Switchgear operating mechanism and switchgear

Abstract

To provide an opening / closing device operation mechanism capable of stably holding an initial position of a plunger of a solenoid and stabilizing an operation characteristic, and provide an opening / closing device.SOLUTION: An opening / closing device operation mechanism that performs a start of a reciprocation that is relatively moved between a block state and an input state of a breaker by an excitation of an electromagnetic solenoid, comprises: an adsorptive electromagnetic coil of the electromagnetic solenoid; a stator that is magnetized and controlled by a magnetization current flowing in the adsorptive electromagnetic coil; a movable element that is distributed so as to be moved onto the same shaft in response to a magnetic attraction force of the stator that is magnetized and controlled; a plunger that is integrally inserted into the movable element; a return spring that returns the movable elements to an initial position when the adsorptive electromagnetic coil is in a non-magnetization state; and a holding mechanism that holds the movable element to the initial position by the magnetic force at the time when the adsorptive electromagnetic coil is in a non-magnetization state.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a switchgear operating mechanism and a switchgear. [Background technology]

[0002] Generally, switchgear (circuit breakers) are a type of power transmission and transformation equipment that controls the switching of large amounts of power to protect power systems from lightning damage and ensure stable operation of the system. Switchgear requires highly responsive and fast moving contact operation to minimize the effects of arc discharge when opening (breaking) and closing (closing). Spring operating mechanisms that use spring operating force and hydraulic operating mechanisms that use hydraulic pressure are widely used as operating mechanisms for driving the moving contacts.

[0003] In order to maintain the stability of the power system, it is extremely important to maintain stable operating characteristics of the operating mechanism. In particular, floating offshore substations are subject to continuous vibrations, and in bad weather in particular, large shaking can occur, so stable operation is required even in places with such large vibrations.

[0004] A conventional example of such a switching device operating mechanism is the technology described in Patent Document 1, for example. In this spring operating mechanism, the force of the breaking spring is maintained via an output lever by a retention mechanism consisting of a latch, tripping link mechanism, etc. The breaking operation of a spring operating mechanism configured in this way is performed when a trip current flows through the solenoid, causing the solenoid plunger to operate the tripping link, disengaging the output lever from the latch, causing the output lever to rotate and releasing the breaking spring force. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3497866 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned conventional example, when the breaking operation starts, a trip current is passed through the solenoid to operate the plunger. However, depending on the initial position of the plunger, the operating characteristics, such as the load and speed, when the plunger hits the trip link vary. Therefore, if the initial position of the plunger is not stable, the breaking performance may deteriorate due to an increased contact opening time, or the breaking spring may not be released, preventing the breaking operation.

[0007] Generally, plungers are held in a predetermined initial position by a return spring or other device, but in places where excessive vibration occurs, such as floating offshore substations, the plunger may be subjected to inertial forces greater than the load of the return spring, making it impossible to maintain the initial position.

[0008] Another method is to strengthen the return spring to hold the plunger in its initial position, but if the return spring is strengthened, it will be necessary to increase the coil current or make the solenoid larger in order to achieve sufficient driving force and speed.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide a switchgear operating mechanism and a switchgear that can stably maintain the initial position of a solenoid plunger and stabilize operating characteristics even in places where excessive vibration occurs, such as floating offshore substations. [Means for solving the problem]

[0010] In order to achieve the above object, a switchgear operation mechanism according to an embodiment is a switchgear operation mechanism that starts a reciprocating drive that transitions between an open state and an open state of a circuit breaker by exciting an electromagnetic solenoid, and includes an attracting electromagnetic coil of the electromagnetic solenoid, a stator whose magnetization is controlled by an exciting current flowing through the attracting electromagnetic coil, a mover that is disposed so as to be movable coaxially with the stator due to the magnetic attractive force of the magnetization-controlled stator, a plunger that penetrates the mover and is integrated with it, a return spring that returns the mover to an initial position when the attracting electromagnetic coil is in a non-excited state, and a holding mechanism that holds the mover in the initial position by magnetic force when the attracting electromagnetic coil is in a non-excited state. The holding mechanism includes a holding portion made of a magnetic material and arranged on the opposite side of the plunger from the driving direction, a permanent magnet that holds the holding portion by magnetic force at the initial position, and an electromagnetic coil for the permanent magnet that generates a magnetic field that cancels the magnetic force of the permanent magnet by an excitation current. It is characterized by the fact that

