JPH0636658A - Resistance breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To secure an excellent current interruption capability, and to reduce the distance between the movable electrode and the fixed electrode and the opening drive speed of the movable electrode. According to an embodiment of the present invention, in a resistance cutoff portion, tip ends of a movable electrode 21 and a fixed electrode 22 are formed in a spherical shape having a predetermined locality, and a peripheral portion on the movable electrode 21 passes through the inside of the movable electrode 21 to provide a buffer. A gas blowing hole 29 communicating with the chamber 10 is formed, and when both electrodes 21 and 22 perform a charging operation, both electrodes 2
The tips of the first and second parts 22 are in contact with each other in a butted state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type resistance breaking unit used in a resistance breaking type gas circuit breaker, and more particularly to a resistance breaking unit having an improved shape of a movable electrode and a fixed electrode. is there.

[0002]

2. Description of the Related Art Generally, in a gas circuit breaker in an electric power system, a transient overvoltage is generated during a breaking operation,
It is known that a transient recovery voltage is generated after the breaking operation. Therefore, a resistance breaking type gas circuit breaker has been proposed for the purpose of suppressing such transient overvoltage and transient recovery voltage.

The operating principle of this resistance interruption method is shown in FIG.
This will be described with reference to (C). (A) is a closed state,
(B) shows an open state, and (C) shows an open circuit. The resistance interruption type gas circuit breaker includes a main interruption unit 1, a resistance interruption unit 2, and a resistor 3. The main breaking unit 1 is connected in parallel with the resistance breaking unit 2 and the resistor 3. Further, the resistance breaking unit 2 is connected in series with the resistance 3. In the figure, 4 is a current.

In such a resistance breaking type gas circuit breaker, the current 4 flows through the main breaking portion 1 in the closed state of FIG. 4 (A). Next, when the main breaking part 1 is opened in the middle of the opening of FIG. 4B, the current 4 flowing in the main breaking part 1
Will flow through the resistor 3 and the resistance breaker 2.
Subsequently, in the open circuit state of FIG. 4C, the resistance cutoff portion 2 opens to cut off the current 4.

A puffer type resistance breaker has been conventionally used as the resistance breaker of the above-described gas circuit breaker. Regarding this puffer type resistance breaker, FIG. 5 (A)
It demonstrates concretely with reference to (C). (A) shows a closed state, (B) shows an opening state, and (C) shows an open circuit.
The resistance breaking portion is housed in a container (not shown) filled with the arc extinguishing gas 12. In this container, a pair of electrodes including a movable electrode 5 and a fixed electrode 6 is provided.

The fixed electrode 6 is fixed to the container side, and the movable electrode 5 is movable in the horizontal direction in the figure.
Both electrodes 5 and 6 are adapted to perform a closing operation and a separating operation when the respective tip portions 15 and 16 contact and separate from each other. The tip 15 on the movable electrode 5 side is formed in a hollow cylindrical shape, and the tip 16 on the fixed electrode side is formed in a rod shape.

An operating rod 7 is fixed to the movable electrode 5. The operation rod 7 is provided so as to be movable in the left-right direction in the drawing. A drive device (not shown) is connected to the operation rod 7. The movable electrode 5 and the operating rod 7 are configured to integrally move in the left-right direction in the figure by receiving the driving force of this driving device.

The operating rod 7 has a hollow cylindrical cylinder 8
Is attached. Arc extinguishing gas 1 in cylinder 8
2 is filled and a piston 9 is slidably provided. A puffer chamber 10 is composed of the cylinder 8 and the piston 9. An insulating nozzle 11 is provided at the tip of the puffer chamber 10. This insulating nozzle 11
A predetermined gap is formed between the puffer chamber 10 and the puffer chamber 10, and the gas passage 14 is formed from this gap. The insulating nozzle 11 and the puffer chamber 10 are communicated with each other via the gas flow path 14. Further, the insulating nozzle 11 is arranged so as to surround the tip portions of the movable electrode 5 and the fixed electrode 6 which are in contact with each other.

