JPH0594739A - Resistance breaking part - Google Patents

Abstract

PURPOSE:To provide a resistance breaking part which has a large electric current breaking capacity and in which a distance between electrodes is small and by which opening speed of a movable electrode is small. CONSTITUTION:The tip part of a movable electrode 21 fixed to an operation rod 7 and the tip part of a fixed electrode 22 to contact with/separate from the movable electrode 21, are formed in a spherical surface shape having prescribed curvature. A stopper 27 is formed protrusively on the outer peripheral side in a base of the fixed electrode 22. In a hollow cylindrical guide 24 having a stopper 26 on its tip so as to regulate movement of the fixed electrode 22, this fixed electrode 22 is installed slidably through a spring 25. The spring 25 is used to energize the fixed electrode 22 toward the movable electrode 21 side. In a closed condition of a resistance breaking unit, the movable electrode 21 and the fixed electrode 22 are constituted so as to be brought into contact with each other in a mutually butted condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker, and more particularly to a resistance breaker connected in series with a resistance.

[0002]

2. Description of the Related Art As a circuit breaker in a power system, a circuit breaker of a resistance breaking system is known. The purpose of this method is to suppress the transient overvoltage at the time of interruption, suppress the transient recovery voltage, and the like. The operating principle of the resistance interruption method is shown in FIG. In FIG. 3, 1 is a main breaker, 2 is a resistance breaker, 3 is a resistor, and 4 is a current. Also,
3A to 3C show a closed state, a contact opening state, and an open state, respectively.

First, in the closed state of FIG. 3 (A),
The current 4 is flowing through the main breaker 1. Next, FIG.
As shown in (B), the main breaker 1 is opened to open the main breaker 1
When the current of 1 is cut off, the current flows through the resistor 3 and the resistance cutoff portion 2. Subsequently, as shown in FIG. 3 (C), the resistance breaking unit 2 is opened to cut off the current of the resistance breaking unit 2 and the open circuit state is established.

FIG. 4 is an explanatory view of a conventional puffer type resistance breaker. In FIG. 4, 5 is a movable electrode, 6
Is a fixed electrode, 7 is an operating rod, 8 is a cylinder, 9 is a piston, 10 is a puffer chamber, 11 is an insulating nozzle, 12 is an arc extinguishing gas, 13 is an arc, 14 is a compressed gas flow path, 15
Is the tip of the movable electrode 5, and 16 is the tip of the fixed electrode 6.

When the current is cut off in such a resistance breaking portion, the operating rod 7 is driven rightward in the drawing by a driving device (not shown) in FIG. 4 (A) showing the closing state. Since the operating rod 7, the movable electrode 5, the cylinder 8 and the insulating nozzle 11 are integrally formed, the movable electrode 5 also moves to the right in the figure as the operating rod 7 moves. In this way, the fixed electrode 6 and the movable electrode 5 are
When and are separated, an arc 13 is generated between both electrodes as shown in FIG. 4 (B).

At the same time, the arc-extinguishing gas in the puffer chamber 10 composed of the cylinder 8 and the piston 9 is compressed, and the compressed gas in the puffer chamber 10 is blown to the arc 13 through the gas passage 14. A large arc extinguishing capability is obtained by this spraying, and the arc is extinguished at the current zero point of the arc current 13. It should be noted that FIG. 4C shows an open state after the arc is extinguished.

[0007]

However, the conventional resistance breaking section having the above-mentioned structure has the following problems to be solved. That is, in the above resistance breaker, the speed and magnitude of insulation recovery between the electrodes after arc extinction increases as the electric field distribution between the electrodes becomes more uniform. The electric field distribution between the electrodes is determined mainly by the shapes of the tip of the fixed electrode 6 and the tip of the movable electrode 5. For example, in the conventional puffer type blocking section shown in FIG. 4, the tip of the fixed electrode 6 is rod-shaped and is housed inside the movable electrode 5 in the closed state. However, there is a limit to equalizing the electric field distribution between the electrodes.

Therefore, if the conventional puffer method shown in FIG. 4 is adopted as the resistance cutoff section of the resistance cutoff method shown in FIG. It was necessary to increase the distance to increase the opening speed of the movable electrode.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and its object is to open a movable electrode having a large current interruption capability and a small distance between electrodes. It is to provide a resistance breaking unit having a low speed.

[0010]

According to the present invention, in a container filled with an arc-extinguishing gas, a pair of electrodes that can be brought into contact with and separated from each other, and an insulating nozzle arranged so as to surround a contact portion of both electrodes,
A puffer chamber that compresses gas in conjunction with the opening operation of the electrodes, and a tip of both electrodes in a resistance cutoff part of a resistance cutoff system in which gas from the puffer chamber is blown between the electrodes. Is formed into a spherical surface having a predetermined curvature, and both electrodes are in contact with each other in an abutting state when the resistance cutoff portion is closed.

