考虑变电站内接线和拓扑瞬态调整的断路器短路电流分析OA北大核心CSTPCD

With the development of power grids,the problem of excessive short-circuit current has grown prominent.The short-circuit current-limiting method,which is based on dynamic adjustment of the system topology,can effectively limit the short-circuit current.This study analyzed the influence of the transient processes during topology adjustment on the short-circuit current of circuit breakers for typical wiring methods.The analysis method of the short-circuit current considering the wiring topology and circuit breaker action sequence was studied.Moreover,the characteristics of the circuit breaker current before and after the application of suppression measures to typical substations were studied.The results show that the fault location and circuit breaker action sequence have a significant impact on the short-circuit current characteristics of circuit breakers.In particular,for one-and-a-half circuit breaker wiring,the maximum short-circuit current of the circuit breaker appears during the process of breaking,and it passes through the circuit breaker that breaks the last.After a fault occurs,rapidly changing the system topology using fast circuit breakers before the conventional circuit breaker opens can effectively reduce the breaking current of the circuit breaker.