JP2001256868A - Operating apparatus for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control velocity of a movable member at the time of closing operation and breaking operation. SOLUTION: A magnetic circuit comprises a fixed member; a permanent magnet: the movable member; and an electromagnet 9 wherein a reactor 23, which is electrically connected in series with the electromagnet, is provided in a position not interlinking with a magnetic flux of the magnetic circuit. Thereby, at the time of closing or breaking operation, when the magnetic flux of the magnetic circuit is changed and a counterelectromotive current is induced in the electromagnet, by discharging the energy accumulated in the reactor, a decline of excited current of the electromagnet generated by the counterelectromotive current is compensated. thus the decline of moving velocity of the movable member at the time of closing or breaking can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a circuit breaker which performs opening and closing operations of a vacuum switching device such as a vacuum valve by using an electromagnetic actuator in which a permanent magnet and an electromagnet are combined. The present invention relates to a circuit breaker operating device capable of controlling the excitation driving force of the circuit breaker substantially constant.

[0002]

2. Description of the Related Art Conventionally, as a circuit breaker operating device for opening and closing a vacuum switching device such as a vacuum valve, a mechanical device has been widely used. However, in recent years,
Electromagnetic actuators that combine permanent magnets and electromagnets in place of mechanical ones have many advantages, such as simplicity of structure, small number of parts, and non-mechanical, so there is no wear of parts. It is being used gradually.

As this type of electromagnetic actuator, for example, many configurations have been proposed in addition to the configuration disclosed in Japanese Patent Application No. 10-59557. However, basically, in a state in which the closing state or the closing state of the vacuum switching device is maintained by the attraction force of the permanent magnet or the pressing force of the spring, the electromagnet is excited to perform the closing operation or the closing operation. I have.

FIG. 13 is a schematic diagram showing a typical configuration of such an electromagnetic actuator. This electromagnetic actuator 1
Is a movable contact 3 of the vacuum valve 3 attached to the support frame 2 and having a fixed contact 3a and a movable contact 3b.
b is connected via an insulating operation rod 4 coaxially connected.

The operating rod 4 is supported movably in the axial direction while penetrating through a fixing member 5 having an internal space. The fixed member 5 is made of a magnetic material, and a movable member 6 made of a magnetic material fixed to the operation rod 4 is arranged inside the fixed member 5 so as to be able to linearly move in the axial direction.

A permanent magnet 7 is arranged inside the fixed member 5 so as to surround the movable member 6, and an electromagnet 9 is provided inside a magnetic circuit 8 formed by the movable member 6, the permanent magnet 7 and the fixed member 5. Are located. The electromagnet 9 is capable of attracting and exciting the permanent magnet 7 when turned on and repulsive exciting when shut off, by means of an excitation power supply circuit (not shown).

Further, a spring 10 is attached between the lower end of the operating rod 4 and the fixing member 5 so as to be externally inserted into the operating rod 4 and urge the operating rod 4 downward. Further, a spring 11 is attached between the fixing member 5 and the vacuum valve 3 so as to be similarly externally inserted into the operation rod 4 and urge the operation rod 4 downward. In addition,
Each of the springs 10 and 11 urges the operating rod 4 downward to separate the movable contact 3b of the upper vacuum valve 3 from the fixed contact 3a to obtain a closed state.

FIG. 13 shows the closed state of the vacuum valve 3. In the closed state, the movable member 6 is attracted to the upper permanent magnet 7, and the springs 10 and 11 are compressed, so that the closed state of the fixed contact 3a and the movable contact 3b is maintained.

The closed state and the closed state are controlled by controlling the energizing direction of the electromagnet 9 disposed in the magnetic circuit 8 so that the magnetic force (upward attraction) acting on the movable member 6 and the spring force (downward biasing force (repulsive force) are applied. )) Can be switched by changing the magnitude relationship between them.

FIG. 14 shows the relationship between the electromagnetic force acting on the movable member 6 and the spring force. 14, the horizontal axis represents the stroke of the movable part (the gap distance between the movable member 6 and the fixed member 5), and the vertical axis represents the force acting on the movable member 6.

Further, three curves 12a to 12c show the suction force for sucking the movable member 6 upward. here,
Curve 12a shows the attraction (magnetic force) of the permanent magnet alone, curve 12b shows the attraction when the electromagnet 9 is energized in the reverse direction, and curve 12c shows the attraction when the electromagnet 9 is energized in the forward direction. Here, two curves 12 related to the energization direction
b and 12c are obtained with the ampere turn of the electromagnet 9 being constant.

On the other hand, a step-shaped bent line 13 indicates the repulsive force of the springs 10 and 11 for urging the operation rod 4 downward. The repulsive force of the spring is determined by the combination of the springs 10 and 11
It changes stepwise when shifting from the closing state to the closing state.

That is, FIG. 14 shows that the vacuum valve 3 is in a closed state or a closed state according to the magnitude relationship between the curves 12a to 12c indicating the upward suction force and the broken line 13 indicating the downward repulsive force. Indicates that

For example, in the closed state, the attraction force 12a of the permanent magnet 7 is larger than the spring force of the broken line 13, so that the springs 10, 11 are compressed only by the attraction force of the permanent magnet 7, and the two contacts 12a, 12b Is maintained in the closed state.

Next, when the electromagnet 9 is energized in the reverse direction, the attractive force of the magnetic circuit 8 decreases to the value shown by the curve 12b. As a result, the repulsive force of the springs 10 and 11
, The movable member 6 moves downward, and the two contacts 3a and 3b are separated from each other to shift to a blocking state (blocking operation).

In this cut-off state, since the broken line 13 of the repulsive force of the springs 10 and 11 is larger than the curve 12a of the attraction force of the permanent magnet 7 alone, the open state where both contacts 3a and 3b are separated is maintained. I do.

Next, when the electromagnet 9 is energized in the forward direction, the attractive force of the magnetic circuit 8 increases to the value shown by the curve 12c. As a result, the repulsive force of the springs 10 and 11
The movable member 6 moves upward (injection operation) to reduce the upward suction force, and the two contacts 3a and 3b come into contact with each other while compressing the springs 10 and 11 to shift to the input state.

