电容补偿装置投切过电压的防护措施研究

Study of Switching Overvoltage Protection Measures for Capacitor Compensation Device

对采用阻尼与限压措施消除电容补偿装置投切过电压可能存在的危害进行了理论与仿真分析,并指出:投入过电压的防护主要应依靠装置本身的绝缘结构能力来实现,阻尼限压等保护措施对之效果不明显;截流过电压对开断时电弧重燃起重要的助推作用,电弧重燃会产生破坏力极大的过电压,利用高阻值阻尼电阻可消除截流过电压对电弧重燃的影响。

The harm of using damping and limiting measures to eliminate switching overvoltage of FC device was analyzed in theory and simulation. It presents that input overvoltage protection mainly depends on the insulation capability of the device and the effect of damping and limiting protection measures is not obvious. Cut-off overvoltage plays an important role in arc reigniting in the period of switching-off and arc reigniting will induce destructive overvoltage. The effect of cut-off overvoltage on arc reigniting will be eliminated completely by high value damping resistance.