[0011] In order to achieve the above object, a switchgear according to an embodiment is a switchgear comprising a circuit breaker and a switchgear operation mechanism that starts reciprocating drive of the circuit breaker to switch between a break state and a close state by exciting an electromagnetic solenoid, wherein the switchgear operation mechanism comprises: an attraction electromagnetic coil of the electromagnetic solenoid; a stator whose magnetization is controlled by an excitation current flowing through the attraction electromagnetic coil; a mover that is disposed so as to be movable coaxially with the stator due to the magnetic attractive force of the magnetization-controlled stator; a plunger that penetrates the mover and is integral with it; a return spring that returns the mover to an initial position when the attraction electromagnetic coil is in a non-excited state; and a holding mechanism that holds the mover in the initial position by magnetic force when the attraction electromagnetic coil is in a non-excited state. The holding mechanism includes a holding portion made of a magnetic material and arranged on the opposite side of the plunger from the driving direction, a permanent magnet that holds the holding portion by magnetic force at the initial position, and an electromagnetic coil for the permanent magnet that generates a magnetic field that cancels the magnetic force of the permanent magnet by an excitation current. It is characterized by the fact that [Effects of the Invention]

[0012] According to the embodiments of the present invention, it is possible to provide a switchgear operating mechanism and a switchgear that can stably maintain the initial position of the solenoid plunger and stabilize the operating characteristics even in places where excessive vibration occurs, such as floating offshore substations. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a schematic configuration of an opening / closing device according to an embodiment; [Figure 2] FIG. 2 is a diagram schematically showing a cross-sectional configuration of the electromagnetic solenoid according to the first embodiment in a standby state. [Figure 3] FIG. 2 is a diagram schematically showing a cross-sectional configuration of the electromagnetic solenoid according to the first embodiment in an excited state. [Figure 4] 2 is a diagram schematically illustrating the configuration of the switchgear operation mechanism shown in FIG. 1 in an on state. FIG. [Figure 5] 2 is a diagram schematically illustrating the configuration of the switchgear operation mechanism shown in FIG. 1 in an interrupted state. FIG. [Figure 6] 2 is a diagram schematically illustrating a configuration of the switchgear operation mechanism shown in FIG. 1 immediately after completing a closing operation. FIG. [Figure 7] FIG. 10 is a diagram schematically showing a cross-sectional configuration of a holding mechanism case of a holding mechanism according to a second embodiment. [Figure 8] FIG. 10 is a diagram schematically illustrating a cross-sectional configuration of an electromagnetic solenoid according to a third embodiment in a standby state. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an opening / closing device operating mechanism and an opening / closing device according to an embodiment will be described with reference to the drawings.

[0015] 1 is a diagram showing a schematic overall configuration of a switchgear according to an embodiment. As shown in FIG. 1, the switchgear includes a circuit breaker 1 and a switchgear operating mechanism (spring operating mechanism) 2.

[0016] The circuit breaker 1 has a fixed contact 21 and a movable contact 22 disposed in the tank 10. The circuit breaker 1 is in a closed (closed) state when the movable contact 22 comes into contact with the fixed contact 21, and in a broken (open) state when the movable contact 22 separates from the fixed contact 21.

[0017] The movable contact 22 is connected to the output rod 20 and is connected to the main lever 31 via a link mechanism 23 .

[0018] The breaking electromagnetic solenoid 41 and the closing electromagnetic solenoid 42 are disposed on the frame 24 of the switchgear operation mechanism 2. A plunger 41a of the breaking electromagnetic solenoid 41 is detachably engaged with the breaking lock lever 81. Also, a plunger 42a of the closing electromagnetic solenoid 42 is detachably engaged with the closing lock lever 82.