Next, a description will be given of the energizing operation when switching between the closed state and the closed state with reference to FIG. 15 taking the example of Japanese Patent Application No. 11-169967 proposed by the present inventors as an example. This description corresponds to the above-described excitation power supply circuit of the electromagnet 9. First, power from a main power supply (power supply source such as a commercial AC power supply) 14 is supplied to a transformer 15, which transforms the power into a power suitable for exciting the electromagnet 9. The transformed electric power is rectified into direct current by the rectifier 16 and the smoothing device 17 and bridge-connected to the excitation excitation contacts 21a and 21b and the cut-off excitation contact 22.
a, 22b, any of the excitation contacts 21a, 21b
The electromagnet 9 at the center of the bridge is excited in the forward direction (closing operation) or in the reverse direction (cutoff operation) via 1b or 22a, 22b.

Here, when one end of the electromagnet 9 is set to point A and the other end is set to point B, a case where a current flows from the point A to the direction of the point B is defined as forward energization. A case where a current flows through the point A is defined as a reverse direction current.

At this time, in forward energization, current is applied from point A to point B by closing the closing excitation contacts 21a and 21b to form a circuit indicated by a solid line s, and an excitation driving force is generated in the closing direction. The vacuum valve 3 shifts to a closed state.

In the case of reverse energization, the cut-off excitation contact 22
Due to the closing of the poles a and 22b, current is supplied from point B to point A, and a circuit indicated by a broken line d is established. Excitation driving force is generated in the blocking direction, and the vacuum valve 3 shifts to the blocking state.

It is necessary to design the energizing time and the current value of the forward energization or the reverse energization so as to maintain an appropriate speed represented by the input point speed or the initial opening speed.

[0023]

However, in the circuit breaker operating device as described above, there is a need for an improvement in the control of the excitation driving force at the time of closing or at the time of shutting down in accordance with the following several possibilities. . For example, when the electromagnet 9 is excited and the movable member 6 starts to move, the magnetic flux in the magnetic circuit 8 changes and Lenz's law (the direction of the induced electromotive force caused by the change in the flux linkage of the coil changes according to the magnetic flux change). Occurs in a direction that obstructs the electromagnet 9), a back electromotive current is generated in the electromagnet 9 and the exciting current of the electromagnet 9 decreases. For this reason, there is a possibility that a sufficient speed cannot be given to the movable member 6 at the start of the shut-off operation requiring a large opening speed.

In the shut-off state, since the gap distance between the movable member 6 and the fixed member 5 is large, the electromagnetic force acting on the movable member 6 is relatively small as shown in FIG. Therefore, it is necessary to supply a relatively large current to the electromagnet 9 at the start of the closing operation.

However, when the closing operation is started, the gap distance is shortened and the electromagnetic force is increased, and the movable member 6 is gradually accelerated, so that the movable contact 3b contacts the fixed contact 3a at an excessive speed. There is a possibility that both contacts 3a and 3b may be damaged.

The present invention has been made in view of the above circumstances, and has as its object to provide a circuit breaker operating device capable of appropriately controlling the moving speed of a movable member during a closing operation or a closing operation.

[0027]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an operating device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact which are provided so as to be able to contact and separate. An insulative operating rod fixed to the movable contact and held movably in a direction to move the movable contact toward and away from the fixed contact; and a magnetic material fixed to the operating rod. A movable member, an electromagnet attached to the movable member, a fixed member that movably holds the operation rod while accommodating the electromagnet and the movable member therein,
The movable member is disposed inside the fixed member so as to face the movable member,
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. And a power supply circuit for exciting the electromagnet, and the following technology is added to the circuit breaker operating device.

According to a first aspect of the present invention, there is provided a magnetic circuit comprising the fixed member, the permanent magnet, the movable member, and the electromagnet, which is not linked to a magnetic flux, and electrically connected to the electromagnet in series. It is a configuration provided with a reactor that is provided.

Here, the reactor may be arranged on any one of a current path during a closing operation, a current path during a breaking operation, and a common current path during both operations.

Next, according to a second aspect of the present invention, both ends of the electromagnet are electrically connected to each other, and the electromagnet is excited over the entire section so as to move the movable member in the closing direction. A plurality of closing excitation contacts for electrically connecting one end of the electromagnet to the one end and the intermediate tap, respectively, and moving the electromagnet in a section from the intermediate tap to one end so as to move the movable member in the blocking direction. And a plurality of cut-off excitation contacts for exciting over the same.

Here, as a method of exciting the electromagnet over the entire section at the time of the closing operation and exciting the electromagnet over the section from the intermediate tap to one end at the time of the breaking operation, the exciting contacts are provided as described above. In addition to the method of switching the current path,
A method of connecting a diode to switch a current path has become available.

Next, a third aspect of the present invention is directed to a back electromotive current generating coil installed at a position interlinked with a magnetic flux of a magnetic circuit including the fixed member, the permanent magnet, the movable member and the electromagnet. It is a configuration provided with.

Here, a diode may be connected between the ends of the back electromotive current generating coil for controlling the back electromotive current.

Next, according to a fourth aspect of the present invention, the electromagnet includes a plurality of electromagnets connected in parallel with each other, and is connected to one end of one of the electromagnets. A closing excitation contact is controlled when the movable member is moved in the closing direction, and is controlled to be open when the movable member is moved in the closing direction.

Here, instead of the closing excitation contact, a forward direction connection is made to one end of one of the electromagnets so that an exciting current for moving the movable member in the closing direction flows. May be provided.

(Operation) Therefore, according to the first aspect of the present invention, by taking the above-described means, the reactor arranged at a position that does not interlink with the magnetic flux of the magnetic circuit can be used when the exciting current decreases. Since the exciting current is controlled to be substantially constant by releasing energy in accordance with the decrease, the moving speed of the movable member during the closing operation or the closing operation can be appropriately controlled.

Next, according to a second aspect of the present invention, an intermediate tap is provided on the electromagnet, the electromagnet is excited over the entire section during the closing operation, and the electromagnet is excited over the section from the intermediate tap to one end during the shutoff operation. In the closing operation, a large electromagnetic force to oppose the repulsive force of the elastic member is obtained, and in the shut-off operation, a small electromagnetic force that only utilizes the repulsive force of the elastic member is obtained. It is possible to appropriately control the moving speed of the movable member at the time of the operation or the breaking operation.

