短路电流直流分量对断路器工作条件的影响不容忽视。常规的电力系统机电暂态仿真软件如BPA、PSASP及PSS/E等只能计算电网短路电流交流分量,无法直接准确计算短路电流的直流分量情况。基于EMTP软件建立了上海电网电磁暂态仿真模型,并在电磁暂态环境下研究了上海电网短路电流直流分量衰减特性,为上海电网经济合理地选择断路器提供了重要的依据。
The DC component of short circuit current has a great effect on the working condition of the circuit breaker.The conventional power system transient simulation softwares such as BPA,PSASP and PSS/E can only calculate the AC component of the grid short circuit current while can not directly calculate the DC component accurately.The transient electromagnetic simulation model for the Shanghai Grid was built and the decaying characteristics of the DC component of the shout circuit current in the Shanghai grid were studied in the transient electromagnetic environment,which provided an important basis for economically and reasonably selecting circuit breakers for the Shanghai Grid.