Arc extinguishing chamber and breaker adopting arc extinguishing chamber

Abstract

The invention relates to an arc extinguishing chamber and a breaker adopting the arc extinguishing chamber. The arc extinguishing chamber comprises a moveable end part, wherein the moveable end part comprises an air cylinder, a piston, a pull rod and a separating plate; the piston is arranged in the air cylinder; the air cylinder is separated into an expanding chamber and an air pressure chamber by the piston and the separating plate; a normal connected channel for connecting the expanding chamber with the air pressure chamber is arranged on the separating plate; and the area of the normal connected channel is only 15%-25% of the section area of the air cylinder, so that the process of the compressed air in the air pressure chamber entering the expanding chamber through the normal connected channel so as to be blown to the arc is not influenced, and the excessive arc energy is also prevented from being transferred to the air pressure chamber and resulting in the increasing of operation power. With such a structure, the arc extinguishing chamber can be used for effectively extinguishing arc when the current is broken on a circuit exceeding the limited voltage level in the prior art.

Description

technical field [0001] The invention relates to the field of high-voltage switchgear, in particular to an arc extinguishing chamber and a circuit breaker using the arc extinguishing chamber. Background technique [0002] The arc extinguishing chamber of the traditional high voltage circuit breaker adopts a composite compressed air structure and is filled with sulfur hexafluoride gas. During the opening process, the pressure cylinder and the pressure piston move relatively, and the gas in the pressure cylinder is compressed. At the same time, the sulfur hexafluoride gas in the compression cylinder is heated by the arc, so that the gas inside and outside the compression cylinder forms a relatively high pressure difference. The high-pressure gas in the compression cylinder blows the arc at the fracture through the nozzle. When the current crosses zero, the high-speed airflow blows away the charged ions in the arc burning area, restores the insulation performance of sulfur hexa...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an arc extinguishing chamber that solves the problem of poor arc extinguishing effect or inability to extinguish the arc when the short-circuit current of the circuit exceeding the limited voltage level is extinguished in the prior art; at the same time, the purpose of the present invention is also to A circuit breaker using the arc extinguishing chamber is provided

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