Next, a third aspect of the present invention is to provide a counter electromotive current generating coil installed at a position interlinked with the magnetic flux of the magnetic circuit so as to reduce an excessive moving speed at the time of a closing operation or a breaking operation. As a result, a back electromotive force is generated to reduce the exciting current of the electromagnet, so that the moving speed of the movable member during the closing operation or the closing operation can be appropriately controlled.

Next, according to a fourth aspect of the present invention, the electromagnet is constituted by a plurality of electromagnets connected in parallel to each other, and all the electromagnets are excited during the closing operation, and none of the electromagnets is excited during the shutoff operation. With the configuration, a large electromagnetic force for opposing the repulsive force of the elastic member is obtained at the time of the closing operation, and a small electromagnetic force sufficient to utilize the repulsive force of the elastic member is obtained at the time of the breaking operation. The moving speed of the movable member during the shutoff operation can be appropriately controlled.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the moving speed of the movable member during the closing operation or the closing operation is appropriately controlled, but the specific method is different. (First Embodiment) FIG. 1 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a first embodiment of the present invention. Detailed description is omitted, and different portions are mainly described here. That is, in the present embodiment, the excitation driving force is controlled to be substantially constant. Specifically, a first series circuit of the positive-side closing excitation contact 21a and the negative-side interruption excitation contact 22b, -Side shut-off excitation contact 22a and negative-side closing excitation contact 2
1b and the second series circuit are connected in parallel with each other, and a connection point Pa between the two contacts 21a and 22b in the first series circuit.
In the above-described excitation switching circuit in which the electromagnet 9 is connected between the contact point Pb between the two contacts 22a and 21b in the second series circuit, the reactor is connected between the connection point Pa and the point A of the electromagnet 9. 23.

Here, the reactor 23 is connected in series with the electromagnet 9 at a position that does not link with the magnetic flux in the magnetic circuit 8 described in FIG.

Although the electromagnet excitation power supply 24 for supplying power to the excitation switching circuit is represented by a battery symbol in FIG. 1, it is not limited to a DC power supply such as a battery, but may rectify an AC current as shown in FIG. An excitation power supply circuit or the like which is smoothed and converted to DC may be used. That is, the electromagnet excitation power supply 24 may be any power supply that can supply a current for exciting the electromagnet 9.

Although the closing excitation contacts 21a and 21b and the cut-off excitation contacts 22a and 22b are represented by the symbols of mechanical contacts in FIG. 1, the invention is not limited thereto, and switching semiconductors such as transistors and thyristors may be used.

The case where the electromagnet 9 is energized in the direction from the point A to the point B (the case where the electromagnet 9 generates an electromagnetic force in the direction of increasing the electromagnetic attraction force of the fixed member 5 with respect to the movable member 6) is referred to as energization excitation. .

Further, when the electromagnet 9 is energized in the direction from the point B to the point A (when an electromagnetic force (not shown) is generated from the electromagnet 9 in a direction to decrease the electromagnetic attraction of the fixed member 5 with respect to the movable member 6), the excitation is cut off. Called.

Next, the operation of the circuit breaker operating device configured as described above will be described. To energize the electromagnet 9, the circuit shown by the solid line s in FIG. 1 is established by closing the closing excitation contacts 21 a and 21 b and opening the shut-off excitation contacts 22 a and 22 b, Excitation is performed while energy is being stored.

In order to excite the electromagnet 9,
By closing the closing excitation contacts 22a and 22b and opening the closing excitation contacts 21a and 21b, the circuit shown by the broken line d in FIG. 1 is established, and the breaking excitation is performed while storing energy in the reactor 23. .

Next, when the movable member 6 shown in FIG. 7 and thereafter starts moving in the closing direction, assuming that the inductance of the electromagnet 9 is L and the resistance is R, this electromagnet 9 has the following equation (1). A back electromotive voltage v is generated.

V = −L (di / dt) (1) Accordingly, the exciting current to the electromagnet 9 decreases by the value of the back electromotive current i shown in the following equation (2), and Decrease the moving speed.

I = v / R (2) This is the same even when the movable member 6 starts moving in the blocking direction.

Next, when the exciting current to the electromagnet 9 decreases due to the back electromotive current i, the energy stored in the reactor 23 starts to be released according to the time constant of the reactor 23 in order to maintain the balance of the circuit. That is, energy is released from reactor 23 to compensate for the decrease in the exciting current, and the exciting current is supplied. When the energy of the back electromotive current i corresponding to the decrease of the exciting current is released, the energy is balanced with the normal exciting current value of the electromagnet 9, and the emission of energy from the reactor 23 ends.

As described above, according to the present embodiment, the moving speed of the movable member 6 is reduced when the magnetic flux of the magnetic circuit 8 changes at the time of the closing operation or the breaking operation and the back electromotive force i is induced in the electromagnet 9. The decrease in the exciting current due to the back electromotive current i is compensated for by the release of energy from the reactor 23, and the exciting current is controlled to be substantially constant, so that the moving speed of the movable member 6 can be made substantially constant. The closing speed or the closing speed can be realized.

(Second Embodiment) FIG. 2 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a second embodiment of the present invention. The present embodiment is a modification of the first embodiment, and aims at controlling the excitation driving force to be substantially constant during the closing operation. Specifically, the position of the reactor 23 is changed, and It is configured to be connected between the positive excitation contact 21a on the positive side and the connection point Pa.

Here, the reactor 23 is, as described above,
It is arranged at a position that does not interlink with the magnetic flux in the magnetic circuit 8 described in FIG. The condition that the magnetic circuit 8 is arranged at a position that does not interlink with the magnetic flux is common to all the following embodiments.

The reactor 23 may be connected between the negative excitation contact 21b on the negative side and the connection point Pb. Next, the operation of the circuit breaker operating device configured as described above will be described. To turn on and excite the electromagnet 9,
By closing the closing excitation contacts 21a and 21b and opening the closing excitation contacts 22a and 22b, the circuit shown by the solid line s in FIG. 2 is established, and the excitation is performed while storing energy in the reactor 23.

In order to excite the electromagnet 9 in a cut-off manner,
By closing the shut-off excitation contacts 22a and 22b and opening the closing excitation contacts 21a and 21b, the circuit shown by the broken line d in FIG. 2 is established and the excitation is performed. However, in the cut-off excitation, the reactor 23 is not energized, so the reactor 23
Can't store energy.