In the resistance breaker having such a structure, when the current is cut off, it operates as follows. Figure 5
In the closed state shown in (A), the tip portion 15 of the movable electrode 5 is
The tip portion 16 of the fixed electrode 6 is inserted therein. The piston 9 is located on the right side in the figure.

From this state, when the operating rod 7 is moved rightward in the drawing by a driving device (not shown), the operating rod 7
The movable electrode 5 also starts to move to the right in the figure integrally with.
As a result, the fixed electrode 6 and the movable electrode 5 perform the separating operation. At this time, an arc 13 is generated between the electrodes 5 and 6 as shown in FIG.

Simultaneously with the above separating operation, the piston 9 moves leftward in the figure to compress the arc-extinguishing gas 12 in the cylinder 8. Then, the arc-extinguishing gas 12 compressed in the puffer chamber 10 is sent to the gas passage 14. The arc extinguishing gas 12 reaches the insulating nozzle 11 through the gas flow path 14. The insulating nozzle 11 blows the arc-extinguishing gas 12 onto the arc 13 generated between the electrodes 5 and 6. By this spraying, the arc 13 is extinguished at the current zero point. Finally, both electrodes 5 and 6 are in the open circuit state shown in FIG. As described above, the puffer type resistance breaking portion can obtain a large arc extinguishing ability by spraying the arc extinguishing gas 12 compressed from the puffer chamber 10 onto the arc 13, and can exhibit an excellent current interrupting ability. .

[0012]

By the way, in order to ensure the excellent current breaking capability of the resistance breaking portion, the speed and magnitude of the insulation recovery between the electrodes after the arc is extinguished must be large. It is known that the speed and magnitude of the insulation recovery between the electrodes increase as the electric field distribution between the electrodes increases. The electric field distribution between the electrodes mainly depends on the shapes of the tips of both electrodes. For example, in the puffer type resistance breaker shown in FIG. 5, the tip of the fixed electrode 6 is rod-shaped, and the tip 16 of the fixed electrode 6 is the tip of the movable electrode 5 when the electrodes 5 and 6 are turned on. It is inserted in 5. Therefore, there is a limit in equalizing the electric field distribution between the electrodes 5 and 6. Therefore, in the resistance cutoff portion shown in FIG. 5, in order to secure the necessary speed and magnitude of insulation recovery, the distance between the electrodes 5 and 6 is increased and the opening drive speed of the movable electrode 5 is increased. I had to do it.

As described above, the conventional resistance breaking section has a problem that the distance between the movable electrode and the fixed electrode and the opening drive speed of the movable electrode are high. In the conventional technology having such a problem, there is a possibility that problems such as an increase in the size of the resistance breaking portion and a cost increase due to an increase in driving force may occur.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object of the present invention is to ensure an excellent current cutoff capability, and also to provide a movable electrode and a fixed electrode. Another object of the present invention is to provide a resistance breaking unit that reduces the distance between them and the opening driving speed of the movable electrode.

[0015]

In order to achieve the above-mentioned object, the resistance breaking portion of the present invention forms the tip of the movable electrode and the fixed electrode in a spherical shape having a predetermined curvature, and surrounds the movable electrode. A gas injection hole that communicates with the puffer chamber through the inside of the movable electrode is formed in the part, and when both electrodes take the closing operation,
It is characterized in that the tip portions of both electrodes are configured to come into contact with each other in a butted state.

[0016]

In the present invention having the above-described structure, when the movable electrode and the fixed electrode perform the closing operation, the tip ends of the spherical movable electrode and the fixed electrode come into contact with each other in a butted state. Therefore, the curvature of both can be reduced,
It is possible to equalize the electric field distribution between the electrodes. Therefore, the speed and size of the insulation recovery between the electrodes can be increased.

