JP2001210195A - High-speed switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-speed switch with high breaking capability, which can minimize bouncing at the vacuum valve contact without making the device large. SOLUTION: This device comprises a high-speed breaker H having a contact 15 that opens at high speed, a linear operating mechanism L that operates almost simultaneously with the breaking of the breaker, and a coupling 6 connected to the moving part 14 of the linear operating mechanism L and having a guide hole 7, and a wipe mechanism W connected with a moving shaft guide 2 connected to a moving contact of the above high-speed breaker and having a moving shaft guide 5 to be inserted into the guide hole 7 of the coupling 6. The wipe mechanism W is so constituted that it has a bounce reduction means (22 and 23) which reduces bouncing when breaking the contact 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed switch provided for interrupting a current at a high speed in a power distribution network or the like.

[0002]

2. Description of the Related Art A high-speed switch is designed to cut off a large current in order to protect a power transmission system and a distribution system in the event of a ground fault or a short circuit between lines.
Many substations have a vacuum valve type with excellent shutoff capability, and the configuration is shown in FIG. 11 (Japanese Patent Application No. 11-105375).

FIG. 11 is a schematic view of a conventional three-phase high-speed switch, which shows a closed state. As shown in this figure, the high-speed switch includes a high-speed opening portion H, a wipe mechanism W, and a linear operating member. And a mechanism section L.

The high-speed opening portion H includes a vacuum valve 1, a vacuum valve movable shaft 2, an electromagnetic repulsion coil 3, and a repulsion ring 4. The wiping mechanism W includes a movable shaft guide 5 coupled to the repulsion ring 4, an insulating coupling 6, a wiping spring 8, a wiping spring presser 9, and a shock absorbing and damping rubber 10 as a cushioning material. The coupling 6 has a guide hole 7 for guiding the movable shaft guide 5. The linear operating mechanism L comprises a permanent magnet 11, an open circuit spring 12, a solenoid 13, and a linear operating mechanism movable section 14 connected to the coupling 6 (Japanese Patent Application No. 9-175785, Japanese Patent Application Laid-Open No. 11-72179). Gazette). The open circuit spring 12 is a non-linear spring in which the relationship between length and spring force shows non-linear characteristics.

In the closed state shown in FIG. 11, a vacuum valve contact 15 in the vacuum valve 1 is in contact with a predetermined wipe load by a wipe spring 8. At this time, the linear operation mechanism movable part
By setting the suction force of 14 larger than the sum of the opening force by the wipe spring 8 and the opening spring 12 and the total mass of the movable portion,
The closed state is maintained. In a high-speed switch with such a configuration, the high-speed opening operation when the fault current is interrupted is shown in FIG.
This will be described below. FIG. 12 shows one phase.

FIG. 12A shows the closed state of the high-speed switch. When an accident is detected in this state, a control device (not shown) gives a high-speed opening command to the thyristor switch 16, a current is supplied from the capacitor 17 to the electromagnetic repulsion coil 3, and the electromagnetic repulsion coil 3 is excited. This allows
Electromagnetic repulsion is applied to the repulsion ring 4 fastened to the vacuum valve movable shaft 2 and operating integrally, and the vacuum valve contact 15 starts opening at a high speed. At the same time, the movable shaft guide 5 of the vacuum valve 1 (see FIG. 11) moves downward on the center axis of the vacuum valve along the guide hole 7 in the coupling 6 (opening direction) in FIG. Compress the shock absorption damping rubber
Collide with 10. This state is shown in FIG.

At this time, the upward movement of the movable shaft 2 of the vacuum valve is suppressed by the shock absorbing and damping rubber 10, and at the same time, the coupling 6 is pushed down through the wipe spring 8 and the shock absorbing and damping rubber 10. . On the other hand, the solenoid 13 of the linear operating mechanism is similarly supplied with an opening command by the control device in the event of an accident, is excited in a direction to repel the permanent magnet 11, and the linear operating mechanism is movable by the spring force of the open circuit spring 12. Department
14 is driven in the opening direction (downward in the figure). When the wipe spring retainer 9 comes into contact with the collar 18 via the coupling 6, the vacuum valve contact 15 is further opened via the vacuum valve movable shaft 2. This state is shown in FIG.

