整流式故障电流限制器对高压断路器开合能力的影响

该文指出整流式故障电流限制器在限流过程中降低了短路电流幅值,改变了短路电流波形,明显地影响到高压断路器的关合开断能力。应用电磁暂态程序(EM TP)仿真计算了整流式故障电流限制器对高压断路器关合开断过程有影响的7种因素,包括开断电流值、三相开断时后两相开断电流值、短路电流最大值、电流过零前的电流下降率、电弧能量、恢复电压幅值及上升率。计算分析表明电流过零前的下降率较同样幅度的正弦电流可增大到6倍,电弧能量可增大50%,短路电流峰值将降至25%,后开相电流可增大29%。这些对高压断路器的开断、关合能力影响很大。

Influence on switching capability of HV circuit breakers by employing rectifier type fault current limiter

The rectifier type FCL not only reduces the amplitude of short circuit currents but also changes their waveform which seriously affects the making and breaking capability of HV circuit breakers.Therefore,it must be carefully to selected and test circuit breakers.An electrical-magnetic transient analysis was used to analyze 7 factors affecting the making and breaking process.These factors are the breaking current,the peak short circuit and making current,the breaking current for the second and third poles to clear,the decay rate as the current approaches zero,the arc energy,the rise rate,and amplitude of the recovery voltage.The results indicate that the decay rate as the current approaches zero may increase 600%,the arc energy may increase 50% and the peak making current and the short circuit current may be reduced by 40%.All these factors seriously affect the making and breaking capability of HV circuit breakers.