JP3456137B2 - High speed circuit breaker - Google Patents

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. Regarding circuit breakers.

[0002]

2. Description of the Related Art FIG. 14 is a side view showing the structure of a conventional high speed circuit breaker. Bogie frame 47 with wheels 48
In addition, the operating section 23 (the internal structure is omitted) and the insulating frame 46.
And are fixed, and a fixing frame 45
Is provided. Insulation frame 46 has a vacuum valve 1
The movable shaft 3A and the fixed shaft 3B are pulled out from the vacuum valve 1. Main circuits (not shown) are connected to the movable shaft 3A and the fixed shaft 3B, respectively. The movable shaft 3A of the vacuum valve 1 is connected to the operating portion 23 via a link mechanism 4 including an insulating rod 5, a conversion lever 6 and an operating rod 7. An electromagnetic repulsion device 70 including a short circuit plate 40 and an electromagnetic coil 49 is added to the insulating rod 5. The electromagnetic coil 49 of the electromagnetic repulsion device 70 is fixed to the fixed frame 45, and the fastener 43 fixed to the insulating rod 5 is provided on the upper portion of the short-circuit plate 40.

FIG. 15 is a principle diagram for explaining the opening mechanism of the high speed circuit breaker of FIG. The movable shaft 1A from the movable contactor 1A and the fixed contactor 1B in the vacuum valve 1 respectively.
And the fixed shaft 3B are pulled out to the outside, and the upper end of the movable shaft 3A is connected to the operation rod 7 via the conversion lever 6. Further, the other end of the operating rod 7 is connected to the operating portion 23. In the operation portion 23, the lower end of the operation rod 7 is rotatably connected to the lever 8 integrated with the opening / closing shaft 8A,
Further, another lever 25 is formed integrally with the opening / closing shaft 8A. The opening / closing shaft 8A itself is rotatably supported by a bearing (not shown) of the operation unit 23. The left end of the lever 25 engages with the upper end of the lever 10, and one end of the tension spring 9 is hooked on a pin 25A passing through the lever 25. The other end of the tension spring 9 is fixed to the fixed end 23A of the operating portion 23, and the lever 2
5 is always biased to rotate counterclockwise.

Further, the apparatus shown in FIG. 15 is additionally provided with an electromagnetic repulsion device 70 constituted by penetrating the insulating rod 5 with the short-circuit plate 40 and the electromagnetic coil 49. On the other hand, lever 10
A trip bar 11 is disposed so as to face the lower end of the trip coil 11, and a trip coil 20 that drives the trip bar 11 to the right by being excited is provided. In the upper part of FIG. 15, the control power supply 12 for exciting the electromagnetic coil 49 and the trip coil 20 is shown. Capacitor 16 of control power supply 12
Is charged by a DC power supply 17, and both ends of the capacitor 16 are connected to an electromagnetic coil 49 via an opening / closing switch 15 such as a thyristor. Both ends of the DC power supply 13 are also connected to the trip coil 20 via the open / close switch 14.

Referring to FIG. 15, the contact opening principle of this device will be described below. Vacuum valve 1 for each open / close switch 14
Open / close switch 1 by simultaneously injecting the opening signals 21 and 22 of
Close both 4 and 15. When the open / close switch 14 is closed, a current flows from the DC power supply 13, and the trip coil 2
0 is excited. By this excitation, the trip bar 11 pops out to the right and hits the lower end of the lever 10. This causes the lever 10 to rotate counterclockwise about the fixing pin 10A, so that the left end of the lever 25 and the upper end of the lever 10 are disengaged. As a result, the tension spring 9 moves the lever 2
Since 5 is pulled downward from the pin 25A, the lever 25 also rotates counterclockwise, and the opening / closing shaft 8A also rotates counterclockwise. Along with that, the operating rod 7 lowers,
The conversion lever 6 rotates counterclockwise about the fixed pin 6A. As a result, the movable shaft 3A moves up, and the vacuum valve 1 opens.