Thereafter, the inertia of the movable shaft 2 of the vacuum valve and the electromagnetic force of the solenoid 13 open the vacuum valve contact 15 until a predetermined gap is reached. A certain gap,
Even after the excitation of the electromagnetic repulsion coil 3 and the solenoid 13 is released, the spring force of the open circuit spring 12 remains the vacuum valve self-closing force and the permanent magnet.
Since it is set to be larger than the sum of the suction forces of 11, the vacuum valve contact 15 maintains the open circuit state. This state is shown in FIG.
It is shown in (D).

FIG. 13 shows an example of the high-speed opening characteristics of such a conventional high-speed switch. That is, the electromagnetic repulsion coil 3
Is excited, the vacuum valve contact 15 starts to operate as in the vacuum valve stroke 19, and after time T1, the inertia force due to the collision of the vacuum valve movable shaft 2 with the wipe mechanism W and the solenoid
With the electromagnetic force of 13, the linear operation mechanism movable section 14 starts operating as shown by the linear operation mechanism stroke 20. However, if the shock energy absorbing ability of the shock absorbing rubber 10 is small or the dynamic spring constant is large, the vacuum valve contact 15 rebounds near the closed position as shown in the vacuum valve stroke 19 in FIG. I can. Then, at time T2, the collar 18 comes into contact with the wipe spring retainer 9 and starts to operate again in the opening direction.

[0010]

The conventional high-speed switch configured as described above has the following problems. That is, as described above, if the shock energy absorbing ability of the shock absorbing rubber 10 is small or the dynamic spring constant is large, the vacuum valve contact 15 rebounds to near the closing position, and the possibility of re-arcing may occur. is there. In addition, in order to increase the shock energy absorbing ability of the shock absorbing and damping rubber 10, it is necessary to increase the volume of the shock absorbing and damping rubber 10 itself,
High-speed switches become larger.

In order to control the rebound of the vacuum valve contact 15, the energizing time to the electromagnetic repulsion coil 3 may be extended to excite it for a long time. However, it is necessary to increase the charge capacity of the capacitor 17. The whole equipment becomes large and the cost becomes high. Further, in order to reduce the amount of rebound of the vacuum valve contact 15, the spring force of the open circuit spring 12 is increased, the linear operating mechanism movable portion 14 is driven at a high speed, and the vacuum valve contact 15
Even if the spring bounces, it is sufficient to drive the opening direction by the wipe spring retainer 9 while the amount of the spring bounce is small. This leads to higher costs. SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-speed switch with excellent shut-off performance that can suppress the rebound of a vacuum valve contact without increasing the size.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a high-speed opening section having a contact that opens at a high speed, and to open the high-speed opening section substantially simultaneously with the opening. A linear operating mechanism that operates, a coupling having a guide hole connected to a movable portion of the linear operating mechanism, and a movable shaft coupled to a movable contact of the high-speed opening portion are coupled to a guide hole of the coupling. A wipe mechanism having a movable shaft guide to be inserted, wherein the wipe mechanism is provided with a rebound reducing means for reducing rebound when the contact is opened.

According to a second aspect of the present invention, the rebound reducing means includes a low resilience member attached to the coupling, and an engagement groove formed at the base of the movable shaft guide to engage with the low resilience member. Configuration.

According to a third aspect of the present invention, the engagement groove is formed over a flange which is provided at a joint between the movable shaft and the movable shaft guide and receives a wipe spring which acts on the movable shaft guide in a direction of pulling out the guide hole. Configuration.

According to a fourth aspect of the present invention, the rebound reducing means includes an engagement groove formed at a bottom of a guide hole formed in the coupling, and an engagement groove attached to a tip of a movable shaft guide. And a low resilience member.

According to a fifth aspect of the present invention, the rebound reducing means comprises an air damper formed by a guide hole formed in the coupling and a movable shaft guide inserted into the guide hole.

According to a sixth aspect of the present invention, the air damper is provided with a check valve provided in a communication passage communicating the bottom of the guide hole formed in the coupling with the outside of the coupling, and keeping the airtightness in the guide hole. And a movable shaft guide to enter and exit.

