JPH09198976A - High-speed circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the operating cycle life of an electromagnetic repulsing device by providing a protecting plate between the clamp arid the short circuit plate of the electromagnetic repulsing device provided on a link mechanism. SOLUTION: An electromagnetic repulsing device 81 is arranged with a protecting plate 62 on the lower face of a clamp 43 via compression springs 60, and a short circuit plate 61 is provided between the protecting plate 62 and an electromagnetic coil 49. The coil 49 is fixed to a fixed frame 45 via a fixed section 54. The short circuit plate 61 is made of a copper material having large electric conductivity, and the protecting plate 82 is made of a light material strong against mechanical shocks such as reinforced aluminum, for example. When the device 81 is operated, the protecting plate 62 collides with the clamp 43, the damage of the short circuit plate 61 is prevented, and the operating cycle life of the device 81 can be extended. Since the protecting plate 62 is made lightweight, the electromagnetic repulsion can be strengthened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high speed circuit breaker in which an electromagnetic repulsion device is added to a vacuum valve and the opening time is very short.

[0002]

2. Description of the Related Art In order to extremely shorten the opening time of a vacuum valve, it has been conventionally practiced to apply a repulsive force of an electromagnetic repulsion device to its movable shaft to drive the opening. Figure 7
[Fig. 4] is a principle diagram illustrating an opening mechanism of a conventional high speed circuit breaker. A movable shaft 3A and a fixed shaft 3B are pulled out from a vacuum valve 1 having a built-in opening / closing portion and connected to main circuit terminals 4A and 4B, respectively. The upper end of the movable shaft 3A is
It is connected to the insulating connecting shaft 5, and the insulating connecting shaft 5 is further connected to the operation rod 7 via the conversion lever 6. The side of the operation rod 7 opposite to the conversion lever 6 is also connected to another conversion lever 8. The right end of the conversion lever 8 is
One end of the tension spring 9 is hooked on a pin 8B that engages with the upper end of the lever 10 and penetrates the conversion lever 8 in the middle thereof. The other end of the tension spring 9 is fixed to the fixed end 9A, and always urges the conversion lever 8 to rotate clockwise. That is, the insulating connecting shaft 5 to the conversion lever 8 constitute a link mechanism, and the operating portion 23 having the tension spring 9 drives the vacuum valve 1 to open the electrode via the link mechanism.

Further, in FIG. 7, an electromagnetic repulsion device 70 constituted by penetrating the short-circuit plate 40 and the electromagnetic coil 49 into the insulating connecting shaft 5 is added. On the other hand, a trip rod 11 is arranged so as to face the lower end of the lever 10, and the trip rod 11
A trip coil 20 is provided for driving the to the left. A control power supply 12 for exciting the electromagnetic coil 49 and the trip coil 20 is shown in the upper part of the drawing. The capacitor 16 of the control power supply 12 is charged by the DC power supply 17, and both ends of the capacitor 16 are connected to both ends of the electromagnetic coil 49 via the thyristor 15. Further, both ends of the DC power supply 13 are also connected to both ends of the trip coil 20 via the thyristors 14, respectively.

FIG. 8 is an enlarged cross-sectional view of an essential part showing the structure of the apparatus shown in FIG. The vacuum valve 1 includes an insulating cylinder 1D, and both ends of the insulating cylinder 1D are covered with lids 1A and 1B to form a vacuum container. Moving contact 2A inside this vacuum container
The fixed contactor 2B and the fixed contactor 2B face each other so as to be openable and closable to form an open / close portion. Movable contactor 2A and fixed contactor 2B
Is a movable shaft 3A and a fixed shaft 3B in the vacuum container, respectively.
One end of the movable shaft 3A is joined to the other end, and the other end of the movable shaft 3A is movably drawn to the outside via a bellows 1C. On the other hand, the other end of the fixed shaft 3B is fixed to the lid 1B and is fixedly drawn to the outside. Further, the electromagnetic coil 49 of the electromagnetic repulsion device 70 is supported by the fixed portion 54, and the fastener 43 is connected to the insulating connecting shaft 5 by the pin 50 penetrating the insulating connecting shaft 5.
It is fixed to. The short-circuit plate 40 is interposed between the fastener 43 and the electromagnetic coil 49, and is free to move in the axial direction of the insulating connecting shaft 5. Further, a compression spring 71 is interposed between the short circuit plate 40 and the fastener 43, and the short circuit plate 40 is constantly pressed toward the electromagnetic coil 49 side.

