuating coil 1 connected in series and connected in parallel to the first energizing switch 7. A first attenuating circuit is configured by a series connection circuit with the induced electromotive force suppressing switch 22.
Further, a diode 11, a current attenuating resistor 13, a current attenuating capacitor 15, which are connected in series to the on / off common coil 2 via the coil switching relays 3 and 4 and connected in parallel to the second on / off switch 8, A second attenuating circuit is constituted by a series connection circuit of 17 and the second induced electromotive force suppressing switch 23.
Further, a third attenuation is achieved by a series connection circuit of a diode 27 and a current attenuating resistor 26 which are connected in series to the on / off common coil 2 via the coil switching relays 3 and 4 and connected in parallel to the cutoff switch 9. A circuit is configured.

  The energy stored in the current attenuating capacitors 14 and 16 connected in series in the first attenuation circuit is converted into a capacitor by the second operation (OFF operation) of the corresponding first induced electromotive force suppression switch 22. 14 and 16 are attenuated by a discharge resistor 24 connected in parallel.

  The energy accumulated in the current attenuating capacitors 15 and 17 connected in series of the second attenuation circuit is converted into the capacitor by the second operation (OFF operation) of the corresponding second induced electromotive force suppression switch 23. 15 and 17 are attenuated by a discharge resistor 25 connected in parallel.

  In other words, the drive circuit of the switchgear described above performs the switchgear insertion by the dedicated coil 1 that is energized when energized and the common coil 2 that is energized and energized when energized. An opening / closing device drive circuit which is energized when the common coil 2 is energized with a polarity opposite to that of the opening / closing of the opening / closing device, and shuts off the opening / closing device in cooperation with an opening spring 104 (see FIGS. 1 and 2). The first energizing circuit that supplies the charging energy of the charging drive capacitor 5 to the dedicated coil 1 by the first operation of the first charging switch 7 when the switch is turned on, and the charging energy of the charging drive capacitor 5 when the switchgear is turned on Is switched off when the switching device is shut off, and the second energization circuit for supplying the power to the closing / coilating coil 2 by the first operation of the second closing switch 8 and the first operation of the coil switching relays 3 and 4 A third energization circuit for supplying charging energy of the dynamic capacitor 6 to the reverse polarity coil 2 by the first operation of the cutoff switch 9 and the second operation of the coil switching relays 3 and 4. It is equipped with.

In the case of Patent Document 1, the consumption speed of electromagnetic energy is determined by the resistance and the time constant of the coil. Therefore, if the resistance is increased, the consumption speed is improved. However, since the surge generated by increasing the resistance is increased, it is not possible to select a resistance that generates a surge exceeding the withstand voltage of the switch element. In the circuit of the present embodiment, the energy consumption rate is determined by the time constants of the capacitors 14, 16, 15, and 17 and the dedicated coil 1. Even when the time constant is adjusted by the capacity of the capacitors 14, 16, 15, and 17, the generated surge does not change, so the energy consumption speed is improved by using the capacitor to consume the energy stored in the dedicated coil 1. We were able to.
Further, in the present embodiment, the switch performance limit that the current that flows in the dedicated coil 1 that is the subject of Patent Document 1 cannot be higher than the performance of the switch that controls the energy flowing from the input drive capacitor 5 to the coil. The load-side circuit is composed of the first energization circuit, the first attenuation circuit, the second energization circuit, and the second attenuation circuit, and the load on the switch in each circuit can be suppressed. It was.

1 Dedicated coil,
2 Coil for turning on / off,
3, 4 Coil switching relay,
5 Input drive capacitor,
6 Drive capacitor for shutoff,
7 First input switch,
8 Second input switch,
9 Shut-off switch,
10, 11, 27 diode,
12, 13, 26 Current attenuation resistor,
14, 15, 16, 17 Current attenuating capacitors,
18, 19, 20, 21 Capacitor voltage dividing resistor,
22 1st induced electromotive force suppression switch,
23 Second induced electromotive force suppressing switch,
24,25 discharge resistance,
28 control circuit,
100 switchgear,
101 electromagnetic operation mechanism,
102 mover,
103 Switch,
103m movable contact,
103s fixed contact,
104 Opening spring,
105 permanent magnets,
106 drive circuit,
107m movable contact drive rod,
107s fixed contact support rod,
108 Spring seat,
109 Spring receiving fixing member.