Next, when the movable member 6 moves to the closing side and the exciting current to the electromagnet 9 is reduced by the back electromotive current, the exciting current is reduced according to the amount of the decrease in the reactor 23 as in the first embodiment. Replenished from.

Next, when the movable member 6 moves to the cutoff side, no exciting current is supplied because the reactor 23 does not exist in the circuit shown by the broken line d.

As described above, according to the present embodiment, only during the closing operation, the energy stored in the reactor 23 compensates for the decrease in the exciting current due to the back electromotive current i, and the moving speed of the movable member 6 is made substantially constant. Can be controlled. This embodiment can be applied to a case where the design of the magnetic circuit 8 is made with emphasis on the cutoff speed and the closing speed is insufficient.

(Third Embodiment) FIG. 3 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a third embodiment of the present invention. This embodiment is a modification of the first embodiment,
At the time of disconnection, the excitation driving force is controlled substantially constant. Specifically, the position of the reactor 23 is changed, and the reactor 23 is connected to the positive-side disconnection excitation contact 22a and the connection point Pb.
And is connected between them.

The reactor 23 may be connected between the negative exciting contact 22b and the connection point Pa. Next, the operation of the circuit breaker operating device configured as described above will be described. To cut off and excite the electromagnet 9,
By closing the shut-off excitation contacts 22a and 22b and opening the closing excitation contacts 21a and 21b, the circuit shown by the broken line d in FIG. 3 is established and the excitation is performed.

To turn on and excite the electromagnet 9,
By closing the closing excitation contacts 21a and 21b and opening the closing excitation contacts 22a and 22b, the circuit indicated by the solid line s in FIG. 3 is established, and the excitation is performed while storing energy in the reactor 23. However, in closing excitation, reactor 2
3 is not energized, so no energy is stored in the reactor 23.

Next, when the movable member 6 moves to the cutoff side and the exciting current to the electromagnet 9 decreases due to the back electromotive current, the exciting current is reduced according to the amount of the decrease in the reactor 23 as in the first embodiment. Replenished from.

Next, when the movable member 6 moves to the closing side, the exciting current is not supplied because the reactor 23 does not exist in the circuit shown by the broken line d.

As described above, according to the present embodiment, only during the cut-off excitation, the energy stored in the reactor 23 compensates for the decrease in the excitation current due to the back electromotive current i, and the moving speed of the movable member 6 is kept substantially constant. Can be controlled. Further, a sufficient shutoff speed required for opening the vacuum valve 3 can be obtained.

(Fourth Embodiment) FIG. 4 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a fourth embodiment of the present invention. In the present embodiment, the excitation driving force is optimized at the time of the closing excitation and at the time of the closing excitation, and more specifically, the intermediate tap 9t is placed at an arbitrary position between points AB at both ends of the electromagnet 9. Is provided, and the cut-off excitation contact 22c is connected between the point C at the end of the intermediate tap 9t and the connection point Pc (= Pb), while the closing excitation contact 21c is connected between the point B of the electromagnet 9 and the connection point Pb. Are connected.

Next, the operation of the circuit breaker operating device configured as described above will be described. When the electromagnet 9 is energized, the energizing contacts 21a, 21b, 21c are closed, and the shut-off energizing contacts 22a, 22b, 22c are opened, so that the electromagnet 9 can be moved from the point A to the point B. The circuit shown by the solid line s in FIG. 4 is established, and the electromagnet 9 generates an electromagnetic force in the closing direction.

When the electromagnet 9 is to be cut off and excited, the cut-off excitation contacts 22a, 22b and 22c are closed and the closing excitation contacts 21a, 21b and 21c are opened, so that the point A from the point C of the electromagnet 9 is reached. A circuit indicated by a broken line d in FIG. 4 between the points is established, and the electromagnet 9 generates an electromagnetic force in the cutoff direction.

Here, the length (the number of turns) of the electromagnet 9 in the path of the exciting current is different between when the excitation is applied and when the excitation is interrupted.
Are different, the value of the exciting current can be changed.

As described above, according to the present embodiment, a magnetic flux suitable for closing and closing can be obtained, so that an optimum operating speed in closing or closing of the movable member 6 can be obtained.

More specifically, an intermediate tap 9t is provided on the electromagnet 9 so that electricity is supplied to the entire section between the points A and B of the electromagnet 9 during the closing operation, and the intermediate tap 9t extends from the intermediate tap 9t of the electromagnet 9 during the shutoff operation.
By energizing the section up to the point, the number of turns of the electromagnet 9 can be properly used between the breaking operation and the closing operation.

Here, the position of the intermediate tap 9t of the electromagnet 9 is designed so as to obtain an optimum speed for cut-off excitation.

As shown in FIG. 14, the kinetic energy of the movable member 6 is obtained by releasing the energy stored in the springs 10 and 11 during the breaking operation, so that the exciting current to the electromagnet 9 is set to a relatively small value. it can.

Since the smaller the number of turns of the electromagnet 9 is, the more easily the back electromotive force i can be suppressed, only a part of the electromagnet 9 from the point A to the intermediate tap 9t is used during the cutoff operation.

On the other hand, during the closing operation, it is necessary to compress the springs 10 and 11 by exciting the electromagnet 9, so that relatively large energy is required. However, by energizing the entire section of the electromagnet 9, the number of turns is reduced. It can be maximized, and the exciting current can be suppressed to a value suitable for the control circuit.

(Fifth Embodiment) FIG. 5 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a fifth embodiment of the present invention. This embodiment is a modification of the fourth embodiment. Instead of the closing excitation contact 21c, a connection is made between the point B of the electromagnet 9 and the connection point Pb so that the exciting current at the time of closing is in the forward direction. Instead of the cut-off excitation limit diode 21d and the cut-off excitation contact 22c, the point C at the end of the intermediate tap and the connection point Pc (= P
b) the excitation limit diode 22 connected to the input side.
d.

Next, the operation of the circuit breaker operating device configured as described above will be described. When the excitation of the electromagnet 9 is performed, the closing excitation contacts 21a and 21b are closed and the cut-off excitation contacts 22a and 22b are opened, so that the electromagnet 9 between the point A and the point B in FIG. The circuit indicated by the solid line s is established.