On the other hand, when the open / close switch 15 is closed, the electric charge stored in the capacitor 16 flows out, 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 rod 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, since the electromagnetic coil 49 is fixed by the fixing frame 45 shown in FIG. 14, the short-circuit plate 40 hits the fastener 43 and pushes the insulating rod 5 upward.
When the vacuum valve 1 is opened, the repulsive force of the electromagnetic repulsion device 70 is added to the driving force from the operating portion 23, so that the opening time of the vacuum valve 1 becomes very 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 provided with the electromagnetic repulsion device 70 is particularly referred to as a high speed circuit breaker.

FIG. 16A is a side view of an essential part showing the configuration when the device of FIG. 14 is in a closed state, and FIG. 16B is a part A of FIG. 16A. It is an expanded side view. This FIG. 16 shows the carriage 47 and the fixed frame 45 of FIG.
It is a side view which looked at the upper part periphery of an operating mechanism except for.
The long hole 7A penetrates the upper part of the operation rod 7, the pin 7B is passed through the long hole 7A, and the pin 7B is also penetrated through both the conversion lever 6 and the roller 7C so that the conversion lever 6 and the operation rod 7 are connected to each other. It is connected via 7C. The wipe spring 27 is a compressible coil spring, and has a lower spring bearing 3
0 is fixed to the operating rod 7. On the other hand, the operating rod 7 penetrates the upper spring bearing 28 and guides the operating rod 7 in the axial direction. The wipe spring 27 interposed between the spring bearings 28 and 30 pushes up the roller 7C via the spring bearing 28 and constantly urges the conversion lever 6 to rotate clockwise. In addition, the wipe spring 27
Is for constantly applying pressure between the electrodes so as to maintain a good contact state between the fixed contact and the movable contact in the closed state of the vacuum valve.

FIG. 17A is a side view of an essential part showing the configuration when the device of FIG. 16 has completed contact opening, and FIG. 17B is an enlarged view of part B of FIG. 17A. It is a side view. Since the short circuit plate 40 is repelled upward by the operation of the electromagnetic repulsion device 70, the insulating rod 5 is driven upward. on the other hand,
Since the lever 8 also rotates counterclockwise around the opening / closing shaft 8A, the operation rod 7 is pulled downward. A force for rotating the conversion lever 6 counterclockwise is applied from both the insulating rod 5 side and the operating rod 7 side, and a vacuum valve (not shown) is opened at a high speed.

[0009]

However, the conventional high-speed circuit breaker as described above has a problem that the dielectric strength between the electrodes is once reduced after opening the vacuum valve. That is, at the time of vacuum valve opening operation, the electromagnetic repulsion device operates at high speed and the vacuum valve opens once.
When the electromagnetic energy injected into the electromagnetic repulsion device is exhausted, the wipe spring works to push back the vacuum valve in the direction to close it. This is because the electromagnetic repulsion device operates much faster than the operating unit. However, after that, the operating portion comes to work, so that the vacuum valve operates in the direction of opening the electrode again, and the completely opened state is maintained.

FIG. 18 (A) is a side view of the essential part showing the structure of the device of FIG. 17 once being pushed back in the closing direction, and FIG. 18 (B) is of FIG. 18 (A). It is a C part enlarged side view of. The electromagnetic energy injected into the electromagnetic repulsion device 70 disappears, and the force of the wipe spring 27 causes the conversion lever 6 to move.
Is pushed back to rotate clockwise. Figure 1
This is because the electromagnetic coil 49 is not excited when all the charges stored in the capacitor 16 of No. 5 are discharged, so that the short-circuit plate 40 returns downward and the wipe spring 27 comes into effect.