According to a seventh aspect of the present invention, the air damper includes a ventilation hole provided on a side wall of the guide hole formed in the coupling, and a movable shaft guide which enters and exits the guide hole while keeping the airtight. And

According to an eighth aspect of the present invention, the air damper includes a piston which is attached to the tip of the movable shaft guide, has a check valve, and comes into sliding contact with the inner wall of the guide hole of the coupling while maintaining airtightness.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-speed switch according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing a high-speed switch according to a first embodiment of the present invention, showing a three-phase closed state. FIG. 2 is an exploded view showing a high-speed opening portion H and a wiping mechanism W for one phase in the high-speed switch shown in FIG.

The high-speed switch according to the present embodiment has the same high-speed opening portion H as the conventional one, and has a vacuum valve 1 and a vacuum valve movable shaft 2, and an electromagnetic repulsion coil 3 around the vacuum valve 1. The repulsion ring 4 is mounted on the movable shaft 2 of the vacuum valve. At the tip of the vacuum valve movable shaft 2,
A movable shaft guide 5 constituting the wipe mechanism W is fitted, and a flange 21 is attached between the two.
10-326546).

The movable shaft guide 5 is a coupling 6 made of an insulator.
The wipe spring 8 is disposed between the coupling 6 and the collar 21. The coupling 6 has a wipe spring retainer 9 and a low resilience member 22 made of low resilience rubber (for example, Honey Nite manufactured by Naigai Rubber Co., Ltd.) fixed thereto. The wipe mechanism unit W configured as described above includes a permanent magnet
11, open circuit spring 12, solenoid 13, and linear operating mechanism movable part
It is connected to a linear operation mechanism L consisting of fourteen.

In the high-speed switch having such a configuration,
A groove 23 is formed at the connection between the movable shaft guide 5 and the collar 21. Further, the low-rebound rubber constituting the low-repulsion member 22 is a vulcanized rubber having a low rebound resilience, excellent energy absorption, rapid vibration damping, and excellent vibration damping performance. Next, the operation of the high-speed switch according to this embodiment configured as described above will be described with reference to FIGS. 1, 2, 3, and 4. FIG.

Since the high-speed opening operation of the high-speed switch according to the present embodiment is almost the same as that of the conventional high-speed switch, only different portions will be described. FIG. 3 shows the deformation characteristics of the shock absorbing rubber 10 used in the conventional high-speed switch and the low-rebound member 22 made of the low-rebound rubber used in the high-speed switch according to the present embodiment. The amount of deformation when a weight of the same weight collides with the shock absorbing and damping rubber 10 and the low resilience member 22 is shown by a time-of-day calendar. A broken line 24 shows a deformation characteristic curve of the shock absorbing rubber 10, and a solid line 25 shows a deformation characteristic of the low resilience member 22. This characteristic is based on actual measurements. As can be seen from this figure, the low-repulsion member 22 has a characteristic that it takes a long time to restore the original shape after absorbing the collision force (hereinafter, referred to as a slow recovery characteristic).

FIG. 2 shows a state in which the collar 21 collides with the low-repulsion member 22 during the high-speed opening operation, and the cross section of the low-repulsion member 22 is deformed into a barrel shape. Since the low resilience member 22 is deformed into a barrel shape and enters the groove 23, it takes time until the original shape is restored as described with reference to FIG. 3, so that the movable shaft guide 5 resists the bouncing operation. Will generate force. That is, the low-repulsion member 22 functions as a damper in both directions of the high-speed opening operation and the rebound, and acts as a rebound reducing mechanism.

FIG. 4 shows the stroke characteristics of the vacuum valve contact 15 and the linear operating mechanism movable part 14 at this time. Curve 19a is the stroke of the vacuum valve contact 15, and curve 20a is the stroke of the linear operating mechanism movable part 14. The vacuum valve contact 15 started to operate in response to the opening command collides with the low resilience member 22 (time T1), and does not operate at high speed in the rebound direction because the damping force is applied by the rebound reduction function.
In 2, the wipe spring retainer 9 comes into contact with the collar 21, and strokes in the opening direction together with the linear operating mechanism movable portion 14.

