高压并联电容器组的合闸涌流计算方法的研究

在实践中发现,高压并联电容器组实测的合闸涌流与现行规程的计算结果相互矛盾。鉴于合闸涌流的数值十分重要,直接影响到断路器触头不检修的电寿命和电容器组继电保护的整定计算,重新推导了投切电容器组的涌流计算公式,推荐了单组电容器合闸的涌流计算公式,电抗率相同、多组电容器组合闸的涌流计算公式,以及2种电抗率时、多组电容器组合闸的涌流计算公式,供工程技术人员参考。算例计算结果表明了这些计算公式的正确性。

A Method to Calculate Close Push Current of High Voltage Shunt Capacitor Bank

It is found that the measured results of close inrush currents of high voltage shunt capacitor banks are in contradiction to those calculated by the calculation method given by currently available rule. In view of the significance of the value of close inrush current that directly affects electrical lifetime of un-maintained conductors of circuit breaker, the calculation formula for close inrush current of capacitor bank to be switched is anew derived. Following formulae which are available for reference by engineers and technicians, such as the formula to calculate the inrush current of single shunt capacitor bank while it is being switched on, the formula to calculate the inrush currents of multi shunt capacitor banks with same reactance rate while they are being switched on and that to calculate the inrush currents of multi shunt capacitor banks with two different reactance rates while they are being switched on, are recommended. Case study results show that these calculation formulae are correct.