Moreover, since the insulation recovery speed between the electrodes is increased, the distance between the electrodes can be reduced. Further, the opening drive speed of the movable electrode may be small. Further, since the gas blowing hole communicating with the puffer chamber is provided on the peripheral portion on the movable electrode, it is not necessary to provide a gap serving as a gas flow passage between the movable electrode and the insulating nozzle as a gas flow passage. It is possible to reduce the diameter.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the resistance breaking unit according to the present invention will be specifically described below with reference to FIGS. 1 and 2A and 2B. FIG. 1 shows a closed state, FIG. 2 (A) shows a contact opening state of the embodiment shown in FIG. 1, and FIG. 2 (B) shows an open circuit state.
The same members as those of the conventional type shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, a pair of electrodes consisting of a movable electrode 21 and a fixed electrode 22 is provided in the container filled with the arc extinguishing gas 12. The movable electrode 21 is fixed to the tip of the operation rod 7, and the fixed electrode 22 is provided on the wall surface 23 of the container. Both electrodes 21 and 22 are adapted to perform a closing operation and an opening operation by contacting and separating the respective tip portions. The tips of both electrodes 21, 22 are formed in a spherical shape having a predetermined curvature. And both electrodes 2
When the electrodes 1 and 22 perform the closing operation, the electrodes 21 and 22 are in contact with each other in a butted state.

A vent hole 28 is provided between the movable electrode 21 and the puffer chamber 10. Furthermore, the movable electrode 21
A hollow gas channel 30 is formed inside. Vent hole 2
The compressed arc-extinguishing gas 12 sent out from the puffer chamber 10 passes through the gas passage 8 and the gas passage 30. Further, a gas blowing hole 29 is opened in the peripheral portion on the tip of the movable electrode 21. This gas blowing hole 29
Is communicated with the puffer chamber 10 through the ventilation hole 28 and the gas flow path 30.

A hollow cylindrical guide 24 is fixed to the wall surface 23 of the container. The fixed electrode 22 is slidably mounted in the guide 24. A spring 25 is housed in the guide 24. The spring 25 biases the fixed electrode 22 toward the movable electrode 21 side. Also, guide 2
A stopper 26 projecting inward is formed at the tip of No. 4. On the other hand, a stopper 27 protruding outward is formed at the base of the fixed electrode 22. The fixed electrode 22 biased by the spring 25 is restricted from moving toward the movable electrode 21 by the stopper 27 contacting the stopper 26.

When the resistance breaking section of the present embodiment having such a structure cuts off the current, it operates as follows. When the operating rod 7 moves to the right in the drawing by the driving device (not shown) from the loading state shown in FIG. 1, the movable electrode 21 starts moving to the right in the drawing integrally with the operating rod 7.

In this way, the movable electrode 21 and the fixed electrode 22
When and are separated, the gap between the electrodes 21 and 22 is as shown in FIG.
As shown in (A), an arc 13 is generated. Simultaneously with this opening / closing operation, the piston 9 moves leftward in the figure, and the arc extinguishing gas 12 in the cylinder 8 is compressed. Then, the arc extinguishing gas 12 compressed in the puffer chamber 10 is sent to the ventilation hole 28. The compressed arc-extinguishing gas 12 becomes a gas flow 31 and passes through the vent hole 28. Further, the arc-extinguishing gas 12 is the gas flow 3
2 and passes through the gas passage 30 and the gas blowing hole 29. Then, the gas blowing hole 29 is provided with the arc extinguishing gas 1
2 is sprayed onto the arc 13 generated between the electrodes 5 and 6. By this spraying, the arc 13 is extinguished at the current zero point. Finally, the open circuit state shown in FIG. 2B is obtained.

According to the present embodiment as described above, when the movable electrode 21 and the fixed electrode 22 perform the closing operation, the tip ends of the spherical electrodes 21 and 22 come into contact with each other in an abutting state. The curvature can be reduced. Therefore, it becomes possible to equalize the electric field distribution between the electrodes 21 and 22. Therefore, the speed and magnitude of insulation recovery between the electrodes 21 and 22 can be increased, and an excellent current interruption capability can be secured.