[0011]

According to the resistance cutoff portion of the present invention, the tip end portions of the movable electrode and the fixed electrode are configured to have a small curvature.
The electric field distribution between the electrodes can be equalized, and the speed and magnitude of insulation recovery between the electrodes can be increased. Further, since the insulation recovery speed between the electrodes is increased, the distance between the electrodes can be reduced, and further, the opening drive speed of the movable electrode can be decreased.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. The same members as those of the conventional type shown in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIG.
The tip of the movable electrode 21 fixed to the tip of the operation rod 7 is formed in a spherical shape having a predetermined curvature. On the other hand, the fixed electrode 22 that comes into contact with and separates from the movable electrode 21 is also formed in a spherical shape having a predetermined curvature at its tip.

Further, a stopper 27 is formed at the base of the fixed electrode 22 so as to project to the outer peripheral side. The fixed electrode 22 is slidably mounted via a spring 25 in a hollow cylindrical guide 24 having a stopper 26 for restricting the movement of the fixed electrode 22 at its tip. In addition, the spring 25 connects the fixed electrode 22 to the movable electrode 21.
It urges to the side.

The movable electrode 21 and the fixed electrode 22 are arranged so as to be in contact with each other in an abutting state when the resistance cutoff portion is closed.

The resistance cutoff portion of the present embodiment having such a structure operates as follows. That is, when the current is cut off from the closed state of the resistance breaking portion shown in FIG. 1, the operating rod 7 is driven rightward in the drawing by a driving device (not shown). Here, since the operating rod 7, the movable electrode 21, the cylinder 8 and the insulating nozzle 11 are integrally formed, the movable electrode 21 moves rightward in the drawing together with the operating rod 7.

In this way, the movable electrode 21 and the fixed electrode 22 are
When and are separated, an arc 13 is generated between both electrodes as shown in FIG. At this time, at the same time, the arc-extinguishing gas in the puffer chamber 10 composed of the cylinder 8 and the piston 9 is compressed and blown to the arc 13 through the flow path 14. This spray gives a great arc extinguishing ability,
The arc is extinguished at the current zero point of the arc current 13. After extinguishing the arc, a voltage is applied between the movable electrode 21 and the fixed electrode 22.

As described above, in this embodiment, since the movable electrode 21 and the fixed electrode 22 are in contact with each other in an abutting state when the resistance breaking portion is closed, the tip of the movable electrode 21 is in contact with each other. The curvature of the tip of the fixed electrode 22 can be made smaller than that of the conventional puffer-shaped blocking portion. As a result, the electric field distribution between the poles becomes more uniform, so that the speed and magnitude of insulation recovery between the poles can be further increased. As a result, the distance between the electrodes can be made smaller, and even if the driving speed of the movable electrode 21 is made smaller, it is possible to withstand the inter-electrode voltage after arc extinction.

[0019]

As described above, according to the present invention, the tip portions of the movable electrode and the fixed electrode are formed into a spherical surface having a predetermined curvature, and both electrodes are formed in the closed state of the resistance interruption portion. By constructing them so as to be in contact with each other in abutting state, it is possible to provide a resistance interruption part having a large current interruption ability, a small distance between the electrodes, and a small opening speed of the movable electrode.

[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 an open state of the embodiment shown in FIG. 1, and FIG. 2B is a cross-sectional view showing an open circuit state.

FIG. 3 is a diagram showing an operating principle of a resistance cutoff method,
(A) is a closed state, (B) is an opening state, (C) is an open state

FIG. 4A is a cross-sectional view showing a closed state of a conventional puffer type resistance breaker, FIG. 4B is a cross-sectional view showing a state in which a contact is being opened, and FIG. 4C is a cross-sectional view showing an open circuit state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main interruption | blocking part 2 ... Resistance interruption | blocking part 3 ... Resistance 4 ... Current 5 ... Movable electrode 6 ... Fixed electrode 7 ... Operation rod 8 ... Cylinder 9 ... Piston 10 ... Puffer chamber 13 ... Arc 21 ... Movable electrode 22 ... Fixed electrode 23 ... Fixed side support member 24 ... Guide 25 ... Spring 26 ... Stopper 27 ... Stopper

Front page continued (72) Inventor Hiroaki Toda 2-1, Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki factory

Claims (1)

[Claims] 1. A container filled with an arc-extinguishing gas,
A pair of electrodes that can be contacted and separated, an insulating nozzle that is arranged so as to surround the contact portions of both electrodes, and a puffer chamber that compresses gas in conjunction with the opening operation of the electrodes are provided. In the resistance cutoff part of the resistance cutoff system in which gas is blown between the electrodes, the tip parts of the both electrodes are formed into a spherical surface having a predetermined curvature, and when the resistance cutoff part is turned on, both electrodes are A resistance breaking unit, characterized in that they are configured to contact each other in a butt state.