Therefore, according to the present embodiment, the damper force acts also in the direction in which the vacuum valve contact 15 rebounds due to the slow recovery characteristic of the low-repulsion member 22, so that it is necessary to increase the volume of the elastic body for absorbing shock. There is no. Further, since it is not necessary to continue the electromagnetic repulsion for a long time, the capacitance of the capacitor can be small, and the size and cost of the high-speed switch can be reduced.

FIG. 5 is a cross-sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the second embodiment of the present invention, and shows a state during the high-speed opening. The same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, the low resilience member 22 made of low resilience rubber is used for the coupling 6
And the deformation of the low resilience member 22 is limited only to the inside by the hole 26, so that the low rebound member 22 is more engaged with the groove 23 of the movable shaft guide 5. I do.

As described above, according to the present embodiment, since the deformation of the low resilience member 22 can be efficiently brought to the groove 23 side, the rebound of the vacuum valve contact can be suppressed, and the first embodiment can be used. The same effect as in the embodiment can be obtained.

FIG. 6 is a cross-sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the third embodiment of the present invention, and shows a state during the high-speed opening. The same reference numerals are given to the same or corresponding portions as the components of the first embodiment. That is, the groove 27 is formed at the connecting portion between the collar 21 and the movable shaft guide 5, and the groove 27 is continuous with the groove 23 of the movable shaft guide 5. By doing so, the deformation of the low resilience member 22 is moved toward the groove 23, and the engagement area can be increased.

Therefore, according to the present embodiment, the groove 27
Thereby, the deformation of the low resilience member 22 can be efficiently brought to the groove 23 side. Therefore, the same effect as in the first embodiment can be obtained.

FIG. 7 is a sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the fourth embodiment of the present invention, and shows a state in the middle of high-speed opening. The same reference numerals are given to the same or corresponding parts as the constituent parts of the first embodiment. That is, the low resilience member 22
Is fixed to the tip of the movable shaft guide 5 and has a guide hole 7.
A groove 28 is formed at the bottom of the. In such a configuration, when the low resilience member 22 collides with the bottom of the guide hole 7, it deforms into a barrel shape and engages with the groove 28.

As described above, according to the present embodiment, since the rebound reducing mechanism can be constituted by the engagement between the low repulsion member 22 and the groove 28, the same effect as in the first embodiment can be obtained. Can be.

FIG. 8 is a cross-sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the fifth embodiment of the present invention, and shows a state during the high-speed opening. The same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

That is, in the high-speed switch according to this embodiment, a compression chamber 31 is formed at the bottom of the guide hole 7 of the coupling 6, and a communication passage 29 communicating from the compression chamber 31 to the outside of the coupling 6 is provided. In this configuration, a check valve 30 is provided in the middle of the communication passage 29.

In the high-speed switch having such a configuration, when the electrode is opened at a high speed, the air in the compression chamber 31 at the bottom of the guide hole 7 is compressed by the movable shaft guide 5, but the check valve 30 is increased in pressure. When opened, the air in the compression chamber 31 is released to the outside. However, when the vacuum valve contact 15 operates in the direction in which it rebounds, that is, when the air in the compression chamber 31 tries to expand, the check valve 30 closes, and the pressure in the compression chamber 31 becomes negative pressure, generating resistance to the rebound. Stop the bouncing. However, since air gradually flows in from the gap between the movable shaft guide 5 and the guide hole 7, the air in the compression chamber 31 becomes equal to the atmospheric pressure after a certain time, and is pushed back by the spring force of the wipe spring 8. .

As described above, in this embodiment, the check valve 30 and the compression chamber 31 are arranged in the coupling 6, so that a kind of air damper is formed. Similar effects can be obtained.

FIG. 9 is a cross-sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the sixth embodiment of the present invention, and shows a state during the high-speed opening. In addition, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment and the fifth embodiment.

That is, in the high-speed switch according to the present embodiment, the piston 32 is fixed to the tip of the movable shaft guide 5, and the compression chamber 31 is defined below the piston 32. A vent 32 is provided in the piston 32. A check valve 34 is arranged around the movable shaft guide 5 to restrict air flowing out from the vent hole 33.