FIG. 19 shows that when the high-speed circuit breaker opens.
FIG. 6 is a characteristic diagram showing the relationship between the opening time and the gap between the poles.
It The horizontal axis is time, and the vertical axis is the opening gap between the vacuum valve poles.
Show. The characteristic line 51 (solid line) is the characteristic of the conventional device of FIG.
Is shown. Leftmost time t ₀When the opening command was issued in
Then time t₁With the electromagnetic repulsion device, the opening gap is zero.
Suddenly opens from. And time t₂And the opening gap
Is L₃Then, the contact state is once reached. But time
t₂The energy of the electromagnetic repulsion device will be consumed later
Then, the wipe spring comes into play, and the time t₃The separation gap shrinks to
See, L₁Becomes narrower. After that, the actuator will start to work
The separation gap opens again and the time t_FourAnd the separation gap is L₃When
And the opening operation is completed.

In FIG. 19, at time t ₃ , the opening gap is L
_Since it becomes as narrow as ₁ , the dielectric strength between the poles becomes the lowest at this point. If the minimum separation gap at the time of contact opening is as small as L ₁ , insulation between electrodes will be broken at the time of contact opening, and interruption will not be possible. Therefore, conventionally, the electromagnetic repulsion device could not be applied to a circuit breaker having a too high rated voltage. If the minimum opening gap L ₁ at the time of contact opening can be made larger, the electromagnetic repulsion device can be applied to circuit breakers having a higher rated voltage.

An object of the present invention is to increase the dielectric strength between the electrodes when the vacuum valve is opened.

[0014]

In order to achieve the above object, according to the present invention, 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. , The fixed contact and the movable contact are respectively joined to one end of the fixed shaft and the movable shaft in the vacuum container, and the other ends of the fixed shaft and the movable shaft are fixedly or movably outside the respective ends of the vacuum container. An operation unit that applies an opening / closing operation force to the vacuum valve via a link mechanism is connected to the other end of the movable shaft pulled out to the outside of the vacuum container, and a wipe spring and an electromagnetic repulsion device are provided in the middle of the link mechanism. The wiper spring constantly urges the fixed contactor and the movable contactor in the vacuum valve in a direction to close them, and the electromagnetic repulsion device is interposed between the wiper spring and the movable shaft of the vacuum valve. At the same time, it is equipped with a short-circuit plate that is electromagnetically repulsed by the excitation of the electromagnetic coil at the same time as the opening drive of the operating part, and the repulsive force of this short-circuit plate drives the link mechanism to the opening side of the vacuum valve In the circuit breaker, a speed reducer is interposed between the wiper spring and the movable shaft of the vacuum valve in the movable part of the link mechanism, and the speed reducer has an elastic part and a member for locking the elastic part. One of the elastic part and the locking part is fixed and the other is attached to the movable part of the link mechanism, and the elastic part becomes the locking part during the opening operation of the vacuum valve. It is better to be temporarily locked. As a result, after opening the vacuum valve, the electromagnetic energy injected into the electromagnetic repulsion device disappears and the vacuum valve is pushed back in the direction to close it once.However, at that time, the speed reducer works, so the elastic part temporarily stops at the locking part. The movement of the movable part of the link mechanism is delayed. For this reason, the operating portion starts to work before the separation gap between the electrodes becomes too narrow. As a result, the opening gap at the time of contact opening becomes larger than in the past, and the dielectric strength between the contacts at the time of contact opening becomes higher. The elastic part and the locking part are
One side may be fixed and the other side may be attached to the movable portion of the link mechanism, and either side of the elastic portion and the locking portion may be attached to the movable portion of the link mechanism.

In the high-speed circuit breaker having such a structure, the elastic portion of the speed reducer is a ball plunger that presses the sphere with a spring, and the locking portion is a recess or a protrusion that is temporarily locked to the sphere. You may do it. Since the sphere elastically moves by the spring, the ball plunger acts as an elastic portion. Moreover, the locking portion may be a concave portion or a convex portion. That is, if the locking part is a recess,
The sphere of the ball plunger fits into the recess and is temporarily locked. On the other hand, if the locking portion is a convex portion, the spherical body of the ball plunger is temporarily locked to the skirt of the convex portion after passing the convex portion.