Claims (8)

A movable contact driving rod for driving the movable contact;
An annular dedicated coil through which this movable contact drive rod penetrates concentrically to move,
An annular closing / coiling coil that is adjacent to the movable contact side of the dedicated coil for insertion and through which the movable contact driving rod is concentrically penetrated.
A permanent magnet adjacent to the movable contact side, the movable contact drive rod attached to the closing / coiling coil, and the closing coil and the closing / coiling coil are energized when the switchgear is turned on. The movable contact is attracted by the electromagnetic force of both the closing / breaking coil and moved in the closing dedicated coil and the closing / coiling coil, and is attracted to the permanent magnet, and the movable contact becomes a fixed contact via the movable contact driving rod. A magnetic mover to be inserted, and one end fixed to the movable contact drive rod and the other end fixed to a fixed spring support fixing member. An open spring that is compressed and stored through the spring support fixing member;
When the switchgear is shut off, the closing / shutdown common coil is biased in the opposite polarity to that when the switchgear is turned on. The movable element moves in a direction opposite to that at the time of insertion by the stored energy release output, and the movable contact moves away from the fixed contact through the movable contact driving rod by movement of the movable element in the direction opposite to that at the time of insertion. An electromagnetic operating device for an opening / closing device that performs a blocking operation In the electromagnetic operating device of the switchgear according to claim 1,
The dedicated coil for input and the shared coil for closing / cutting are energized by the discharge energy of the driving capacitor for charging when the switchgear is turned on,
The electromagnetic operating device for a switchgear, wherein the closing / coiling shared coil is biased to the reverse polarity by the discharge energy of the cutoff drive capacitor when the switchgear is shut off. In the electromagnetic operating device of the switchgear according to claim 2,
An electromagnetic operating device for a switchgear, wherein a capacitance of a driving capacitor for charging is larger than a capacitance of the blocking driving capacitor. The switchgear is turned on by a dedicated coil that is energized when energized and a common coil that is energized and shut off when energized, and the coil that is turned on and off is energized in the opposite polarity to that of the switchgear. Then, the drive circuit of the switchgear that is energized and cooperates with the opening spring to shut off the switchgear,
A first energization circuit for supplying charging energy of the charging drive capacitor to the dedicated coil by the first operation of the first switching switch when the switchgear is turned on;
A second energization circuit for supplying charging energy of the input driving capacitor to the input / cut-off shared coil by the first operation of the second input switch and the first operation of the coil switching relay when the switchgear is turned on; A third energization circuit that supplies the charging energy of the cutoff drive capacitor to the reverse polarity coil to the on / off shared coil by the first operation of the cutoff switch and the second operation of the coil switching relay when the switchgear is shut off A drive circuit for a switchgear comprising: In the drive circuit of the switchgear according to claim 4,
A first attenuation circuit for attenuating the energy stored in the dedicated coil by the first operation of the first induced electromotive force suppression switch during the second operation of the first switch;
A second attenuation circuit for attenuating the stored energy of the on / off shared coil by the first operation of the second induced electromotive force suppression switch during the second operation of the second on switch; and A third attenuating circuit for attenuating the stored energy at the time of supplying the reverse polarity of the on / off shared coil via the coil switching relay in the second operating state by the second operation of the switch for power supply A drive circuit for a switchgear characterized by comprising: In the drive circuit of the switchgear according to claim 5,
The drive circuit for a switchgear, wherein the first attenuation circuit and the second attenuation circuit are each attenuated by a plurality of current attenuation capacitors connected in series. In the drive circuit of the switchgear according to claim 6,
The energy stored in the current attenuating capacitor connected in series to each of the first attenuating circuit and the second attenuating circuit is the second operation of the corresponding first induced electromotive force suppressing switch and A switch circuit driving circuit, wherein the second induced electromotive force suppression switch is attenuated by a discharge resistor connected in parallel to the corresponding plurality of current attenuating capacitors by the second operation of the second induced electromotive force suppressing switch. In the drive circuit of the switchgear according to any one of claims 5 to 7,
The first energization circuit, the second energization circuit, the third energization circuit, the first attenuation circuit, the second attenuation circuit, and the third attenuation circuit are mounted on a common substrate. A drive circuit for a switchgear characterized by comprising: