接触器操作过电压研究

Research on Switching Overvoltage for Contactor

分断操作时,接触器线圈两端将产生严重的过电压。采用机械开关触点式继电器控制,操作过电压幅值在1.2～4.2kV之间,持续时间不超过3ms。系统中实际的操作过电压并不仅是衰减的振荡电压波,而且富有高频增幅振荡波、方波和衰减振荡波等成分,这些特性与回路参数尤其是控制开关的性能有关。

When a contactor breaks,a serious overvoltage would occur between the two ends of contact coils.Under controlling by mechanical switch contact relay,the amplitude of switching overvoltage was between 1.2～ 4.2 kV for less than 3 ms.An overvoltage which occurred in actual operation of the system was not only a damped oscillatory wave,but compound of high-frequency oscillatory wave with amplitude growth,square wave and damped oscillatory wave.These characteristics were relevant to the circuit parameters,especially the performance of the control switching.