In the high-speed circuit breaker having such a structure, the elastic portion of the reduction gear device is made of a leaf spring, and the locking portion is made of a concave portion or a convex portion temporarily locked at the end of the leaf spring. May be. If the leaf spring elastically moves and the locking portion is the recessed portion, the end portion of the leaf spring fits into the recessed portion and is temporarily locked. On the other hand, if the locking portion is a convex portion, the end portion of the leaf spring crosses the convex portion and then is temporarily locked to the skirt of the convex portion.

In the high speed circuit breaker having such a structure, a plurality of speed reducers may be provided at the same position of the link mechanism. This ensures that the elastic portion and the locking portion are locked. In the high-speed circuit breaker having such a configuration, the link mechanism may include a conversion lever that rotates about a fixed pin as a fulcrum, and the reduction gear may be provided in a reduction lever attached in the middle of the conversion lever. As a result, the deceleration lever also moves in synchronism with the conversion lever and becomes a movable part.

In the high-speed circuit breaker having such a structure, the link mechanism may include an insulating rod connected to the movable shaft of the vacuum valve, and the speed reducer may be provided in the insulating rod. Since the insulating rod is also configured in the conventional high speed circuit breaker, the number of parts for attaching one of the elastic portion and the locking portion of the reduction gear transmission can be reduced.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on embodiments. FIG. 1 is a side view of essential parts showing the configuration of a high speed circuit breaker according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrow G in FIG. A prismatic deceleration lever 55 is attached via a pin 54 penetrating the conversion lever 6. A guide 56 and a base 5 which will be described later are provided under the deceleration lever 55.
7 and a speed reducer 53 is provided. The other parts of FIG. 1 are the same as those of the conventional configuration of FIG. 16, and the same parts are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 3 is a sectional view taken along line DD of FIG. The guide 56 guides the deceleration lever 55 so that it can move up and down freely, and the guide 56 is formed in an L shape. The base 57 is fixed by passing the mounting bolt 62 (FIG. 1) through the guide 56 and the hole 57A (FIG. 3) of the base 57 and screwing it to the fixed frame 47. In FIG. 3, two ball plungers 61 serving as elastic portions are fitted in the base 57 so as to face each other. Ball plunger 6
1 is a container 60 having a compressible coil spring 59 and a sphere 58.
And are stored, and the container 60 is fixed to the base 57. Therefore, the sphere 58 is movable left and right, and the two ball plungers 61 constantly urge the deceleration lever 55 to be pressed. On the upper portion of the ball plunger 61, a recessed portion 63 serving as a locking portion is formed in the reduction lever 55. 1 to 3
Shows a configuration in which a vacuum valve (not shown) is closed.

FIG. 4 is a side view of the essential parts showing the structure of the apparatus of FIG. 1 once the contacts have been opened, and FIG.
It is an E sectional view. Deceleration lever 55 by conversion lever 6
Moves upwards, the sphere 5 of the ball plunger 61
8 once fits into the recess 63, but the electromagnetic repulsion device 70
By the force of, the sphere 58 comes out of the recess 63 and crawls to the upper portion of the deceleration lever 55, and the opening is once completed.

FIG. 6 is a side view of the essential parts showing the construction of the device of FIG. 4 once being pushed back in the closing direction, and FIG.
FIG. 7 is a sectional view taken along line FF of FIG. 6. When the energy of the electromagnetic repulsion device 70 is exhausted, the wipe spring 27 comes into effect and the deceleration lever 55 lowers, so that the sphere 58 and the recess 63 are fitted together as shown in FIG. Electromagnetic repulsion device 70
Since the sphere 58 fits into the recess 63 in a state where does not work, the deceleration lever 55 is fixed to the fixed frame 47 side,
Then it will not go down. Therefore, the separation gap between the electrodes of the vacuum valve is not narrower than in the past. Sphere 5
Since the operating portion (not shown) comes into effect after 8 is locked in the recess 63, the apparatus returns to the state shown in FIGS. 4 and 5, and the contact opening is completed.

