The Domestic and Foreign Standard Analysis of T100a Test for High Voltage AC Circuit Breaker

As a key equipment of the substation, the high voltage AC circuit breaker is very important to be checked by standard type test before it is put into mass production. The T100a test evaluates the asymmetric full-current breaking capacity, which is one of the most critical and difficult test for high voltage AC circuit breaker. At present, domestic circuit breaker manufacturers and test stations generally test according to the national standards “GB1984-20l4”. Foreign circuit breaker manufacturers and test stations generally test according to IEC standards “IEC62271-100-2017”. In this paper, according to different standards, taking the neutral point effective grounding system and single-phase tests in substitution for three-phase conditions as example, the T100a test method and test parameters are compared; the breaking energy is simulated and analyzed. According to different standards, taking a self-blast circuit breaker as an example, the air flow field simulation analysis is carried out, and the key parameters such as pressure and temperature in the expansion chamber are compared. Through the above analysis, it is considered that compared with the GB standard, according to the IEC standard for T100a test, the input current is larger, the breaking energy is larger, the breaking performance is more severe.