In FIG. 8, the upper end of the insulating connecting shaft 5 is connected to the conversion lever 6 via a pin 5A, and the left end of the conversion lever 6 is connected to the operating rod 7 via a pin 7B. There is. The lower end of the operation rod 7 is connected to an operation unit (not shown). The conversion lever 6 can rotate about the fixed pin 6A as a fulcrum. Operating rod 7
Has a pin 7B penetrating through an elongated hole 7A which is long in the axial direction thereof, and a compressible wipe spring 27 is provided on an upper portion of the operating rod 7.
Is arranged. The lower spring bearing 30 is fixed to the operating rod 7, and the upper spring bearing 28 is supported by the operating rod 7 so as to be freely movable in the axial direction. The wipe spring 27 interposed between the spring bearings 28 and 30 pushes up the conversion lever 6 via the spring bearing 28 and constantly urges the conversion lever 6 to rotate counterclockwise. . As a result, the insulating connecting shaft 5 is pushed down, and the contact pressure between the movable contactor 2A and the fixed contactor 2B when the electrodes are closed is always kept constant. Further, the movable shaft 3A is connected to the main circuit terminal 4A via the flexible conductor 25. This suppresses the movement of the movable shaft 3A during opening and closing from being transmitted to the main circuit terminal 4A.

Returning to FIG. 7, the opening principle of this device will be described below. The gates of the thyristors 14 and 15 are simultaneously injected with the opening signals 21 and 22, respectively, so that
Are fired together. The ignition of the thyristor 14 causes a current to flow from the DC power supply 13, and the trip coil 20 is excited. By this excitation, the trip bar 11 pops out to the left and hits the lower end of the lever 10. As a result, the lever 10 rotates clockwise around the fixing pin 10A, so that the right end of the conversion lever 8 and the upper end of the lever 10 are disengaged. Along with this, the tension spring 9 pulls the conversion lever 8 downward from the pin 8B, so that the conversion lever 8 also rotates clockwise around the fixed pin 8A. Along with that, the operating rod 7 is lowered, so that the conversion lever 6 rotates clockwise around the fixed pin 6A. As a result, the movable shaft 3A is raised, and the vacuum valve 1 is opened.

On the other hand, the electric charge accumulated in the capacitor 16 flows out by the ignition of the thyristor 15, and the electromagnetic coil 49 is excited. Eddy current is generated in the short-circuit plate 40 in an attempt to cancel the magnetic field formed by this current. The eddy current flows in the direction opposite to the current flowing in the electromagnetic coil 49 and so as to wind the insulating connecting shaft 5 in the short circuit plate 40. Therefore, when an eddy current flows, the electromagnetic coil 49 and the short-circuit plate 40 electromagnetically repel each other. In that case, the electromagnetic coil 49 is the same as the fixing portion 24 shown in FIG.
Since it is fixed by the short circuit plate 40,
When hitting 3, the insulating connecting shaft 5 is pushed upward.

