pmallfunctiooo

代码说明：

  电力系统故障计算，能计算单相短路，单相接接地短路，三相短路，两相短路接地，两相短路 (power system fault, can calculate the single-phase short ccircuit, short-circuit to the single--phase and three-phase short-circuit, two-phase short-circuit grounding, two phase short circuit )