Referring again to FIG. 19, the characteristic line 52 (one-dot chain)
The line) shows the characteristics of the embodiment of FIG. Leftmost time t
₀If the opening command is issued in, it is the same as the characteristic line 52.
Sea urchin time t₁With an electromagnetic repulsion device
It opens suddenly. And time t₂And the separation gap is L
₃Then, the contact state is once reached. But time t ₂
Afterwards the energy of the electromagnetic repulsion device is consumed and the wipe spring
Although it is returned to the original direction by 27,
Therefore, the time taken for the opening gap to shrink becomes slower and the time t₃Slower
Time T₃The actuator starts working. Therefore, open after that.
The separation gap opens, time t_FourAnd the separation gap is L₃Next to
The contact opening operation is completed. Time T₃The opening gap at is L₂Tona
But L₁Will not be narrower than. Minimum opening distance at opening
Gap L₁To L₂Since it can be increased,
The dielectric strength during operation can be increased and
It is possible to apply the electromagnetic repulsion device 70 to a circuit breaker with a high rating.
I can now.

FIG. 8 is a cross-sectional view of the essential parts showing the structure of a speed reducer for a high speed circuit breaker according to a different embodiment of the present invention. FIG. It is a figure in the case of being locked by a locking part. FIG. 8 shows the speed reducer 5 of FIG.
The only difference is that a speed reducer 64 is attached instead of No. 3. That is, in FIGS. 8A and 8B, the leaf spring 65 fixed to the base 57 as an elastic portion is attached instead of the ball plunger 61 of FIG. The operation mechanism is the same as that in the case of FIG. 1, and the reduction lever 55, which is once pushed back in the closing direction as shown in FIG. 8B, is temporarily held by fitting the recess 63 and the end of the leaf spring 65. Locked in. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases.

FIG. 9 is a sectional view of the essential parts showing the structure of a speed reducer for a high-speed circuit breaker according to a further different embodiment of the present invention. FIG. FIG. 6 is a view showing a case where is locked by a locking portion. 9 also differs only in that a reduction gear 66 is attached instead of the reduction gear 53 in FIG. That is, in FIGS. 8A and 8B, the convex portion 67 provided on the reduction lever 55 as a locking portion is shown in FIG.
It is attached instead of the recessed portion 63. The operation mechanism is the same as that in the case of FIG. 1, and the reduction lever 55 once pushed back in the closing direction as shown in FIG.
Is temporarily locked by the locking of the hem of the ball and the ball 58 of the ball plunger 61. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases.

FIG. 10 is a sectional view of the essential parts showing the structure of a speed reducer for a high-speed circuit breaker according to a still further embodiment of the present invention. (A) shows the case when the contact is closed, and (B) shows the elastic part. FIG. 6 is a view showing a case where is locked by a locking portion. 10 also differs only in that a reduction gear 68 is attached instead of the reduction gear 53 in FIG. That is, (A) and (B) of FIG.
Is a convex portion 67 provided on the deceleration lever 55 as a locking portion.
Is attached instead of the recessed portion 63 of FIG. On the other hand, a leaf spring 65 fixed to the base 57 as an elastic portion is attached instead of the ball plunger 61 of FIG. The operation mechanism is the same as in the case of FIG.
As shown in (B) of 0, the deceleration lever 55 that has been once pushed back in the closing direction is temporarily locked by the locking of the hem of the convex portion 67 and the end of the leaf spring 65. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases.

