Circuit breaker protection method

Abstract

The invention relates to a circuit breaker protection method, which comprises the steps of firstly installing a circuit breaker for inflatable protection in a special protection device; introducing a helium gas into the circuit breaker arranged in a protection shell from a corresponding air pipe through a hose, carrying out leakage detecting on the circuit breaker, carrying out vacuum supply treatment on the protection shell and the qualified circuit breaker arranged in the protection shell through a vacuum pump respectively; filling the circuit breaker with nitrogen from a nitrogen gas chamber after vacuum supply is completed; and introducing air into the protection shell from an air chamber while filing the nitrogen, wherein the aeration quantity is one atmosphere pressure. The circuit breaker protection method has the advantages that a circuit breaker shell can be effectively prevented from deforming when a protective gas is filled by adding the protection shell to the outer end of the circuit breaker; and furthermore, the nitrogen is adopted as the protective gas instead of traditional sulfur hexafluoride, so that the surrounding environment is not polluted by leakage of the nitrogen on the basis of ensuring the insulating property of the circuit breaker.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a circuit breaker protection method. Background technique [0002] ZW20-12 outdoor AC high-voltage boundary vacuum circuit breaker is a user boundary switch. It is mainly composed of ZW20-12 vacuum circuit breaker body, fault detection controller and external voltage transformer. [0003] At present, for this type of circuit breaker, in order to ensure its insulation performance, the traditional method directly fills sulfur hexafluoride into the circuit breaker to ensure its insulation performance. However, the above method has the following defects: when filling sulfur hexafluoride into the circuit breaker, it is necessary to ensure that the pressure difference between the internal pressure of the circuit breaker and the external pressure does not exceed 0.05MPa, otherwise it will cause open circuit The deformation of the breaker shell affects its use; in addition, the circuit breaker itsel...

AI Technical Summary

Problems solved by technology

However, the above method has the following defects: when filling sulfur hexafluoride into the circuit breaker, it is necessary to ensure that the pressure difference between the internal pressure of the circuit breaker and the external pressure does not exceed 0.05MPa, otherwise it will cause open circuit The deformation of the breaker shell will affect its use; in addition, the circuit breaker itself cannot achieve a complete sealing effect, so there must be some leakage of sulfur hexafluoride, and due to the characteristics of sulfur hexafluoride itself, it will be harmful to the pollute the surrounding environment

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