220kV限流器对断路器开断近区故障的分析

Impact Analysis of 220kV Current Limiter Circuit Breaker Disconnect Failure in Area Near

针对220kV系统断路器在开断近区故障时出现不能开断的案例,从无限流器、有限流器、故障限流器三种运行方式入手,分别建立了高压断路器和限流器等值模型,通过计算模型中的所有参数,分析了限流器对断路器开断近区故障时电感和电压对固有恢复电压的影响。计算结果表明:当电力系统正常运行时限流器几乎不呈现阻抗;当电力系统发生短路故障时,限流器瞬间呈现高阻抗,快速限制短路电流,避免了短路故障给电力系统带来的巨大危害。在选择故障限流器的限流比时,建议选择比较小的区域,最好小于0.5。

Introduced the case of circuit breaker disconnect failure in area near of 220 kV system. Discussed the problem from the three kinds of operation modes, such as collector from the infinite, limited flow apparatus, fault current limiter, set up a high voltage circuit breaker and current limiter equivalent model, through the calculation of all parameters in the model, and analyses the influence of current inductor and voltage on the nat- ural recovery voltage when limiter circuit breaker disconnect failure in area near occurred. Calculation results show that the normal operation of power system rime ~imit is hardly present impedance; When power system occurred short-circuit fault, current limiter moment presents high impedance, limiting short circuit current rapidly can avoid the huge harm to power system. In selection of current limiting fault current limiter, it is advised to choose a smaller area, the best is less than 0.5.