In FIG. 7, when the vacuum valve 1 is opened,
Since the repulsive force of the electromagnetic repulsion device 70 is added to the driving force of the operation unit 23, the opening time of the vacuum valve 1 becomes extremely short. The opening time of the vacuum valve 1 was about 20 ms without the electromagnetic repulsion device 70, but the addition of the electromagnetic repulsion device 70 shortens the opening time to about 1 ms. Since the main circuit can be interrupted at high speed, the circuit breaker to which the electromagnetic repulsion device 70 is added is called a high speed circuit breaker.
The compression spring 71 shown in FIG. 8 is provided so as to minimize the gap between the short-circuit plate 40 and the electromagnetic coil 49. If there is a gap here, the generation of eddy current is limited and the electromagnetic repulsive force becomes weak. On the other hand, it is preferable that the gap G is interposed between the short-circuit plate 40 and the fastener 43.
The reason is that the vacuum valve 1 is repeatedly opened and closed, and the fixed contact 2
Even if B or the movable contactor 2A is slightly consumed, the gap G compensates for the consumed amount, so that the contact state between the fixed contactor 2B and the movable contactor 2A at the time of energization is always kept good.

FIG. 9 is a principle diagram for explaining the contact opening mechanism of different conventional high speed circuit breakers. Electromagnetic repulsion device 70
Is attached to the upper part of the operating rod 72. That is, the fastener 43 is fixed to the operation rod 72, and the short-circuit plate 40 and the electromagnetic coil 49 are arranged on the fastener 43. That is, the electromagnetic coil 49 is arranged so as to face the upper surface of the short-circuit plate 40. Other configurations are shown in FIG.
It is the same as that of The detailed configuration of the electromagnetic repulsion device 70 is as follows.
It is the same as that of FIG. 8, but only in the opposite direction. When the vacuum valve 1 is opened, the electromagnetic repulsion device 70 drives the insulating connecting shaft 5 upward in the device of FIG. 7, but in the device of FIG. 9, the electromagnetic repulsion device 70 drives the operation rod 72 downward. ing. Therefore, the principle of contact opening is exactly the same as in the case of FIG.

[0010]

However, the conventional device as described above has a problem that the short circuit plate of the electromagnetic repulsion device is damaged and consumed. That is, in the electromagnetic repulsion device of the conventional device, since the short-circuit plate hits the fastener on the link mechanism side during operation, the short-circuit plate is likely to wear out while the operation is repeated many times. The short-circuit plate is made of copper having a high electric conductivity so that an eddy current can flow therethrough. Copper is a material that is susceptible to mechanical shock and is easily damaged. Therefore, the operating life of the electromagnetic repulsion device was short.

Further, in the configuration of FIG. 7, the electromagnetic repulsion device 70 is used.
Is provided in the middle of the insulating connecting shaft 5, a required insulating distance D is required for the insulating connecting shaft 5 in order to insulate the electromagnetic coil 49 from the high voltage applied to the main circuit terminal 4A. Furthermore, in order to add the electromagnetic repulsion device 70, the insulating connecting shaft 5 must be lengthened by the distance from the electromagnetic repulsion device 70 to the conversion lever 6. for that reason,
It was necessary to lower the vacuum valve 1, and the entire apparatus was raised accordingly.

If the electromagnetic repulsion device 70 is provided on the operation rod 72 side as in the configuration of FIG. 9, the required insulation distance D is from the main circuit terminal 4A to the conversion lever 6, and the insulation connecting shaft 1
As a result, it is not necessary to lengthen the electromagnetic repulsion device 70. However, unlike the configuration of FIG. 7, the electromagnetic repulsion device 70 must be inverted. Therefore, while the compression spring 71 of FIG. 8 always receives the weight of the short-circuit plate 40,
Must be pressed against the electromagnetic coil 49. Short-circuit plate 40
Is used as described above. Specific gravity of copper is 8.9
Since it is large, the short-circuit plate 40 is very heavy. for that reason,
As the compression spring 71, one that requires a large force for compression is selected, but the short circuit plate 4 when the vacuum valve is opened is correspondingly selected.
The repulsive force of 0 becomes weak.

Furthermore, the conventional device does not have a stopper for stopping the movement of the movable shaft when the opening of the vacuum valve is completed. Therefore, the opening gap between the movable contact and the fixed contact of the vacuum valve is opened more than necessary, and the arc length at the time of interruption is extended, leading to a reduction in the life of the vacuum valve. An object of the present invention is to prolong the operating life of the electromagnetic repulsion device. Another object is to reduce the height of the entire device without weakening the repulsive force of the short-circuit plate. Furthermore, a stopper is provided to stop the movement of the movable shaft at the end of the contact opening.

