杨文强,张蓬鹤,张保亮.高海拔微型断路器分断性能的数值仿真分析及应用[J].电测与仪表,2022,59(6):181-187. Yang Wengqiang,Zhang Penghe,Zhang Baoliang.Numerical simulation analysis and application of breaking performance of high altitude miniature circuit breaker[J].Electrical Measurement & Instrumentation,2022,59(6):181-187.
高海拔微型断路器分断性能的数值仿真分析及应用
Numerical simulation analysis and application of breaking performance of high altitude miniature circuit breaker
The breaking performance of the miniature circuit breaker with air as arc extinguishing medium is reduced, and the harm to the power system and the equipment caused by large current in case of short circuit fault is increased in high altitude environment. The breaking process was divided into four stages according to the changing law of arc voltage in high altitude environment, the corresponding numerical equations of arc voltage and current were derived, the influence of the expected breaking currents, the closing phase angle, air pressure and arc voltage on the breaking process were analyzed in the paper.The numerical equations were solved to obtain the arc current and voltage waveforms of the circuit breaker under different conditions. And the breaking test was carried out under different current and closing phase angle, the most stringent closing phase angles were obtained for different expected large currents. Then the law of arc voltage and large current harm characteristic parameters changing with the air pressure dropping were analyzed under these phase angles. The percentages of the large current harm increase including the arc energy increase and the Joule integral increase were obtained in high altitude environment，circuit breaker optimal design was carried out, the arc parameters were calculated numerically, and the degree of large current harm reduction after the circuit breaker structure was optimized was verified by experiments.