FIG. 11 is a sectional view of the essential parts showing the structure of a speed reducer for a high-speed circuit breaker according to a further different embodiment of the present invention. FIG. FIG. 6 is a view showing a case where is locked by a locking portion. FIG. 11 also differs only in that a speed reducer 69 is attached instead of the speed reducer 53 of FIG. That is, (A) and (B) of FIG.
The recessed portion 83 provided on the base 57 as a locking portion is attached instead of the recessed portion 63 on the reduction lever 55 side in FIG. On the other hand, leaf springs 85 fixed to the deceleration lever 55 as elastic portions are attached instead of the ball plungers 61 of FIG. 3, respectively. The operation mechanism is also the same as that of the case of FIG. 1, and the deceleration lever 55 once pushed back in the closing direction as shown in FIG. 11B is temporarily locked by the fitting of the recess 83 and the leaf spring 85. To be done. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases.

FIG. 12 is a sectional view of the essential parts showing the structure of a speed reducer for a high-speed circuit breaker according to a further different embodiment of the present invention. FIG. FIG. 6 is a view showing a case where is locked by a locking portion. FIG. 12 also differs only in that a reduction gear 71 is attached instead of the reduction gear 53 in FIG. That is, (A) and (B) of FIG.
3, a convex portion 87 provided as a locking portion on the base 57 is attached instead of the concave portion 63 on the reduction lever 55 side in FIG. On the other hand, the leaf springs 85 fixed to the deceleration lever 55 as elastic portions are respectively formed by the ball plungers 6 of FIG.
It is attached instead of 1. The operating mechanism is also Figure 1.
12B, the deceleration lever 55 once pushed back in the closing direction as shown in FIG. 12B is temporarily engaged by the engagement between the hem of the convex portion 87 and the end of the leaf spring 85. Be stopped. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases.

FIG. 13 is a cross-sectional view of the essential parts showing the structure of a speed reducer for a high speed circuit breaker according to a further different embodiment of the present invention. FIG. FIG. 6 is a view showing a case where is locked by a locking portion. FIG. 13 is different only in that a speed reducer 72 is attached instead of the speed reducer 66 of FIG. That is, (A) and (B) of FIG.
A cylindrical plunger 73 as an elastic portion is attached instead of the ball plunger 61 of FIG. The cylindrical plunger 73 is obtained by replacing the spherical body 58 of the ball plunger 61 of FIG. 9 with the cylindrical body 74. The operation mechanism is the same as that in the case of FIG. 1, and the reduction lever 55 once pushed back in the closing direction as shown in FIG. 13B causes the skirt of the convex portion 67 and the cylindrical body 74 of the cylindrical plunger 73 to move. It is temporarily locked by locking. As a result, the minimum opening gap at the time of contact opening becomes larger than the conventional one, and the dielectric strength at the time of contact opening operation increases. What is pressed by the coil spring 59 is the same whether it is the spherical body 58 or the cylindrical body 74. The tip of the elastic portion may have any shape as long as it is rounded so as to be in contact with the reduction lever 55, and is not necessarily the spherical body 58 or the cylindrical body 74.

Generally, the speed reducer may be composed of an elastic portion and a locking portion. Therefore, as described above, the elastic portion and the locking portion may be fixed to the base 57 side or the reduction lever 55 side. Further, the elastic portion may be elastic, and in the case of FIG. 13, for example, the entire elastic portion may be a rubber body having the same outer shape as the cylindrical plunger 73. Further, the shape of the locking portion may be a convex portion or a concave portion. Furthermore, the convex portion and the concave portion may have a circular shape or a conical shape. Further, a plurality of elastic portions and locking portions in the reduction gear transmission may be provided at the same position. For example, in the case of FIG.
Four cylinder plungers 73 may be attached and the deceleration lever 55 may be pressed from four directions. Thereby, the elastic portion and the locking portion can be reliably and temporarily locked.