[0014]

In order to achieve the above object, a vacuum valve is formed in a vacuum container in which a fixed contact and a movable contact are arranged so as to be openable and closable with each other. The contacts are respectively joined to one ends of a fixed shaft and a movable shaft in the vacuum container, and the other ends of the fixed shaft and the movable shaft are fixedly or movably pulled out from both ends of the vacuum container to the outside, respectively. The operation part that gives opening and closing operation force to the vacuum valve is connected to the other end of the movable shaft drawn out of the through a link mechanism,
An electromagnetic repulsion device is provided in the link mechanism, and the electromagnetic repulsion device includes a fixed electromagnetic coil, a clasp attached to the link mechanism, and a short-circuit plate arranged between the clasp and the electromagnetic coil. In the high-speed circuit breaker in which the short-circuit plate drives the link mechanism in the opening direction by exciting the electromagnetic coil simultaneously with the opening drive of the operating portion, the electromagnetic repulsion device is short-circuited with the fastener. It is preferable to have a protective plate interposed between the plate and the plate. As a result, the protective plate hits the fastener when the electromagnetic repulsion device is operated, so that the short-circuit plate can be prevented from being damaged. If the protective plate is made of a material resistant to mechanical shock, the life of the electromagnetic repulsion device can be extended.

Further, in such a structure, the link mechanism includes an insulating connecting shaft provided at the other end of the movable shaft, and a conversion lever connected to the side of the insulating connecting shaft opposite to the movable shaft for changing the driving direction. The repulsion device may be provided on the insulating connecting shaft and on the side opposite to the movable shaft from the connecting portion between the insulating connecting shaft and the conversion lever. As a result, the electromagnetic repulsion device has a connecting portion between the insulating connecting shaft and the converting lever,
Since it is not interposed between the movable shaft of the vacuum valve and the vacuum shaft, a short insulating connecting shaft is sufficient. Further, since the short-circuit plate of the electromagnetic repulsion device is placed on the electromagnetic coil, the repulsive force of the short-circuit plate is not weakened.

Further, a vacuum valve is formed in which a fixed contact and a movable contact are arranged so as to be openable and closable in the vacuum container, and the fixed contact and the movable contact are respectively fixed shaft and movable in the vacuum container. Joined to one end of the shaft, the fixed shaft and the other end of the movable shaft are fixedly or movably drawn to the outside from both ends of the vacuum container, respectively, and to the other end of the movable shaft drawn to the outside of the vacuum container. An operation unit for applying an opening / closing operation force to the vacuum valve is connected through a link mechanism, and the link mechanism is provided with an electromagnetic repulsion device. The electromagnetic repulsion device includes a fixed electromagnetic coil and a clamp attached to the link mechanism. It is composed of gold and a short-circuit plate arranged between the clasp and the electromagnetic coil. To drive the link mechanism in the direction of the opening,
An insulating connecting shaft provided with a link mechanism at the other end of the movable shaft, a conversion lever connected in the middle of the insulating connecting shaft to change the driving direction, and an operating rod connected to the side of the insulating lever opposite to the insulating connecting shaft. The operation rod and the conversion lever are connected to each other via a pin penetrating an elongated hole formed in the operation rod, and the operation rod is penetrated to the inside of the coiled wipe spring and one end of the wipe spring is connected. In a high-speed circuit breaker that is fixed to the operating rod and the other end of the wipe spring presses the conversion lever, the line spacing between the turns of the wipe spring is maintained at the specified dimension when the vacuum valve is closed, and the vacuum valve opens. The wire of each turn of the wipe spring may be formed to be in close contact with each other in the polar state. As a result, if the lines of the wipe spring are in close contact with each other,
Since the wipe spring is not compressed any further, the movement of the conversion lever stops. Therefore, this wipe spring acts as a stopper.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a principle diagram illustrating an opening mechanism of a high speed circuit breaker according to an embodiment of the present invention. The electromagnetic repulsion device 81 is provided on the anti-movable shaft 3A side (upper side) of the connecting portion 41A between the insulating connecting shaft 41 and the conversion lever 6. Further, the movable shaft 3A is connected to the main circuit terminal 4A via a flexible conductor 18 which will be described later.

