中文摘要：

在高压直流输电系统中,由于交流滤波器用断路器投切频繁,工作环境恶劣,高压断路器开断电路后容易发生绝缘击穿故障。基于一起交流滤波器燃弧故障实例,简述了事故过程,分析了断路器处于正常工作阶段、击穿故障阶段、持续性燃弧熄弧阶段和完全击穿阶段等不同阶段时相应的滤波器支路电压电流特性,计算了断路器正常工作时电流谐波含量和总谐波畸变率。最后,通过分析各个阶段的电弧电压和电流动态变化录波波形以及现场断路器解体检查情况,总结了燃弧故障发生的原因,并提出相关建议,为交流滤波器用断路器的生产和运维检修提供了依据。

英文摘要：

In HVDC systems, because of switching fi＇equently and bad working conditions, AC filter circuit breaker can occur the insulation breakdown fault easily. Based on a real case of AC filter arc fault, firstly, the process of accident is described briefly, and then when the circuit breaker is in different stages such as the normal condition, the breakdown fault stage, the continuous arc burning and extinction stage and spark-over totally, the corresponding arc voltages and currents in different stages are compared and analyzed, besides, the current harmonics and the total harmonic distortion rates when circuit breaker state operates normally are calculated. At last, through analyzing the dynamic record waveform of arc voltages and currents in different stages and the strip inspection of on-site circuit breaker, the reasons of arc fault are explained, and some relevant suggestions are given, which provides references for production and operating maintenance of circuit breaker used in AC filter.