KS C IEC 60909-3-2020 三相交流系统中的短路电流 - 第3部分:流过地球的两个单独的同时线对地短路和部分短路电流中的电流
Short-circuit currents in three-phase AC systems —Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth