High-voltage gas circuit breaker breaking performance evaluation method and system

Abstract

The invention relates to a high-pressure gas breaker breaking performance assessment method and system. The method comprises the following steps of: carrying out magnet dynamic simulation on an arcing process of a high-pressure gas breaker to obtain total arc voltage and arc current before the arc current crosses zero; extracting model parameters of a preset zero area arc model; taking the total arc voltage and the arc current as initial conditions to solve past-arc current under the action of transient recovery voltage on the basis of the zero area arc model; judging whether the high-pressure gas breaker causes thermal breakdown or not in the breaking process according to change trend of the past-arc current; obtaining pressure intensity distribution and temperature distribution in an arc extinction chamber under the action of the past-arc current through magnet dynamic simulation, comparing field intensity, caused by the action of the transient recovery voltage, at each point of the arc extinction chamber, corresponding temperature and critical breakdown field intensity, and assessing the probability of electric breakdown in the arc extinction chamber. By adoption of the method and system provided by the invention, the comprehensive assessment for the past-arc thermal breakdown and electric breakdown characteristics of the high-pressure gas breaker is realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and system for evaluating the breaking performance of a high-voltage gas circuit breaker. Background technique [0002] High-voltage gas circuit breakers (GCB), especially high-voltage sulfur hexafluoride (SF6) circuit breakers, are widely used in power systems due to their excellent breaking performance. In the development process of large capacity and miniaturization of circuit breakers, a prominent problem is how to accelerate the heat recovery process after the arc and improve the recovery strength of the medium after the arc through the optimal design of the arc extinguishing chamber and its coordination with the characteristics of the operating mechanism. to reduce the probability of re-ignition. [0003] In recent years, a lot of work has been done on the magnetohydrodynamics (MHD) simulation of the high voltage gas circuit breaker arc at home and abroa...

AI Technical Summary

Problems solved by technology

[0004] Although evaluating the breaking performance of high-voltage circuit breakers is very important for the optimal design and performance improvement of products, there is no comprehensive evaluation method or means for the after-arc thermal breakdown and electrical breakdown characteristics of high-voltage gas circuit breakers

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