描述
6ES5464-8ME11
发生操作过电压常与断路器的分、合闸速度，断路器触头的灭弧性能有关。
断路器灭弧能力不够强，在开断时触头间发生电弧重燃容易引起操作过电压，特别是在开断空载长线路时。
断路器灭弧能力太强，在电流尚未过零时，强行将电弧截断，会产生很高的感应电动势，从而形成很高的截流过电压。在开断变压器、电抗器、高压电机时可能发生强制灭弧（截流）过电压。
断路器合闸速度慢，在合闸过程中，动、静触头间产生高频电弧放电，引起高频振荡过电压波，沿着线路传向远方击穿变压器，在国内外都有文献记载实例。
真空断路器的动、静触头呈平面对接，在合闸时产生平面接触弹跳，引起高频振荡过电压，而且由于真空断路器灭弧性能极好，在触头弹跳时也可能出现截流过电压。在切、合空载变压器和切、和电容器时这类过电压事故时有发生。空载长线路在合闸时，电源电压对线路电感、电容构成的振荡回路充电，有时在达到稳态之前，要经历一个高频振荡过程，从而引起过电压。
在中性点不接地系统中发生单相不稳定电弧接地，接地点的电弧间隙性的熄灭和重燃，有可能在电网健全相和故障相产生过电压，称此为间隙性电弧接地过电压，也属于操作过电压。
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