[0019] FIG. 2 is a diagram showing a cross-sectional configuration of the cutoff electromagnetic solenoid 41 and the make electromagnetic solenoid 42 shown in FIG. 1 in a standby state.

[0020] The breaking electromagnetic solenoid 41 and the closing electromagnetic solenoid 42 each include an attracting electromagnetic coil 43, a stator 44 whose magnetization is controlled by an excitation current flowing through the attracting electromagnetic coil 43, a mover 45 arranged so that it can move in the direction of arrow A on its coaxial surface in response to the magnetic attraction of the magnetization-controlled stator 44, plungers 41a, 42a formed integrally with and penetrating the mover 45, a return spring 46 that returns the mover 45 to its initial position in a non-excited state, and a holding mechanism 50 that holds the mover 45 in its initial position.

[0021] The holding mechanism 50 includes a holding portion 51 made of a magnetic material and arranged at the end opposite to the driving direction (arrow A) of the plungers 41a, 42a, a permanent magnet 52 that holds the holding portion 51 in place at its initial position by magnetic force, an electromagnetic coil 53 for the permanent magnet that generates a magnetic field that cancels out the magnetic force of the permanent magnet 52 by an excitation current, a holding mechanism stator 54 made of a magnetic material that serves as a path for magnetic flux to generate the magnetic field, and a fixing portion 55 made of a non-magnetic material that is arranged between the holding mechanism stator 54 and the stator 44 and fixes the holding mechanism stator 54 to the stator 44.

[0022] Fig. 4 is a diagram showing the closed state of the opening / closing device operation mechanism 2. As shown in Fig. 4, one end of the opening spring 32 is fixed to the mounting surface 30 of the frame 34, and the other end is fitted into the opening spring holder 36. A damper 37 is fixed to the opening spring holder 36, and a fluid is sealed inside the damper 37, with a piston 37a disposed therein so as to be able to slide in translation. One end of the damper 37 is fixed to the opening spring link 35, and is rotatably attached to the pin 31a of the main lever 31.

[0023] A sub-shaft 90 is rotatably disposed on the frame 34, and a sub-lever 91 is fixed to the sub-shaft 90. A pin 91a is disposed on one end of the sub-lever 91, and pin 31d and pin 91a are connected by a main / sub-connecting link 100. A latch lever 92 is fixed to the sub-shaft 90, and a roller 92a is rotatably fitted to one end of the latch lever 92. Furthermore, a cam lever 93 is fixed to the sub-shaft 90, and a roller 93a is rotatably fitted to one end of the latch lever 92.

[0024] One end of the closing spring 33 is fixed to the mounting surface 30 of the frame 34, and the other end is fitted into a closing spring holder 38. A pin 38a is arranged in the closing spring holder 38, and this pin 38a is connected via a closing link 103 to a pin 102a of a closing lever 102 fixed to the end of a closing shaft 101 that is rotatably arranged on the frame 34. A closing cam 104 is fixed to the closing shaft 101, and is releasably engaged with the roller 93a as the closing shaft 101 rotates.

[0025] A pawl 102b is disposed at one end of the closing lever 102, and is releasably engaged with a crescent portion 82a provided on the closing lock lever 82. A return spring 82b is also disposed at one end of the closing lock lever 82, and the other end of the return spring 82b is fixed to the frame 34. The return spring 82b is a compression spring, and a spring force that constantly rotates the closing lock lever 82 clockwise is applied to the closing lever 102. However, this rotation is restricted by the plunger 42a. In the state shown in FIG. 4, the pin 38a is located to the right of the pin 102a, and therefore the closing lever 102 is constantly subjected to a torque from the closing spring 33 that rotates it counterclockwise. However, this rotation is stopped by the engagement between the pawl 102b and the crescent portion 82a.

[0026] A locking lever 110 is rotatably disposed on the closing shaft 101. A latch 111 is rotatably disposed at the end of the locking lever 110, and a return spring 111a is disposed between the locking lever 110 and the latch 111. This return spring 111a is a compression spring, and a spring force that rotates the latch 111 clockwise is always acting on the locking lever 110. This rotation is restricted by a stopper 110a disposed on the locking lever 110.

