【摘要】 本文基于某型超高压压气式SF₆断路器T100a试验，采用纳秒级别的电流零区测量装置，测试超高压压气式SF₆断路器的T100a开断试验，研究不同燃弧时间下开断高直流分量非对称短路电流时电弧的关键参数如熄弧尖峰、零前电弧电导、电弧电流等参数的变化规律。同时，基于断路器的内部结构建立气体电弧焓流物理仿真模型，研究不同燃弧时间时的压气室压力与开距变化。研究结果显示，在相同开断电流下以及一定的燃弧时间内，燃弧时间越长，熄弧尖峰越大，零前电弧电导越小。同时，压气室压力和触头开距也随着燃弧时间正向增加，使得断路器开断更容易，为实际应用中SF₆断路器开断非对称短路电流提供了理论依据。更多还原

【Abstract】 In this paper, based on the T100a test of a certain type of UHV pneumatic SF₆ circuit breaker, the T100a breaking test of EHV pneumatic SF₆ circuit breaker is tested by using a nanosecond current zero zone measuring device. The variation rules of arc key parameters such as arc peak, pre-zero arc conductance and arc current are studied when interrupting high DC component asymmetric short circuit current under different arc time. At the same time, based on the internal structure of the circuit breaker, the physical simulation model of gas arc enthalpy flow is established to study the pressure and distance change of the pressure chamber at different arc times. The results show that under the same on-off current, the longer the arc burning time is, the larger the arc quenching peak is and the smaller the pre-zero arc conductance is. At the same time, the pressure of the compressor chamber and the contact distance also increase positively with the arc time, which makes it easier for the circuit breaker to break, and that provides a theoretical basis for the SF₆ circuit breaker to break the asymmetric short-circuit current in practical application.更多还原