Further, since the insulation recovery speed between the electrodes 21 and 22 is increased, the distance between the electrodes 21 and 22 and the opening driving speed of the movable electrode 21 can be reduced. Moreover, since the gas blowing holes 29 communicating with the puffer chamber 10 are provided in the peripheral portion on the movable electrode 21, it is necessary to provide a gap serving as a gas passage between the movable electrode 21 and the insulating nozzle 11 as a gas passage. Instead, the diameter of the puffer chamber 10 can be reduced.

The resistance breaking portion of the present invention is not limited to the above-mentioned embodiment, but includes the embodiment shown in FIG. In this embodiment, the gas passage 33 inside the movable electrode 21 has a streamlined shape that connects the ventilation hole 28 and the gas blowing hole 29. According to such a gas flow path 33, since the compressed gas from the puffer chamber 10 flows with little turbulence, the arc can be extinguished efficiently.

[0027]

As described above, according to the resistance cutoff portion of the present invention, the tip ends of the movable electrode and the fixed electrode are formed into a spherical surface having a predetermined curvature, and the movable electrode and the fixed electrode perform the closing operation. At the time of taking, by configuring both electrodes to contact each other in abutting state, it is possible to equalize the electric field distribution between the electrodes and increase the speed and magnitude of insulation recovery between the electrodes, resulting in excellent current interruption. It was possible to secure the capability, reduce the distance between the electrodes, and reduce the opening drive speed of the movable electrode.

Further, in the resistance cutoff portion of the present invention, since the gas blowing hole communicating with the puffer chamber through the inside of the movable electrode is formed in the peripheral portion on the movable electrode, the gas flow path is provided outside the movable electrode. It was possible to reduce the diameter of the puffer chamber.

[Brief description of drawings]

FIG. 1 is a sectional view showing a closed state of an embodiment of a resistance breaking unit of the present invention.

2A is a cross-sectional view showing a state in which the contacts are open in the embodiment shown in FIG. 1, and FIG. 2B is a cross-sectional view showing an open circuit state.

FIG. 3 is a cross-sectional view showing another embodiment of the resistance breaker of the present invention in the middle of contact opening.

FIG. 4 is a diagram showing an operating principle of a resistance cutoff method,
(A) is a closed state, (B) is a state in the middle of opening, (C) is an open state

5A is a cross-sectional view showing a closed state of a conventional puffer type resistance breaker, FIG. 5B is a cross-sectional view showing a halfway state of opening, and FIG. 5C is a cross-sectional view showing an open circuit state.

[Explanation of symbols]

 7 Operation Rod 8 Cylinder 9 Piston 10 Puffer Chamber 11 Insulation Nozzle 12 Arc-Extinguishing Gas 21 Movable Electrode 22 Fixed Electrode 28 Vent Hole 29 Gas Blow Hole 30, 33 Gas Flow Path 31, 32 Gas Flow

Claims (1)

[Claims] 1. A pair of electrodes consisting of a movable electrode and a fixed electrode are provided in a container filled with an arc-extinguishing gas, and both electrodes are configured to be contactable and separable so as to perform a separating operation and a closing operation, and further contacted. An insulating nozzle is arranged so as to surround the tips of both electrodes, and a puffer chamber that compresses the arc-extinguishing gas in conjunction with the opening operation of the electrodes is provided. In a resistance cutoff part of a resistance cutoff method in which an arc gas is blown between the electrodes, the tip ends of the electrodes are formed into a spherical surface having a predetermined curvature, and a movable electrode is provided in a peripheral part on the movable electrode. A resistance cutoff, characterized in that a gas blowing hole communicating with the puffer chamber through the inside is formed, and the tip portions of both electrodes are in contact with each other in a butt state when the both electrodes perform a closing operation. Department.