[0027] A claw 110b is disposed on one end of the locking lever 110, and is detachably engaged with a crescent portion 81a provided on the breaking locking lever 81. Furthermore, a return spring 110c is disposed on the locking lever 110, the other end of which is fixed to the frame 34. This return spring 110c is a compression spring, and a spring force that constantly acts to rotate the locking lever 110 clockwise is applied. This rotation is restricted by a stopper 34a fixed to the frame 34. A return spring 81b is disposed between the breaking locking lever 81 and the frame 34, and the return spring 81b, which is a compression spring, constantly generates a spring force that constantly rotates the breaking locking lever 81 clockwise. However, this rotation is restricted by the plunger 41a.

[0028] The main lever 31 is rotatably disposed on the closing shaft 101, and is constantly subjected to a clockwise torque by the spring force of the breaking spring 32. The force transmitted to the main lever 31 is transmitted to the sub-lever 91 via the main / sub connecting link 100. This force becomes a torque that constantly rotates the sub-lever 91 counterclockwise, and at the same time, it also tries to rotate the latch lever 92 counterclockwise. However, in the closed state, the tip of the latch 111 is engaged with the roller 92a, so the rotation of the latch lever 92 is restricted, and the subsequent members from the sub-lever 91 to the breaking spring 32 are held stationary.

[0029] In the breaking electromagnetic solenoid 41 and the closing electromagnetic solenoid 42, as shown in FIG. 3, the permanent magnet 52 generates a magnetic flux in the direction of the arrow P, attracts the holding portion 51, and holds the mover 45 in the initial position.

[0030] In the present embodiment configured as described above, the interruption operation will be described first. In the closed state shown in Fig. 4, the permanent magnet electromagnetic coil 53 and the attraction electromagnetic coil 43 of the interrupter electromagnetic solenoid 41 are excited by an external command, generating magnetic fluxes in the directions of arrows R and S, respectively, as shown in Fig. 3.

[0031] The magnetic flux of arrow R generated by the excitation of electromagnetic coil 53 for permanent magnet is generated in a direction that cancels out the magnetic flux of arrow P generated by permanent magnet 52, thereby canceling out the magnetic force of permanent magnet 52 and eliminating the attraction force of holding part 51. Furthermore, the magnetic flux of arrow S generated by the excitation of electromagnetic coil 43 for attraction attracts mover 45 to stator 44, so that plunger 41a moves in the direction of arrow A shown in FIG. 3 (arrow B shown in FIG. 4).

[0032] The breaking locking lever 81 rotates counterclockwise because it is engaged with the plunger 41a. Subsequently, the half-moon portion 81a and the claw 110b disengage, the locking lever 110 rotates counterclockwise (in the direction of arrow C), and the latch 111 disengages from the roller 92a. After that, the latch lever 92, the cam lever 93 fixed to the sub-shaft 90, and the sub-lever 91 rotate counterclockwise (in the direction of arrows D and E). Then, the main lever 31 rotates clockwise (in the direction of arrow F), and the breaking spring 32 and damper 37 operate in the direction of arrow G. The link mechanism 23 and the output rod 20 connected to it move rightward, and the breaking operation begins.

[0033] When the breaking spring 32 is displaced a certain distance, the piston 37a engages with the stopper 34a fixed to the frame 34, the braking force of the damper 37 is generated, stopping the operation of the breaking spring 32, and the operation of the linked levers connected to it also stops, completing the breaking operation. This state is shown in Figure 5. Furthermore, when the excitation of the permanent magnet electromagnetic coil 53 and the attraction electromagnetic coil 43 ends, the mover 45 is moved to its initial position by the return spring 46. Furthermore, the permanent magnet 52 attracts the holding portion 51, thereby maintaining the mover 45 in its initial position.

[0034] Next, the closing operation will be described with reference to Figures 2, 5, and 6. Figure 5 shows the state in which the closing spring 33 is energized in the disconnected state. Figure 6 shows the state in which the closing operation is completed.