FIG. 2 is an enlarged cross-sectional view of the essential parts showing the structure of the electromagnetic repulsion device of FIG. Protection plate 62 of electromagnetic repulsion device 81
Is arranged on the lower surface of the fastener 43 via the compression spring 60,
The short-circuit plate 61 is interposed between the protection plate 62 and the electromagnetic coil 49. The electromagnetic coil 49 is fixed to the fixed frame 45 via the fixing portion 54. Others of FIG. 1 and FIG. 2 are the same as the conventional configuration of FIG. 7 and FIG. The same parts as those of the related art are designated by the same reference numerals, and detailed description thereof will be omitted.
Since the electromagnetic repulsion device 81 is not interposed between the connecting portion 41A and the movable shaft 3A of the vacuum valve 1, only the required insulating distance D (FIG. 1) is required for the insulating connecting shaft 41. You just need a short one. Further, as shown in FIG. 2, the short-circuit plate 61 and the protection plate 62 of the electromagnetic repulsion device 81 are connected to the electromagnetic coil 4
Since it is mounted on the compression spring 9, gravity is not applied to the compression spring 60. Therefore, the compression spring 60 may have a weak compression force, and as a result, the repulsive force of the short circuit plate 40 is not weakened. The short-circuit plate 61 is made of a copper material having a high electric conductivity as described above, but the protective plate 62 is made of a material that is light and durable against mechanical shock, such as reinforced aluminum. As a result, the protective plate 62 abuts the fastener 43 when the electromagnetic repulsion device 81 operates, so that the short-circuit plate 61 can be prevented from being damaged. Protective plate 6
If 2 is made of a material that is resistant to mechanical shock, the operation repeating life of the electromagnetic repulsion device 81 can be extended. If the protective plate 62 is made as light as possible, the electromagnetic repulsive force can be increased.

FIG. 3 is a sectional view showing the structure of the apparatus shown in FIG. Truck frame 47 with wheels 48 and handles 47A
In addition, the operating section 23 (the internal structure is omitted) and the insulating frame 46.
And are fixed, and a fixed frame 45 is provided on the upper part. The vacuum valve 1 is housed in the insulating frame 46,
The main circuit terminals 4A and 4B are drawn out. The movable shaft 3A of the vacuum valve 1 includes an insulating connection shaft 41 that is a link mechanism,
It is connected to the operation portion 23 via the conversion lever 6, the operation rod 7, and the conversion lever 8. An upper part of the insulating connecting shaft 41 penetrates the fixed frame 45, and an electromagnetic repulsion device 81 is provided on the fixed frame 45. On the fixed frame 45, the control power supply 12 having the capacitor 16 is also mounted.

FIG. 4 is a view on arrow A of FIG. Wheels 48
An insulating frame 46 is provided on a trolley frame 47 provided with, and the vacuum valve 1 is housed in the insulating frame 46. Further, the fixed frame 4 on the upper part of the bogie frame 47
5, an electromagnetic repulsion device 81 is placed. A circumferential flexible conductor 18 and a U-shaped connection fitting 53 are fixed to the upper end surface of the movable shaft 3A of the vacuum valve 1. The main circuit terminal 4A is fixed to the upper portion of the flexible conductor 18. The axial movement of the movable shaft 3A is absorbed by the deformation of the flexible conductor 18 itself.
On the other hand, the connecting fitting 53 is connected to the insulating connecting shaft 4 via the pin 52.
1, the insulating connecting shaft 41 stands up, and the fasteners 43 are attached to the upper part thereof.

