华北电力大学科技学院电力系统故障分析课 程设计。计算5节点电路图中各节点正负零序电压，以及ABC三相相电压，还有9条支路的正负零序电流，以及ABC三相相电流。-Course design of power system fault analysis in College of science and technology of North China Electric Power University. Calculate the positive and negative zero sequence voltage of each node in the circuit diagram of the 5 node, and the ABC phase voltage, there are 9 branches of the positive and negative sequence current, and the ABC three-phase phase current.