When the electromagnet 9 is to be shut off and excited, the shutoff excitation contacts 22a and 22b are closed and the closing excitation contacts 21a and 21b are closed so that the electromagnet 9 can be moved from the point B to the point A. The circuit shown by the broken line d in FIG.

In addition, the current (solid line) at the time of energizing excitation is prevented from flowing from the intermediate tap 9t of the electromagnet 9 toward the point C by the energizing diode 22d. Similarly,
The current (broken line) at the time of the excitation is indicated by A,
The flow in the direction of the point C is blocked by the blocking-side excitation limiting diode 21d.

Here, when the excitation is applied, the closing-side excitation limiting diode 22d also goes in the forward direction. However, since the potential of the middle tap 9t of the electromagnet 9 is higher than that of the cathode of the closing-side excitation limiting diode 22d, the current is reduced. Does not flow,
Also in the case of cut-off excitation, the potential is higher at the point B of the electromagnet 9 and no current flows.
No recirculation of the exciting current occurs.

As described above, according to the present embodiment, the switching of the number of turns of the electromagnet 9 necessary for suppressing the exciting current to an appropriate value can be realized by the two diodes 21d and 22d. The tap switching does not require a disconnection mechanism using a mechanical contact or a switching semiconductor, and further eliminates the need for a control circuit for controlling those disconnection functions. For this reason, the electromagnet 9 suitable for closing and closing is provided by a tap switching function having a high-speed and simple configuration.
And the optimum operating speed of the movable member 6 during the closing operation or the closing operation can be obtained.

(Sixth Embodiment) FIG. 6 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a sixth embodiment of the present invention. This embodiment is a modification of the fifth embodiment, and aims to prevent mechanical damage to a movable member and the like.
Specifically, in the circuit configuration having the above-described intermediate tap and two diodes, each of the contacts 21a, 21b, 2
This is a system in which the opening and closing operations of 2a and 22b are changed.

That is, when the movable member 6 is moved from the blocking position to the closing position, the closing excitation contacts 21a and 21b are closed to start the closing excitation of the electromagnet 9, and thereafter,
A contact control circuit (not shown) having a function of opening the closing excitation contacts 21a and 21b before reaching the closing position is provided.

Next, the operation of the circuit breaker operating device configured as described above will be described. Make-up excitation contacts 21a, 21b
And the closing excitation contacts 22a and 22b are closed, so that an exciting current is supplied to the electromagnet 9 on the blocking side, and the movable member 6 starts operating in the blocking direction.

Next, during the operation of the movable member 6, when the cut-off excitation contacts 22a and 22b are opened, the point B of the electromagnet 9 passes through the cut-off excitation limit diode 21d and the closing-side excitation limit diode 22d. A closed circuit reaching the point C of the electromagnet 9 is formed.

In this closed circuit, since the movable member 6 is moving in the blocking direction, the magnetic circuit 8
The magnetic flux inside changes, and the change in the magnetic flux is induced in the coil portion between points C and B of the electromagnet 9, and an electromotive force (not shown) is induced such that an electromagnetic force (not shown) is generated in the closing direction. Thereby, the movement of the movable member 6 in the blocking direction is suppressed.

As described above, according to the present embodiment, even if the electromagnet 9 is excited with a considerable exciting current in order to obtain an appropriate initial shutoff speed, the electromagnet 9 can be moved to a mechanical constraint point (not shown) on the shutoff side. Since the braking force can be generated before the member 6 reaches, it is possible to prevent the movable member 6 and the mechanical components associated therewith from being mechanically damaged.

When the winding direction of the electromagnet 9 is reversed, a braking force can be applied when the movable member 6 is moved from the closing position to the closing direction. (Seventh Embodiment) FIG. 7 is a schematic diagram showing a magnetic circuit of a circuit breaker operating device according to a seventh embodiment of the present invention and its peripheral configuration. The present embodiment is intended to protect the mechanical parts by suppressing the excessive closing speed or the closing speed of the movable member 6, and specifically, a magnetic circuit including the permanent magnet 7, the fixed member 5 and the movable member 6. Is provided with a back electromotive current generating coil 26 arranged so as to interlink with the magnetic flux 25.

Here, the back electromotive current generating coil 26 may be a coil-shaped conductor formed by winding a conductive material at least once. For example, a conductive metal such as aluminum or copper is processed into a ring shape. A thing may be used. Next, the operation of the circuit breaker operating device configured as described above will be described. Now, the magnetic flux 2 generated by the permanent magnet 7, the fixed member 5, and the movable member 6
5 is present in the magnetic circuit. At this time, when the movable member 6 is operated by the excitation of the electromagnet 9 in the closing or closing direction, the amount of the magnetic flux 25 changes according to the change of the magnetic flux from the electromagnet 9 and the gap distance between the movable member 6 and the fixed member 5. I do.

Next, the induced current 2 is applied to the back electromotive current generating coil 26 by the magnetic flux 25 linked to the back electromotive current generating coil 26.
7 occurs.

The induced current 27 generates an electromagnetic force in a direction opposite to the moving direction of the movable member 6. This electromagnetic force acts as a braking force for the movable member 6 and suppresses an excessive closing speed or cutoff speed of the movable member 6. Therefore, the collision impact of the operation mechanism and the contacts 3a and 3b is reduced, and mechanical damage can be prevented.

As described above, according to the present embodiment, the back electromotive current generating coil 26 is linked to the magnetic flux in the magnetic circuit.
Is provided, a magnetic flux change generated by the movement of the movable member 6 is induced as an electromotive force in the back electromotive current generating coil 26, so that a braking force can be applied to the movable member 6, and a mechanical damper is provided. Etc. can be made unnecessary.

Therefore, for example, the collision speed between the movable part and the fixed part can be reduced in the final acceleration region of the breaking operation or the closing operation, and the life of the drive mechanism of the operating device can be extended. (Eighth Embodiment) FIG. 8 is a schematic diagram showing a magnetic circuit of a circuit breaker operating device according to an eighth embodiment of the present invention and a peripheral configuration thereof. The present embodiment is a modification of the seventh embodiment, and applies a braking force only at the time of a closing operation. Specifically, the induced current cutoff diode 21e connected in series to the back electromotive current generating coil 26 It has.

Here, the induced current cutoff diode 21e
Indicates that the induced current induced in the back electromotive current generating coil 26 during the closing operation flows in the forward direction.
6 are connected between the terminals.