[0035] In response to an external command, the permanent magnet electromagnetic coil 53 and the attracting electromagnetic coil 43 of the closing electromagnetic solenoid 42 are excited, and magnetic flux is generated in the directions of arrow R and arrow S, respectively, as shown in Fig. 3. The magnetic flux of arrow R generated by the permanent magnet electromagnetic coil is generated in a direction that cancels out the magnetic flux of arrow P generated by the permanent magnet 52, so the magnetic force of the permanent magnet 52 is canceled out and the attracting force of the holding part 51 is eliminated. In addition, the magnetic flux of arrow S generated by the attracting electromagnetic coil 43 attracts the mover 45 to the stator 44, and the plunger 42a moves in the direction of arrow A shown in Fig. 3 (arrow H shown in Fig. 5).

[0036] 5, the closing locking lever 82 rotates counterclockwise because it is engaged with the plunger 42a. This disengages the half-moon portion 82a from the pawl 102b, and the closing lever 102 and closing shaft 101 rotate counterclockwise (in the direction of arrow I) due to the spring force of the closing spring 33, which is released in the direction of arrow J. The closing cam 104, which is fixed to the closing shaft 101, rotates in the direction of arrow K and engages with the roller 93a. When the roller 93a is pushed in by the closing cam 104, the cam lever 93 rotates clockwise (in the direction of arrow L), and at the same time, the sub-lever 91 rotates in the direction of arrow M.

[0037] The rotation of the sub-lever 91 is transmitted to the main lever 31, which rotates counterclockwise (in the direction of arrow N), causing the link mechanism 23 and the output rod 20 connected thereto to move leftward, performing the closing operation. As the main lever 31 rotates, the link 35 moves in the direction of arrow R, the breaking spring 32 is energized, and the roller 92a re-engages with the latch 111, completing the closing operation. Figure 6 shows the state after the closing operation is completed. After this, the closing spring 33 is energized by the drive of a motor or the like, and the state shown in Figure 4 is reached.

[0038] Furthermore, when the excitation of the electromagnetic coil for permanent magnet 53 and the magnetic attraction electromagnetic coil 43 is completed, the mover 45 is moved to its initial position by the return spring 46. Furthermore, the permanent magnet 52 attracts the holding portion 51, thereby holding the mover 45 in its initial position.

[0039] As described above, according to this embodiment, before operation, the plungers 41a, 42a can be held in their initial positions by the magnetic force of the permanent magnet 52 of the holding mechanism 50, so that the initial positions of the plungers 41a, 42a do not move even if excessive vibration occurs in the opening and closing device. Furthermore, during operation, the magnetic force of the permanent magnet 52 can be eliminated by exciting the electromagnetic coil 53 for the permanent magnet, so that the attractive force due to the excitation of the attraction electromagnetic coil 43 is not impeded, and sufficient driving force and speed can be achieved when the breaking lock lever 81 or the closing lock lever 82 collides.

[0040] Furthermore, by providing a gap between the holding portion 51 and the permanent magnet 52 in the standby state before operation, the holding portion 51 does not collide with the permanent magnet 52 when the mover 45 is returned to its initial position by the return spring 46 after excitation. This prevents damage to the permanent magnet 52 and therefore does not reduce the holding force.

[0041] [Second embodiment] Fig. 7 shows a schematic cross-sectional view of a holding mechanism case 56 of a holding mechanism 50 according to a second embodiment. In Fig. 7, parts that are the same as or similar to those in the first embodiment shown in Figs. 2 and 3 are designated by the same reference numerals, and redundant explanations will be omitted.

[0042] In this embodiment, of the holding mechanism 50 shown in FIG. 2, as shown in FIG. 7, a holding mechanism case 56 having an integral structure in which a permanent magnet 52, an electromagnetic coil 53 for the permanent magnet, a stator 54 for the holding mechanism, and a fixing portion 55 are arranged is detachable from the stator 44.