Returning to FIG. 3, since the electromagnetic repulsion device 81 is very close to the control power source 12, the connecting line from the control power source 12 to the electromagnetic coil (not shown) can be very short. If this connecting line is too long, a loss occurs while the electric charge charged in the capacitor 16 reaches the electromagnetic coil due to its inductance component, and the electric charge must be charged more than necessary. Since the configuration of FIG. 3 reduces energy loss, the capacity of the capacitor 16 and the power supply voltage can be reduced, and the control power supply becomes compact. Further, only one vacuum valve 1 is arranged on the carriage frame 47 of FIG.
It is also possible to arrange a plurality of them in parallel with each other. When the main circuit is a three-phase AC or a DC having a plurality of lines, the vacuum valves 1 may be collectively housed in the carriage frame 47. In that case, the electromagnetic repulsion device 81 also includes one fixed frame 45.
Multiple units can be lined up at the same time.

FIG. 5 is an enlarged cross-sectional view of an essential part showing the structure of the wipe spring 42 of FIG. A pin 7B that penetrates the elongated hole 7A of the operation rod 7 penetrates both the conversion lever 6 and the roller 59 to connect the conversion lever 6 and the operation rod 7. A compressible wipe spring 42 similar to the compressible wipe spring 27 described with reference to FIG. 8 is arranged above the operation rod 7. The lower spring bearing 57 is fixed to the operating rod 7, and the upper spring bearing 55 is supported by the operating rod 7 so as to be freely movable in the axial direction. The wipe spring 42 interposed between the spring receivers 55 and 57 pushes up the roller 59 via the spring receiver 55 and constantly urges the conversion lever 6 to rotate counterclockwise. In FIG. 5, the vacuum valve is in a closed state, and in that state, the line spacing of each turn of the wipe spring 42 is secured by a predetermined dimension d.

FIG. 6 is an enlarged cross-sectional view of an essential part showing the structure of the wipe spring 42 shown in FIG. 5 when the vacuum valve finishes opening. The lines of each turn of the wipe spring 42 are in close contact with each other, and the wipe spring 42 is not compressed any further. Since the conversion lever 6 stops moving at this position, the wipe spring 42 serves as a stopper. This prevents the opening gap between the movable contact and the fixed contact of the vacuum valve from opening more than necessary, and extends the life of the vacuum valve.

[0024]

As described above, according to the present invention, since the electromagnetic repulsion device is provided with the protective plate interposed between the fastener and the short-circuit plate, the short-circuit plate is not damaged and the number of times the electromagnetic repulsion device operates. The life has been extended. In such a configuration,
The link mechanism includes an insulating connecting shaft provided at the other end of the movable shaft, and a conversion lever connected to the insulating connecting shaft to change the driving direction. The electromagnetic repulsion device is provided on the insulating connecting shaft and the insulating connecting shaft. Is provided on the side opposite to the movable shaft from the connecting portion between the conversion lever and the conversion lever. As a result, the insulating connecting shaft can be short, and the entire device can be lowered to reduce the cost. Also, the repulsive force of the short-circuit plate becomes stronger.

Further, in such a structure, the line spacing of each turn of the wipe spring is ensured to be a predetermined dimension when the vacuum valve is closed, and the lines of each turn of the wipe spring are closely contacted when the vacuum valve is open. It is formed. Thereby,
The wipe spring plays the role of a stopper and extends the life of the vacuum valve.

[Brief description of drawings]

FIG. 1 is a principle diagram illustrating an opening mechanism of a high speed circuit breaker according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing the configuration of the electromagnetic repulsion device of FIG.

FIG. 3 is a cross-sectional view showing the configuration of the entire apparatus of FIG.

FIG. 4 is a view taken in the direction of arrow A in FIG. 3;

5 is an enlarged cross-sectional view of an essential part showing the configuration of the wipe spring of FIG.

6 is an enlarged cross-sectional view of an essential part showing the configuration of the wipe spring of FIG. 5 when the vacuum valve has finished opening.