Next, the operation of the circuit breaker operating device configured as described above will be described. Now, as described above, when the movable member 6 operates by exciting the electromagnet 9 in the closing or closing direction, the magnetic flux 25 is changed according to the change in the magnetic flux from the electromagnet 9 and the gap distance between the movable member 6 and the fixed member 5. The amount changes.

Next, the induced current 2 is applied to the back electromotive current generating coil 26 by the magnetic flux 25 linked to the back electromotive current generating coil 26.
7 occurs. The direction of the induced current 27 is opposite to the direction of the exciting current to the electromagnet 9 according to Lenz's law.

The induced current 27 generates an electromagnetic force in a direction opposite to the moving direction of the movable member 6. This electromagnetic force acts as a braking force for the movable member.

However, the induced current interruption diode 21e allows the induced current 27 to flow only when acting as a braking force during the closing operation, so that the braking force can be applied only when the movable member 6 moves in the closing direction.

As described above, according to the present embodiment, the induced current blocking diode 21e is connected so that the induced current induced in the back electromotive current generating coil 26 flows in the forward direction during the closing operation. The braking force can be applied only when the movable member 6 moves.

In other words, the induced current cutoff diode 21
By e, when the movable member 6 moves in the blocking direction, the electromotive force of the back electromotive current generating coil 26 is blocked, and the braking force on the movable member 6 can be prevented from being generated.

As a modified example of the present embodiment, as shown in FIG. 9, a configuration may be adopted in which the direction of the induced current blocking diode is reversed. In this case, since the induced current interruption diode 22e is connected so that the induced current induced in the back electromotive current generating coil 26 flows in the forward direction during the interruption operation, the braking force is applied only when the movable member 6 moves in the interruption direction. Can act.

In other words, in the configuration in which the back electromotive current generating coil 26 for applying a braking force when the movable member 6 moves is provided, the induced current interrupting diode 22e is provided so that the induced current 27 induced during the interruption operation flows in the forward direction. When the movable member 6 is moved in the closing direction, the electromotive force of the back electromotive current generating coil 26 is shut off, and the braking force on the movable member 6 can be prevented from being generated.

(Ninth Embodiment) FIG. 10 shows a ninth embodiment of the present invention.
It is a mimetic diagram showing a magnetic circuit of a circuit breaker operating device concerning an embodiment, and its peripheral composition. This embodiment is a modification of the seventh embodiment, in which a braking force is applied when the moving speed exceeds a predetermined value. Is connected to an effective induced voltage regulating diode 28 composed of two constant voltage diodes connected in series in opposite directions.

Here, the effective induced voltage regulating diode 28
Are a first constant voltage diode in which the induced voltage v of the back electromotive current generating coil 26 corresponding to the upper limit value of the closing speed is a breakdown voltage, and an induced voltage v corresponding to the upper limit value of the cutoff speed.
And a second constant voltage diode having a breakdown voltage.
Both constant voltage diodes may be provided as a set having the same breakdown voltage, or may be provided as a set having different breakdown voltages.

Next, the operation of the circuit breaker operating device configured as described above will be described. Now, as described above, the magnetic flux 25 generated in the magnetic circuit by the excitation of the electromagnet 9 and the change in the gap distance between the movable member 6 and the fixed member 5 are changed.
Is changed. At this time, an induced current 27 is generated in the back electromotive current generating coil 26 arranged so as to link with the magnetic flux 25, and a braking force acts on the movable member 6.

Here, the induced voltage v of the back electromotive current generating coil 26 in the interlinkage magnetic flux is represented by L, the inductance of the back electromotive current generating coil 26, the current i flowing through the back electromotive current generating coil 26, and the time t. Then, it is expressed by the following equation (3).

V = -L (di / dt) (3) The number of turns of the back electromotive current generating coil 26 is N, and the movable member 6
When the amount of movement is x and the amount of magnetic flux is φ, the following (4) to
From the equation (5), a portion where the change of the magnetic flux 25 is large (dφ /
dx: large) at high speed (dx / dt: large),
The induced voltage v described in equation (3) increases.

L = N ² (dφ / dt) (4) dφ / dt = (dφ / dx) (dx / dt) (5) Therefore, when the speed of the movable member 6 is low, the back electromotive current is generated. The induced voltage v of the generating coil 26 becomes equal to or lower than the breakdown voltage of the effective induced voltage regulating diode 28. Therefore, the induced current 27 of the back electromotive current generating coil 26 is cut off by the effective induced voltage regulating diode 28, so that a closed circuit is not established, and no braking force is generated on the movable member 6 by the induced current 27.

On the other hand, when the moving speed of the movable member 6 increases, the induced voltage v of the back electromotive current generating coil 26 exceeds the breakdown voltage of the effective induced voltage regulating diode 28. For this reason,
The effective induced voltage regulating diode 28 becomes conductive due to breakdown to form a closed circuit, and the induced current 27 generates a braking force on the movable member 6.

At this time, by adjusting the number of turns N of the back electromotive current generating coil 26 and the breakdown voltage value of the effective induced voltage regulating diode 28 to a speed at which the movable member 6 acts as a braking force, the movable member 6 is driven at a low speed. No braking force is generated in the state where the vehicle is moving, and the braking force can be applied only when the speed exceeds a predetermined speed.

As described above, according to the present embodiment, the induced voltage v of the back electromotive current generating coil 26 is defined in advance in accordance with the speed at which the braking force is applied to the movable member 6, and the induced voltage v Is the breakdown voltage of the constant voltage diode connected between the ends of the back electromotive current generating coil 26, and when the moving speed of the movable member 6 exceeds a specified value, the constant voltage diode is broken down to An electric current can be applied to the movable member 26 to apply a braking force to the movable member 6.

(Tenth Embodiment) FIG. 11 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a tenth embodiment of the present invention. In the present embodiment, as in the fourth embodiment, the excitation driving force is optimized at the time of closing excitation and at the time of shutoff excitation, respectively. Specifically, two electromagnets 9 connected in parallel to each other are used. It is provided as electromagnets 9a and 9b, and one of the electromagnets 9b has a configuration in which a closing excitation contact 21c is connected in series.

