空气绝缘隔离开关开合容性小电流试验浅析

Analysis on Small Capacitive Current Switching Test of Air-insulated Disconnector

介绍了标准规定的空气绝缘隔离开关开合容性小电流试验的回路,以及标准中对其进行的理论分析,结合实际试验时得到的波形,对比并分析了此回路和不含有电感以及电源侧电容很小的气体绝缘隔离开关试验标准回路的波形方面的差异,得出了在此回路下隔离开关两端对地峰值过电压在试验过程中更均衡,燃弧时间更长,重击穿时瞬态电流更高的特点,推荐采用此回路进行试验。

The test circuit on small capacitive current switching test of air-insulated disconnector specified by the standards and its theoretical analysis in the standard are introduced.Combining with the wave form gained in the actual test,the difference of the wave form between this test circuit and the standard circuit of air-insulated disconnector test without inductance and with only low capacitance value at the source side is compared and analyzed.The characteristics,such in the standard circuit the peak over voltage to earth at both sides of the disconnector is more even,the arcing time is longer and the transient current during restriking is higher,are obtained.And the circuit is recommended to be adopted for the small capacitive current switching test of air-insulated disconnectors.