Further, in FIG. 1, the deceleration lever 55 is
It may be provided in the middle of the conversion lever 6 on the right side of the fixed pin 6A. In that case, since the movement of the deceleration lever 55 is in the opposite direction of FIG. 1, the deceleration device 53 is attached to the upper end of the deceleration lever 55.
Is attached in the opposite direction to that of FIG. However, the operation mechanism is the same as in the case of FIG. Further, in FIG. 1, a speed reducer may be provided in the middle of the insulating rod 5. Since the insulating rod 5 also moves up and down in synchronization with the deceleration lever 55, for example, in FIG.
An insulating rod 5 may be used instead of 55. However, since the insulating rod 5 in FIG. 1 also moves in the opposite direction to the deceleration lever 55, it is necessary to configure the deceleration device 53 in the opposite direction to that in FIG. Since the insulating rod 5 is also configured as a conventional high-speed circuit breaker, it is not necessary to add a deceleration lever 55 to attach the reduction gear 53, and the number of parts can be reduced.

[0032]

As described above, according to the present invention, of the movable parts of the link mechanism, the speed reducer is interposed between the wipe spring and the movable shaft of the vacuum valve, and the speed reducer includes the elastic part and the elastic part.
This elastic part is configured to be locked, and one of the elastic part and the locking part is fixed, and the other is attached to the movable part of the link mechanism. Since the elastic part was temporarily locked to the locking part with, the dielectric strength between the electrodes when opening was higher than before,
The electromagnetic repulsion device can be applied to circuit breakers with higher rated voltage.

In the high speed circuit breaker having such a structure, the reliability is improved by providing a plurality of reduction gears at the same position of the link mechanism. In the high-speed circuit breaker having such a configuration, the link mechanism includes an insulating rod connected to the movable shaft of the vacuum valve, and the speed reducer is provided in the middle of the insulating rod, thereby reducing the number of parts of the speed reducer. It was possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing the configuration of a high-speed circuit breaker according to an embodiment of the present invention.

FIG. 2 is a view on arrow G in FIG.

FIG. 3 is a sectional view taken along the line DD of FIG.

FIG. 4 is a side view of essential parts showing the configuration of the device of FIG. 1 once the contact opening is completed.

5 is a sectional view taken along line EE of FIG.

6 is a side view of essential parts showing the configuration of the device of FIG. 4 once being pushed back in the closing direction.

7 is a sectional view taken along line FF of FIG.

FIG. 8 is a cross-sectional view of an essential part showing the structure of a speed reducer for a high-speed circuit breaker according to another embodiment of the present invention, in which (A) is a closed state and (B) is an elastic part and a locking part. Figure when locked to

FIG. 9 is a cross-sectional view of essential parts showing a configuration of a speed reducer for a high-speed circuit breaker according to still another embodiment of the present invention,
(A) shows the case when the contact is closed, and (B) shows the case where the elastic part is locked by the locking part.

FIG. 10 is a cross-sectional view of essential parts showing the configuration of a speed reducer for a high-speed circuit breaker according to still another embodiment of the present invention,
(A) shows the case when the contact is closed, and (B) shows the case where the elastic part is locked by the locking part.

FIG. 11 is a cross-sectional view of essential parts showing the configuration of a speed reducer for a high-speed circuit breaker according to still another embodiment of the present invention,
(A) shows the case when the contact is closed, and (B) shows the case where the elastic part is locked by the locking part.

FIG. 12 is a cross-sectional view of essential parts showing a configuration of a speed reducer for a high-speed circuit breaker according to still another embodiment of the present invention,
(A) shows the case when the contact is closed, and (B) shows the case where the elastic part is locked by the locking part.

FIG. 13 is a cross-sectional view of essential parts showing the configuration of a speed reducer for a high-speed circuit breaker according to still another embodiment of the present invention,
(A) shows the case when the contact is closed, and (B) shows the case where the elastic part is locked by the locking part.

FIG. 14 is a side view showing the configuration of a conventional high speed circuit breaker.

