A new simulation method of switching overvoltage on shunt capacitors

Shunt capacitor banks are widely used in reactive power compensation, but the operating over voltage caused by the frequent operation of shunt capacitors would damage the insulated equipment and affect the reliability of power system. For simulating the switching off over voltage of shunt capacitors by vacuum circuit breakers, the model by adding a normal closed breaker to simulate restrike over voltage of breaker was proposed in this paper, then the restrike over voltage are calculated by using the proposed model, and the effects of limiting restrike over voltage of shunt capacitor by using MOA arrester are simulated. Simulation results are consistent with theory analysis.