That is, in the excitation of the cutoff operation, only one of the electromagnets 9a connected in parallel is energized, and in the excitation of the closing operation, the two electromagnets 9a and 9b connected in parallel are energized.

Next, the operation of the circuit breaker operating device configured as described above will be described. First, in the closing operation,
By closing the closing excitation contacts 21a, 21b, 21c and opening the closing excitation contacts 22a, 22b, the circuit shown by the solid line s in FIG. 11 is established, and the excitation current from the electromagnet excitation power supply 24 is turned on. After passing through the excitation contact 21a, the electromagnets 9a,
9b flow in the AB direction in the forward direction, and are excited.

Next, in the breaking operation, the breaking excitation contacts 22a and 22b are closed, and the closing excitation contacts 21a and 2b are closed.
By closing poles 1b and 21c, a circuit indicated by a broken line d in FIG. 11 is established, and the excitation current from the electromagnet excitation power supply 24 becomes
Only the electromagnet 9a flows through the cut-off excitation contact 22b in the direction opposite to the BA direction to be excited.

Here, if the number of turns N and the resistance value R of the coils of the two electromagnets 9a and 9b are equal and the voltage E of the electromagnet excitation power supply 24 is the same when connected in series or in parallel, 1 With respect to the exciting current I when the plurality of electromagnets 9 are connected, the exciting current of one electromagnet 9 in series connection is I / 2, and in the parallel connection, the exciting current is equal to I and the electromagnetic current generated from the electromagnet coil 9. Since the force F is expressed by the following equation (6), stronger electromagnetic force can be obtained in parallel connection than in series connection.

F∝ (NI) ² (6) That is, at the time of excitation, the movable member 6 is driven by using a strong electromagnetic force in parallel connection, and at the time of cut-off excitation, a weak electromagnetic force (+ spring 10, The movable member 6 can be driven by using the repulsive force of the movable member 6.

As described above, according to the present embodiment, for the energizing operation requiring large energy, the energizing is performed by two times.
By connecting the two electromagnets 9a and 2b in parallel, a large electromagnetic energy can be obtained.
Excitation only can suppress the excitation current.

This embodiment is effective particularly when a large input energy is required, and the two electromagnet coils 9a, 9a,
By connecting 9b in parallel, the electromagnetic force represented by ampere-turns generated from the electromagnet can be increased in the case of the same operating voltage E as compared with the case of serial connection.

(Eleventh Embodiment) FIG. 12 is a schematic diagram showing a control circuit of a circuit breaker operating device according to an eleventh embodiment of the present invention. This embodiment is a modification of the tenth embodiment. Instead of the closing excitation contact 21c, a connection is made between the connection point Pa and the point A of the electromagnet 9b so that the exciting current flowing at the time of closing is in the forward direction. And a cutoff-side excitation limiting diode 21d.

Next, the operation of the circuit breaker operating device configured as described above will be described. Make-up excitation contacts 21a, 21b
Is closed, and the cut-off excitation contacts 22a and 22b are opened, whereby a circuit indicated by a solid line s in FIG. 12 is established. First, the excitation current from the electromagnet excitation power supply 24 passes through the closing excitation contact 21a, and excites the electromagnet 9a in the AB direction in the forward direction.

Further, the exciting current from the electromagnet excitation power supply 24 passes through the cutoff-side excitation limiting diode 21d and the electromagnet 9
b is excited in the AB direction in the forward direction. Thus, during the closing operation, the two electromagnets 9a and 9b are connected in parallel and excited.

Next, by closing the closing excitation contacts 22a and 22b and opening the closing excitation contacts 21a and 21b, the circuit shown by the broken line d in FIG. 12 is established.

First, the excitation current from the electromagnet excitation power supply 24 passes through the cut-off excitation contact 22b to excite the electromagnet 9a in the direction opposite to the BA direction.

However, the electromagnet 9b is not excited because the exciting current is blocked by the blocking-side excitation limiting diode 21d. That is, during the cutoff operation, only one electromagnet 9a is excited.

As described above, according to the present embodiment, the first
In addition to the effect of the embodiment of FIG. 1, the electromagnet 9b connected to the cutoff-side excitation limiting diode 21d is not excited at the time of cutoff, so that the connection switching between the electromagnets 9a and 9b does not require a disconnection mechanism using a mechanical contact or a switching semiconductor. In addition, a control device for controlling these disconnection functions becomes unnecessary. Therefore, the connection switching of the electromagnet in the excitation direction can be realized at a relatively low cost by a connection switching function having a high speed and a simple configuration.

In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0128]

As described above, according to the present invention, it is possible to provide a circuit breaker operating device capable of appropriately controlling the moving speed of the movable member during the closing operation and the closing operation.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a fifth embodiment of the present invention.

FIG. 6 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a sixth embodiment of the present invention.

FIG. 7 is a schematic diagram showing a magnetic circuit of a circuit breaker operating device according to a seventh embodiment of the present invention and its peripheral configuration.

FIG. 8 is a schematic diagram showing a magnetic circuit of a circuit breaker operating device according to an eighth embodiment of the present invention and a peripheral configuration thereof.

FIG. 9 is a schematic diagram showing a magnetic circuit and a peripheral configuration of a circuit breaker operating device according to a ninth embodiment of the present invention.

FIG. 10 is a schematic diagram showing a magnetic circuit and a peripheral configuration of a circuit breaker operating device according to a tenth embodiment of the present invention.

FIG. 11 is a schematic diagram showing a control circuit of a circuit breaker operating device according to an eleventh embodiment of the present invention.

FIG. 12 is a schematic diagram showing a control circuit of a circuit breaker operating device according to a twelfth embodiment of the present invention.

FIG. 13 is a schematic view showing a typical configuration of a general electromagnetic actuator.

FIG. 14 is a schematic diagram showing a relationship between an electromagnetic force acting on a movable member of a general electromagnetic actuator and a spring force.

