JPH07176244A - Gas puffer circuit breaker - Google Patents

Abstract

PURPOSE:To improve arc resistance of a nozzle by constituting the nozzle of insulating material of fluororesin which is heated to its melting point or higher and irradiated with an electron beam. CONSTITUTION:A nozzle 1 is provided in a vessel sealed with SF6 gas, to inject SF6 gas against an arc 3 generated between fixed and movable electrodes. This nozzle 1 is formed of an insulating material constituted of fluororesin which is heated at a melting point or higher and irradiated with an electron beam. In the periphery of this nozzle 1, peripheral gas space 2, sealed with SF6 gas, is provided. In the arc 3, an energy beam 4 is incident upon toward the nozzle 1. By this constitution, even when the energy beam is incident upon in the nozzle 1, since energy beam resistance is larger about 5 times as compared with a fluororesin-made nozzle, a crack and carbonization of the nozzle 1 can be prevented, so that wearing of the nozzle 1 can be suppressed down to a minimum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker used in a substation or a switching station of a power system.

[0002]

2. Description of the Related Art Generally, a gas circuit breaker is used in a power plant or substation installed in a power system. This gas circuit breaker is provided with a fixed electrode part and a movable electrode part that can be contacted and separated from each other in a container filled with an arc extinguishing gas such as SF ₆ gas, and the current is generated by separating the movable electrode part from the fixed electrode part. The shutoff operation is performed. Then, when the gas circuit breaker performs the current interruption operation, an arc is generated between the fixed electrode part and the movable electrode part.Therefore, in order to extinguish the arc, an arc-extinguishing gas is blown to the arc and the arc is extinguished. A puffer type gas circuit breaker that extinguishes an arc is used.

In the puffer type gas circuit breaker, a puffer chamber and an insulating nozzle are provided in the movable electrode portion. The puffer chamber is composed of a puffer piston and a puffer cylinder, and compresses the arc extinguishing gas. On the other hand, the insulating nozzle is made of an insulating material such as fluorine resin, and injects the arc-extinguishing gas compressed in the puffer chamber into the arc. Since such a puffer type gas circuit breaker has a large energizing current and breaking current and can be used in a high voltage system, it is easy to increase the voltage and capacity.

In recent years, as the demand for electric power has increased, it has been required to develop a gas circuit breaker having a higher voltage and a larger capacity. Puffer type gas circuit breakers have become widely used to meet this demand.

[0005]

However, in the puffer type gas circuit breaker, when the nozzle made of fluororesin is exposed to the arc for a long time, the energy rays emitted from the arc penetrate into the inside of the nozzle. Be absorbed. As a result, voids are generated in the nozzle, and the fluororesin forming the nozzle is carbonized. As a result, the insulation performance of the nozzle is significantly deteriorated, and the withstand voltage performance is insufficient after a large current is interrupted many times, which may cause a flashover between the circuit breakers. In addition, if the nozzle is exposed to the arc for a long time, the abrasion of the fluororesin due to the arc also progresses, so the force of the gas flow of the arc-extinguishing gas sprayed from the nozzle to the arc weakens, and the arc extinguishing ability deteriorates. Become. Therefore, the interruption performance of the puffer type gas circuit breaker deteriorates, the life of large current interruption is short, and defects such as re-ignition occur during opening and closing of a normal sound phase occur.

The present invention has been made to solve the above problems, and an object thereof is to ensure excellent blocking performance by minimizing the occurrence of voids in the nozzle, carbonization of resin, and wear of the nozzle. Another object of the present invention is to provide a puffer type gas circuit breaker having a further improved breaking life.

