Circuit breaker

Abstract

The invention relates to a circuit breaker for improving insulating property while being capable of reducing the diameter of a metal container of the circuit breaker. The following components are arranged in the sealed container isolated by insulating clapboard of central conductor and filled with insulting gas: a fixed side conductor installed on the central conductor of insulating clapboard of one side; a fixed side contact element connected with the fixed side conductor; an electric arc contact terminal installed on the inner side of the fixed side contact element; a fixed side shielding hood allocated to surround the fixed side contact element; a movable element in contact with the fixed side contact element and the electric arc contact terminal and firstly cut off from the fixed side contact element before being turned off with the electric arc contact terminal; a spring driving the electric arc contact terminal to move along the axial direction if the movable element is cut off; and a following device of supporting framework; besides, a serially connected inductor provided with coil part or magnet is inserted between an electric arc extinguishing part of the electric arc contact terminal and the fixed side conductor.

Description

technical field [0001] The present invention relates to a circuit breaker, in particular to a circuit breaker arranged in a substation or a switching station. Background technique [0002] In a switching device such as a circuit breaker or a switch that constitutes a gas-insulated switching device, there is a high possibility of high-frequency switching surges during switching, especially for circuit breakers with relatively slow switching speeds. Reburning arcs are prone to occur during operation. [0003] The surge caused by the re-ignition arc during the switching operation of the circuit breaker ranges from several MHz to tens of MHz, and its frequency is high, and its frequency of occurrence is also high. Moreover, since such a surge is a steep overvoltage with a high frequency of occurrence, Therefore, the problem of low insulation performance of the circuit breaker is likely to occur. [0004] As one of the countermeasures for suppressing the generation of the surge...

AI Technical Summary

Problems solved by technology

[0008] However, according to the structure of the above-mentioned Patent Document 2, the shield 103 is exposed to the arc, and as a result, the shield 103 is degraded and consumed, and there is a danger of insulation degradation.

[0009] In addition, according to the structure of Patent Document 2, since the shield case 103 is exposed to the arc, a high voltage is applied to this part, and therefore, insulation cannot be ensured unless a certain distance is maintained between the shield case 103 and the metal container. As a result, there is a limit to the miniaturization of metal containers

[0010] In addition, according to the structure of Patent Document 2, in order to suppress the deterioration and consumption of the shield 103 caused by exposure to the arc, it is necessary to use a noble metal material that makes the shield 103 less molten, and therefore, there is a problem that the manufacturing cost increases.

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