[0043] In this embodiment configured as described above, in an opening / closing device installed in a location where severe vibrations do not occur, an electromagnetic solenoid without a holding mechanism 50 can be provided by removing the holding mechanism case 56 and detaching the holding part 51 from the plungers 41a and 42a.

[0044] [Third embodiment] Fig. 8 shows a schematic cross-sectional view of the electromagnetic solenoid of the third embodiment. In Fig. 8, parts that are the same as or similar to those of the first embodiment shown in Figs. 2 and 3 are designated by the same reference numerals, and redundant explanations will be omitted.

[0045] 2, a protrusion 57 is formed on the plungers 41a, 42a, which penetrates the holding portion 51 and protrudes in the opposite direction to the driving direction A, and extends to the outside of the holding mechanism 50. Furthermore, the permanent magnet 52a has a through-hole through which the protrusion 57 can penetrate, and the holding mechanism stator 54a has a guide hole through which the protrusion 57 of the plungers 41a, 42a can slide.

[0046] In this embodiment configured as described above, the cut-off lock lever 81 or the turn-on lock lever 82 can be rotated by a simple manual operation of pressing the protrusion 57 of the plungers 41a, 42a, and there is no need to provide a new manual operation unit, thereby saving space.

[0047] (Other embodiments) Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as the inventions described in the claims and their equivalents.

[0048] For example, although an example of a spring operating mechanism has been shown as the embodiment above, the present invention can also be applied to a spring operating mechanism and a hydraulic operating mechanism having a different configuration from those of the above embodiments. Furthermore, for example, in the standby state, the permanent magnet 52 is magnetized by exciting the electromagnetic coil 53 for the permanent magnet so as to generate a magnetic flux in the opposite direction to the arrow R, thereby restoring the attractive force of the permanent magnet 52. This makes it possible to maintain a stable holding force of the permanent magnet 52. Furthermore, for example, by configuring the holding mechanism 50 so that the holding part 51 can be driven in the opposite direction to the driving direction by exciting the electromagnetic coil 53 for the permanent magnet after the operation of the opening and closing device is completed, it is possible to omit the return spring. [Explanation of symbols]

[0049] 1... Circuit breaker, 2... Switchgear operating mechanism (spring operating mechanism), 10... Tank, 20... Output rod, 21... Fixed contact, 22... Movable contact, 23... Link mechanism, 24... Frame, 30... Mounting surface, 31... Main lever, 31a... Pin, 31d... Pin, 32... Breaking spring, 33... Closing spring, 34... Frame, 34a... Stopper, 35... Breaking spring link, 36... Breaking spring holder, 37... Damper, 37a... Piston, 38... Closing spring holder, 38a... Pin, 41... Breaking electromagnetic solenoid, 41a... Plunger, 42... Closing electromagnetic solenoid, 42a... Plunger, 43... Adsorption electromagnetic coil, 44... Stator, 45... Movable contact, 46... Return spring, 50... Holding mechanism, 51... Holding portion, 52, 52a... Permanent magnet Stone, 53...electromagnetic coil for permanent magnet, 54, 54a...stator for holding mechanism, 55...fixed portion, 56...holding mechanism case, 57...protrusion, 81...breaking locking lever, 81a...half-moon portion, 81b...return spring, 82...closing locking lever, 82a...half-moon portion, 82b...return spring, 90...sub-shaft, 91...sub-lever, 91a...pin, 92...latch lever, 92a...roller, 93...cam lever, 93a...roller, 100...main / sub-connecting link, 101...closing shaft, 102...closing lever, 102a...pin, 102b...claw, 103...closing link, 104...closing cam, 110...locking lever, 110a...stopper, 110b...claw, 110c...return spring, 111...latch, 111a...return spring.