In the high-speed switch having such a configuration, when the electrode is opened at a high speed, the air in the compression chamber 31 is displaced by the piston.
The air is compressed by the check valve 32, but the check valve 34 is opened due to an increase in pressure, and the air in the compression chamber 31 is released to the outside. However, when the vacuum valve contact 15 operates in the direction in which it rebounds, the air in the compression chamber 31 expands to a negative pressure, the check valve 30 closes, and a resistance is generated against the rebound, thereby stopping the rebound. However, piston 32 and coupling 6
Since the air gradually flows in from the gap between the inner wall and the inner wall, the air in the compression chamber 31 becomes equal to the atmospheric pressure after a certain time, and is pushed back by the spring force of the wipe spring 8.

As described above, according to the present embodiment, the compression chamber 31 is formed by fixing the piston 32 having the ventilation hole 33 at the tip of the movable shaft guide 5, and the opening and closing of the ventilation hole 33 in one direction is checked. Since the valve 34 is arranged, a kind of air damper is formed, the rebound of the vacuum valve contact 15 is suppressed, and the same effect as in the first embodiment can be obtained.

FIG. 10 is a cross-sectional view showing the vicinity of the vacuum valve 1 and the coupling 6 in the high-speed switch according to the seventh embodiment of the present invention, showing a state during the high-speed opening. In addition, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment and the fifth embodiment.

In the high-speed switch according to the present embodiment, a compression chamber 31 is defined at the bottom of the guide hole 7 of the coupling 6, the shock absorbing and damping rubber 10 is arranged, and a ventilation hole 35 is formed on the side surface of the guide hole 7. According to the movement of the movable shaft guide 5,
The total area of the air holes 35 from which air flows out of the compression chamber 31 is gradually reduced.

In the high-speed switch according to the present embodiment having the above-described structure, at the time of high-speed opening, the air in the compression chamber 31 is compressed by the movable shaft guide 5, but is discharged to the outside through the vent hole 35. When the movable shaft guide 5 collides with the shock absorbing rubber 10, the ventilation holes 34 are completely closed by the movable shaft guide 5. Then, when the vacuum valve contact 15 operates in the direction of rebound, the air in the compression chamber 31 expands to a negative pressure, but since there is no air inflow from the vent hole 35, a resistance is generated against the rebound, and the rebound is generated. Stop. However, since air gradually flows in from the gap between the movable shaft guide 5 and the guide hole 7, the air in the compression chamber 31 becomes equal to the atmospheric pressure after a certain time, and is pushed back by the spring force of the wipe spring 8. .

As described above, according to the present embodiment,
Since the compression chamber 31 is defined at the bottom of the guide hole 7 and a plurality of ventilation holes 35 are arranged on the side surface of the guide hole 7, a kind of air damper functions and the same effect as in the first embodiment is obtained. Obtainable.

As described above, in the high-speed switch according to the embodiments of the present invention, a small rebound reduction mechanism can be realized by the slow recovery characteristic of the low-repulsion member or the action of the air damper, and the high-speed switch can be downsized. It can contribute to cost reduction.

In the above-described embodiments, the high-speed opening section has been described as being constituted by a vacuum valve.
Any switch element having the same high-speed opening characteristics as the vacuum valve can be used instead of the vacuum valve.

[0048]

The high-speed switch of the present invention has a high-speed opening section having contacts that open at a high speed, a linear operation mechanism that operates almost simultaneously with the opening of the high-speed opening section, and a linear operation mechanism. A wiping mechanism section having a coupling coupled to the movable section and having a guide hole, and a movable axis guide coupled to a movable shaft coupled to the movable contact of the high-speed opening section and inserted into the guide hole of the coupling; The wipe mechanism is provided with a rebound reducing means for reducing the rebound when the contacts are opened, so that the rebound of the vacuum valve contacts can be reduced without increasing the size, and the breaking performance is excellent. High speed switch can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a high-speed switch according to a first embodiment of the present invention, showing a closed state;

FIG. 2 is a cross-sectional view showing a main part of the high-speed switch according to the first embodiment during opening of the high-speed switch;

FIG. 3 is a diagram comparing the deformation characteristics of a shock absorbing rubber used for a conventional high-speed switch and the low-repulsion member used for the high-speed switch of the first embodiment.