[0007]

In order to achieve the above object, the present invention provides a container in which an arc extinguishing gas is enclosed, and a fixed electrode portion and a movable electrode which are arranged in the container and can be separated from each other. Part, a puffer chamber that is composed of a puffer piston and a puffer cylinder in the movable electrode part, and compresses an arc-extinguishing gas; an insulating nozzle that injects the arc-extinguishing gas compressed in the puffer chamber; In a puffer type gas circuit breaker in which the nozzle blows an arc extinguishing gas against an arc generated between the electrode part and the movable electrode part to extinguish the arc, the nozzle heats the fluororesin to a temperature equal to or higher than the melting point. However, it is characterized by being composed of a material irradiated with an electron beam.

[0008]

According to the puffer type gas circuit breaker of the present invention, since the fluorine resin which is heated to a temperature higher than the melting point and irradiated with the electron beam is used as the material of the nozzle, even if the energy ray generated from the arc enters the nozzle, Can prevent cracking and carbonization,
Nozzle wear can also be minimized.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic sectional view of an embodiment of the present invention. Figure 1
In FIG. 1, the nozzle 1 is provided in a container (not shown) in which SF ₆ gas is sealed and injects SF ₆ gas to the arc 3 generated between the fixed electrode portion and the movable electrode. The nozzle 1 is made of an insulating material made of a fluororesin irradiated with an electron beam heated to a melting point or higher.

The portion of the inside of the nozzle 1 (lower side in the figure) that contacts the arc 3 becomes the arc contact portion. This nozzle 1
A surrounding gas space 2 in which SF ₆ gas is enclosed exists around the. The arc 3 impinges the energy ray 4 toward the nozzle 1.

According to this embodiment, even if the energy ray 4 enters the nozzle 1, the energy ray resistance of the nozzle is about 5 times greater than that of the conventional fluororesin nozzle. Therefore, the wear of the nozzle 1 can be minimized, and the arc resistance of the nozzle 1 is improved. Therefore, the puffer type gas circuit breaker of this embodiment can ensure high breaking performance. In this embodiment, a fluororesin is used which is obtained by heating the material of the entire nozzle to a temperature equal to or higher than the melting point and irradiating it with an electron beam.

FIG. 2 is a schematic sectional view of another embodiment of the present invention. As shown in the figure, only the portion 11 of the hole portion of the nozzle 1 formed in the arc contact portion 5 is heated to the melting point or higher and irradiated with an electron beam to improve the arc resistance. . 12 is a tetrafluoroethylene resin. It goes without saying that this embodiment also has the same effects as the above embodiments.

[0013]

As described above, according to the puffer type gas circuit breaker of the present invention, since the nozzle is made of an insulating material which is made by irradiating an electron beam by heating a fluororesin to a melting point or above, The energy resistant wire is improved, the arc resistance of the nozzle can be improved, and high breaking performance can be secured. In particular, the life for the large current interruption, which is the most important for the gas circuit breaker, is improved, and the withstand voltage performance after the large current interruption is also improved. Furthermore, it is possible to prevent deterioration of the sound phase opening / closing ability, and to significantly improve the performance against the adverse effect on the system due to re-ignition and the situation such as inability to cut off, and to obtain high reliability.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of another embodiment of the present invention.

[Explanation of symbols]

1 ... Nozzle, 2 ... Surrounding gas space, 3 ... Arc, 4 ... Energy ray, 5 ... Arc contact part, 11 ... Heating above melting point,
Electron-beam irradiated tetrafluoroethylene resin, 12 ... tetrafluoroethylene resin.

Claims (1)

[Claims] 1. A container in which an arc extinguishing gas is sealed, a fixed electrode part and a movable electrode part which are disposed in the container and can be contacted and separated, and a puffer piston and a puffer cylinder in the movable electrode part. A puffer chamber for compressing the arc-extinguishing gas, an insulating nozzle for injecting the arc-extinguishing gas compressed in the puffer chamber, and the nozzle for the arc generated between the fixed electrode part and the movable electrode part. In a puffer type gas circuit breaker for extinguishing the arc by blowing an arc-extinguishing gas, the nozzle is made of a material obtained by heating a fluororesin to a temperature higher than its melting point and irradiating it with an electron beam. Puffer type gas circuit breaker.