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Based on the relative theories about electric circuit and synchronous generators " post - fault transient , a practical computerized method making use of node impedance matrix is proposed to calculate the instantaneous currents of a faulty power system 本文基于电路理论和发电机的短路过渡过程理论,利用节点阻抗阵推导出电力系统短路时任意时刻短路电流的实用计算机算法。