FIG. 4 is a diagram comparing stroke characteristics of a vacuum valve contact and a linear operation mechanism movable portion of the high-speed switch according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of a high-speed switch according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a main part of a high-speed switch according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing a main part of a high-speed switch according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing a main part of a high-speed switch according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view showing a main part of a high-speed switch according to a sixth embodiment of the present invention.

FIG. 10 is a sectional view showing a main part of a high-speed switch according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view showing a conventional high-speed switch, showing a closed state;

12A and 12B show the operation of a conventional high-speed switch, wherein FIG. 12A shows a closed state, FIG. 12B shows an initial opening state, FIG. 12C shows a middle opening state, and FIG. 12D shows a late opening state. .

FIG. 13 is a diagram showing the operating characteristics of a conventional high-speed switch, showing the stroke of a vacuum valve and the stroke of a movable portion of a linear operating mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vacuum valve, 2 ... Vacuum valve movable shaft, 3 ... Electromagnetic repulsion coil, 4 ... Repulsion ring, 5 ... Movable shaft guide, 6 ... Coupling, 7 ... Guide hole, 8 ... Wipe spring, 9 ... Wipe spring presser, 10… Shock absorbing rubber, 11… Permanent magnet, 12…
Open circuit spring, 13 ... solenoid, 14 ... movable part of linear operating mechanism, 15 ... vacuum valve contact, 16 ... thyristor switch, 17
... condenser, 18 ... collar, 19 ... vacuum valve stroke,
19a: Vacuum valve stroke, 20: Linear operating mechanism stroke, 20a: Linear operating mechanism stroke, 21: Collar
22: low rebound member, 23: groove, 24: deformation characteristic curve of shock absorbing rubber, 25: deformation characteristic of low rebound rubber, 26: hole, 27 ...
Groove, 28 ... Groove, 29 ... Communication passage, 30 ... Check valve, 31 ... Compression chamber, 32 ... Piston, 33 ... Vent, 34 ... Check valve, 35 ... Vent, H ... High-speed opening, L ... Linear Operation mechanism, W ... wipe mechanism.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Yoshinobu Ishikawa 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Yoshinobu Taniguchi 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kawasaki, Japan 5G026 LA03 LB03 LB04 5G028 AA17 DB07 DB09 EB08

Claims (8)

[Claims] 1. A high-speed opening section having a contact that opens at a high speed, a linear operating mechanism that operates almost simultaneously with the opening of the high-speed opening section, and a guide connected to a movable section of the linear operating mechanism. A wiper mechanism having a coupling having a hole and a movable shaft guide coupled to a movable shaft coupled to a movable contact of the high-speed opening portion and inserted into a guide hole of the coupling; A high-speed switch, further comprising means for reducing rebound when the contact is opened. 2. The rebound reducing means includes a low resilience member attached to a coupling, and an engagement groove formed at a root portion of a movable shaft guide and engaging with the low resilience member. The high-speed switch according to claim 1. 3. The engagement groove is formed at a joint between the movable shaft and the movable shaft guide, and is formed over a flange that receives a wipe spring that applies a force in a direction of pulling the movable shaft guide from the guide hole. 3. The high-speed switch according to claim 2, wherein 4. A rebound reducing means includes: an engagement groove formed at a bottom of a guide hole formed in a coupling; and a low-repulsion member attached to a tip of a movable shaft guide and engaged with the engagement groove. The high-speed switch according to claim 1, further comprising: 5. The high-speed switch according to claim 1, wherein the rebound reducing means is an air damper formed by a guide hole formed in the coupling and a movable shaft guide inserted into the guide hole. 6. A check valve provided in a communication passage communicating the bottom of a guide hole formed in the coupling with the outside of the coupling, a movable shaft guide entering and exiting the guide hole while maintaining airtightness in the air damper. The high-speed switch according to claim 5, further comprising: 7. The air damper includes a ventilation hole provided in a side wall of a guide hole formed in the coupling, and a movable shaft guide that enters and exits the guide hole while keeping the airtight. 5. The high-speed switch according to 5. 8. The air damper according to claim 5, further comprising a piston attached to a tip of the movable shaft guide, having a check valve, and slidingly contacting the inner wall of the guide hole of the coupling while maintaining airtightness. High speed switch.