FIG. 15 is a principle diagram illustrating an opening mechanism of the high speed circuit breaker of FIG.

16 (A) is a side view of a main part showing a configuration when the device of FIG. 14 is in a closed state, and FIG. 16 (B) is an enlarged side view of part A of FIG. 16 (A).

FIG. 17 (A) is a side view of essential parts showing the configuration when the device of FIG. 16 has completed opening, and FIG. 17 (B) is an enlarged side view of part B of FIG. 17 (A).

FIG. 18 (A) is a side view of essential parts showing the configuration of the device of FIG. 17 once being pushed back in the closing direction;
Is an enlarged side view of part C of FIG.

FIG. 19 is a characteristic diagram showing the relationship between the time when the high-speed circuit breaker performs an opening operation and the opening gap between the electrodes.

[Explanation of symbols]

1: vacuum valve, 3A: movable shaft, 3B: fixed shaft, 4: link mechanism, 5: insulating rod, 6: conversion lever, 6A: fixed pin, 23: operating part, 27: wipe spring, 53, 6
4, 66, 68, 69, 71, 72: speed reducer, 55:
Deceleration lever, 61: Ball plunger (elastic part), 6
5, 85: leaf spring (elastic portion), 67, 87: convex portion (locking portion), 63, 83: recessed portion (locking portion), 70: electromagnetic repulsion device

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Konno 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (56) Reference JP-A-7-114862 (JP, A) Flat 1-239719 (JP, A) JP-A-55-27531 (JP, A) JP-A-56-67127 (JP, A) Actually open 56-51235 (JP, U) Actually open 2-31040 (JP , U) Actual Kaihei 5-38744 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 33/66 H01H 33/42

Claims (6)

(57) [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 operating portion for applying an opening / closing operation force to the vacuum valve is connected via a link mechanism, and a wipe spring and an electromagnetic repulsion device are interposed in the middle of the link mechanism, and the wipe spring makes a movable contact with a fixed contact in the vacuum valve. Always energize in the direction to close the child,
The electromagnetic repulsion device is installed between the wipe spring and the movable shaft of the vacuum valve, and is equipped with a short-circuit plate that is electromagnetically repulsed by the excitation of the electromagnetic coil at the same time as the opening drive of the operating part. In a high-speed circuit breaker configured to drive a link mechanism to an opening side of a vacuum valve, a reduction gear is interposed between a wipe spring and the movable shaft of the vacuum valve in a movable part of the link mechanism. The reduction gear device is composed of an elastic portion and a locking portion that locks the elastic portion. Either one of the elastic portion and the locking portion is fixed, and the other is attached to the movable portion of the link mechanism. The high-speed circuit breaker is characterized in that the elastic portion is temporarily locked to the locking portion during the opening operation of the vacuum valve. 2. The high speed circuit breaker according to claim 1, wherein
A high-speed circuit breaker characterized in that the elastic portion of the reduction gear device is a ball plunger that presses a sphere with a spring, and the locking portion is a recess or a projection that is temporarily locked to the sphere. 3. The high speed circuit breaker according to claim 1, wherein
A high-speed circuit breaker, characterized in that the elastic portion of the speed reducer is made of a leaf spring, and the locking portion is made of a concave portion or a convex portion that is temporarily locked to the end portion of the leaf spring. 4. The high speed circuit breaker according to claim 1, wherein a plurality of reduction gears are provided at the same position of the link mechanism. 5. The high-speed circuit breaker according to claim 1, wherein the link mechanism includes a conversion lever that rotates about a fixed pin as a fulcrum, and a reduction gear installed in the middle of the conversion lever. A high-speed circuit breaker, wherein the speed reducer is provided on a lever. 6. The high-speed circuit breaker according to claim 1, wherein the link mechanism includes an insulating rod connected to a movable shaft of a vacuum valve, and the speed reducer is provided in the insulating rod. A high-speed circuit breaker characterized by being provided.