Claims

1. A switching device operation mechanism that starts reciprocating drive of a circuit breaker between an open state and an open state by exciting an electromagnetic solenoid, an attracting electromagnetic coil of the electromagnetic solenoid; a stator whose magnetization is controlled by an exciting current flowing through the attraction electromagnetic coil; a mover disposed so as to be movable coaxially with the stator under magnetic attraction of the stator, the stator being magnetized; a plunger that penetrates the movable element and is integral with the movable element; a return spring that returns the movable element to its initial position when the attraction electromagnetic coil is in a non-excited state; a holding mechanism that holds the movable element at the initial position by magnetic force when the attracting electromagnetic coil is in a non-excited state; Equipped with The retention mechanism is a holding portion made of a magnetic material and disposed on the opposite side of the plunger from the driving direction; a permanent magnet that holds the holding portion by magnetic force at the initial position; an electromagnetic coil for a permanent magnet that generates a magnetic field that cancels the magnetic force of the permanent magnet by an excitation current; A switching device operating mechanism comprising:

2. The retention mechanism is a stator for a magnetic body holding mechanism that serves as a path for magnetic flux from the electromagnetic coil for the permanent magnet; a non-magnetic fixed portion disposed between the holding mechanism stator and the stator; 2. The opening and closing device operating mechanism according to claim 1, further comprising:

3. In the initial position, a gap is formed between the holding portion and the permanent magnet.

3. The opening / closing device operating mechanism according to claim 1 or 2.

4. a holding mechanism case in which the permanent magnet, the permanent magnet electromagnetic coil, the holding mechanism stator, and the fixed portion are integrally formed is detachable from the stator; The opening / closing device operating mechanism according to claim 2 .

5. the plunger has a protruding portion that penetrates the holding portion and protrudes in a direction opposite to the driving direction, the permanent magnet has a through hole through which the protrusion can pass, The holding mechanism stator has a guide hole in which the protrusion can slide. The opening / closing device operating mechanism according to claim 2 .

6. The holding mechanism is capable of magnetizing the permanent magnet by exciting the electromagnetic coil for the permanent magnet.

3. The opening / closing device operating mechanism according to claim 1 or 2.

7. a holding mechanism case in which the permanent magnet, the permanent magnet electromagnetic coil, the holding mechanism stator, and the fixed portion are integrally formed is detachable from the stator; The opening / closing device operating mechanism according to claim 2 .

8. the plunger has a protruding portion that penetrates the holding portion and protrudes in a direction opposite to the driving direction, the permanent magnet has a through hole through which the protrusion can pass, The holding mechanism stator has a guide hole in which the protrusion can slide. The opening / closing device operating mechanism according to claim 2 .

9. The holding mechanism is capable of magnetizing the permanent magnet by exciting the electromagnetic coil for the permanent magnet. The opening / closing device operating mechanism according to claim 3 .

10. A circuit breaker, a switchgear operation mechanism that starts a reciprocating drive of the circuit breaker to alternate between an open state and an open state by exciting an electromagnetic solenoid; A switching device comprising: The opening and closing device operating mechanism includes: an attracting electromagnetic coil of the electromagnetic solenoid; a stator whose magnetization is controlled by an exciting current flowing through the attraction electromagnetic coil; a mover disposed so as to be movable coaxially with the stator under magnetic attraction of the stator, the stator being magnetized; a plunger that penetrates the movable element and is integral with the movable element; a return spring that returns the movable element to its initial position when the attraction electromagnetic coil is in a non-excited state; a holding mechanism that holds the movable element at the initial position by magnetic force when the attracting electromagnetic coil is in a non-excited state; Equipped with The retention mechanism is a holding portion made of a magnetic material and arranged on the opposite side of the plunger from the driving direction; a permanent magnet that holds the holding portion by magnetic force at the initial position; an electromagnetic coil for a permanent magnet that generates a magnetic field that cancels the magnetic force of the permanent magnet by an excitation current; An opening and closing device characterized by comprising:

11. The retention mechanism is a stator for a magnetic body holding mechanism that serves as a path for magnetic flux from the electromagnetic coil for the permanent magnet; a non-magnetic fixed portion disposed between the holding mechanism stator and the stator; The opening and closing device according to claim 10, characterized in that it comprises:

12. In the initial position, a gap is formed between the holding portion and the permanent magnet.

12. The opening and closing device according to claim 10 or 11.

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