FIG. 7 is a principle diagram illustrating a contact opening mechanism of a conventional high speed circuit breaker.

8 is an enlarged sectional view of an essential part showing the configuration of the apparatus shown in FIG.

FIG. 9 is a principle diagram illustrating an opening mechanism of a conventional different high-speed circuit breaker.

[Explanation of symbols]

1: vacuum valve, 2A: movable contact, 2B: fixed contact, 3A: movable shaft, 3B: fixed shaft, 4A, 4B: main circuit terminal, 41: insulating connection shaft, 6, 8: conversion lever, 7: Operation rod, 12: Control power supply, 23: Operation part, 40, 6
1: Short-circuit plate, 27, 42: Wipe spring, 43: Fastener, 45: Fixed frame, 49: Electromagnetic coil, 62: Protective plate, 70, 81: Electromagnetic repulsion device

Claims (3)

[Claims] 1. A vacuum valve is formed in which a fixed contact and a movable contact are arranged so as to be openable and closable in a vacuum container, and the fixed contact and the movable contact are respectively fixed shaft and movable in the vacuum container. Joined to one end of the shaft, the fixed shaft and the other end of the movable shaft are fixedly or movably drawn to the outside from both ends of the vacuum container, respectively, and to the other end of the movable shaft drawn to the outside of the vacuum container. An operation unit for applying an opening / closing operation force to the vacuum valve is connected through a link mechanism, and the link mechanism is provided with an electromagnetic repulsion device. The electromagnetic repulsion device includes a fixed electromagnetic coil and a clamp attached to the link mechanism. It is composed of gold and a short-circuit plate arranged between the clasp and the electromagnetic coil, and the short-circuit plate is linked by exciting the electromagnetic coil at the same time as the opening drive of the operating portion. In high-speed circuit breaker comprising structure was driven in the direction of opening, the electromagnetic repulsion devices, high-speed circuit breaker, characterized in that a protective plate interposed between the fasteners and the short-circuiting plate. 2. The device according to claim 1, wherein the link mechanism includes an insulating connecting shaft provided at the other end of the movable shaft, and a conversion lever connected in the middle of the insulating connecting shaft to change the driving direction. A high-speed circuit breaker, characterized in that the electromagnetic repulsion device is provided on the insulating connecting shaft and is provided on the side opposite to the movable shaft from the connecting portion between the insulating connecting shaft and the conversion lever. 3. A vacuum valve is formed in which a fixed contact and a movable contact are arranged so as to be openable and closable in a vacuum container, and the fixed contact and the movable contact are respectively fixed shaft and movable in the vacuum container. Joined to one end of the shaft, the fixed shaft and the other end of the movable shaft are fixedly or movably drawn to the outside from both ends of the vacuum container, respectively, and to the other end of the movable shaft drawn to the outside of the vacuum container. An operation unit for applying an opening / closing operation force to the vacuum valve is connected through a link mechanism, and the link mechanism is provided with an electromagnetic repulsion device. The electromagnetic repulsion device includes a fixed electromagnetic coil and a clamp attached to the link mechanism. It is composed of gold and a short-circuit plate arranged between the clasp and the electromagnetic coil, and the short-circuit plate is linked by exciting the electromagnetic coil at the same time as the opening drive of the operating portion. The link mechanism is driven in the direction of opening, the link mechanism is provided at the other end of the movable shaft, the conversion lever that is connected in the middle of this insulation connection shaft to change the driving direction, and the reverse of this conversion lever. An operating rod connected to the insulating connecting shaft side is provided, and the operating rod and the conversion lever are connected via a pin penetrating an elongated hole formed in the operating rod, and the operating rod is inside the coiled wipe spring. In the high-speed circuit breaker in which one end of the wipe spring is fixed to the operating rod and the other end of the wipe spring presses the conversion lever, the line spacing of each turn of the wipe spring is the closed state of the vacuum valve. A high-speed circuit breaker, which has a predetermined dimension and is formed so that the turns of the wipe spring are in close contact with each other when the vacuum valve is open.