FIG. 15 is a circuit diagram for explaining an energizing operation when switching the state of the electromagnetic actuator of FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnetic actuator 2 ... Support frame 3a ... Fixed contact 3b ... Movable contact 3 ... Vacuum valve 4 ... Operating rod 5 ... Fixed member 6 ... Movable member 7 ... Permanent magnet 8 ... Magnetic circuit 9, 9a, 9b ... Electromagnet 9t ... Intermediate tap 10,11 ... Spring 12a-12c ... Curve 13 ... Bent line 21a-21c ... Make excitation contact 21d-21e, 22d-22e, 28 ... Diode 22a-22c ... Disconnection excitation contact 23 ... Reactor 24 ... Electromagnetic excitation power supply 25 ... magnetic flux 26 ... counter electromotive current generating coil 27 ... induced current Pa, Pb, Pc ... connection point

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiharu Yamazaki 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant Co., Ltd. (72) Inventor Meihei 1 Toshiba-cho, Fuchu-shi Tokyo F term (reference) 5G028 AA01 DB05 DB09 FD02

Claims (12)

[Claims] 1. An operating device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact that are provided so as to be able to contact and separate from each other, wherein the operating device is fixed to the movable contact. An insulative operating rod held movably in the direction of moving toward and away from the fixed contact; a movable member made of a magnetic material fixed to the operating rod; an electromagnet attached to the movable member; A fixed member that movably holds the operation rod while accommodating an electromagnet and a movable member therein; and
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. An elastic member for energizing the electromagnet; a power supply circuit for exciting the electromagnet; and And a reactor electrically connected in series to the operating device for a circuit breaker. 2. The operating device for a circuit breaker according to claim 1, wherein the reactor is provided between a closing excitation contact for exciting the electromagnet so as to move the movable member in the closing direction, and the electromagnet. An operating device for a circuit breaker, wherein the operating device is arranged in a device. 3. The operating device for a circuit breaker according to claim 1, wherein the reactor is provided between a breaking excitation contact for exciting the electromagnet so as to move the movable member in the breaking direction, and the electromagnet. An operating device for a circuit breaker, wherein the operating device is arranged in a device. 4. An operating device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact that are provided so as to be able to contact and separate from each other, wherein the movable contact is fixed to the movable contact. An insulating operating rod held movably in a direction to contact and separate from the fixed contact, a movable member made of a magnetic material fixed to the operating rod, and an intermediate tap attached to the movable member, An electromagnet having a fixed member that movably holds the operation rod while accommodating the electromagnet and the movable member therein, and that is disposed inside the fixed member so as to face the movable member,
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. An elastic member for energizing the electromagnet; a power supply circuit for exciting the electromagnet; electrically connected to both ends of the electromagnet, and the electromagnet in all sections so as to move the movable member in the closing direction. A plurality of closing excitation contacts for exciting over the one end of the electromagnet, and one end of the electromagnet from the intermediate tap so as to move the movable member in the blocking direction, the one end being electrically connected to the one end of the electromagnet and the intermediate tap. And a plurality of shut-off excitation contacts for exciting over a section up to and including: 5. An operation device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact that are provided so as to be able to contact and separate from each other, the device being fixed to the movable contact, An insulating operating rod held movably in a direction to contact and separate from the fixed contact, a movable member made of a magnetic material fixed to the operating rod, and an intermediate tap attached to the movable member, An electromagnet having a fixed member that movably holds the operation rod while accommodating the electromagnet and the movable member therein, and that is disposed inside the fixed member so as to face the movable member,
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. A power supply circuit for exciting the electromagnet; an exciting diode having an anode connected to one end of the electromagnet; a cathode connected to an intermediate tap of the electromagnet; An operating device for a circuit breaker, comprising: a breaking diode in which a cathode is electrically connected to a cathode of the diode. 6. The operating device for a circuit breaker according to claim 5, wherein a plurality of excitation contacts electrically connected to the other end of the electromagnet, a cathode of the excitation diode and an anode of the interruption diode, respectively. And a contact control circuit for controlling each of the excitation contacts to be opened while the movable member is moving. 7. An operating device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact provided so as to be able to contact and separate from each other, wherein the operating device is fixed to the movable contact, and the movable contact is An insulating operating rod held movably in a direction to contact and separate from the fixed contact, a movable member made of a magnetic material fixed to the operating rod, and an intermediate tap attached to the movable member, An electromagnet having a fixed member that movably holds the operation rod while accommodating the electromagnet and the movable member therein, and that is disposed inside the fixed member so as to face the movable member,
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. An elastic member for energizing the electromagnet; a power supply circuit for exciting the electromagnet; and the reverse member installed at a position interlinking with a magnetic flux of a magnetic circuit including the fixed member, the permanent magnet, the movable member, and the electromagnet. An operating device for a circuit breaker, comprising an electromotive current generating coil. 8. The circuit breaker operating device according to claim 7, wherein a forward direction of an induced current induced when the movable member moves in a closing direction is provided between ends of the back electromotive current generating coil. An operation device for a circuit breaker, comprising a connected induced current interruption diode. 9. The operating device for a circuit breaker according to claim 7, wherein a forward direction is generated between an end of the back electromotive current generating coil and an induced current induced when the movable member moves in a blocking direction. An operation device for a circuit breaker, comprising a connected induced current interruption diode. 10. The operating device for a circuit breaker according to claim 7, further comprising: a plurality of constant voltage diodes connected in series and with opposite polarities between terminals of the back electromotive current generating coil. Operating device for circuit breakers. 11. An operating device for a circuit breaker for operating a circuit breaker having a movable contact and a fixed contact that are provided so as to be able to contact and separate from each other, wherein the movable contact is fixed to the movable contact. An insulating operating rod movably held in the direction of moving toward and away from the fixed contact, a movable member made of a magnetic material fixed to the operating rod, and attached to the movable member and connected in parallel with each other A plurality of electromagnets, a fixed member that movably holds the operation rod while accommodating each of these electromagnets and the movable member, and that is disposed inside the fixed member so as to face the movable member,
A permanent magnet that attracts the movable member in a closing direction in which the movable contact is brought into contact with the fixed contact, and an operating rod in a blocking direction in which the movable contact is separated from the fixed contact. An elastic member for urging the electromagnet; a power supply circuit for exciting each of the electromagnets; and a pole closed when one of the electromagnets is connected to one end of the electromagnet to move the movable member in the closing direction. And a closing excitation contact that is controlled to be open when moving in the breaking direction. 12. The operating device for a circuit breaker according to claim 11, wherein, instead of the closing excitation contact, an exciting current flows in a direction for moving the movable member in the closing direction. An operating device for a circuit breaker, comprising a closing diode connected to one end of one electromagnet in a forward direction.