This paper expatiates on the concept of earth short-circuit current, discussing and computing the shunt coefficient of overhead ground wires, cable lines and hybrid overhead cable lines.

为此，阐述了入地电流的概念，对输电线路架空避雷线、电缆线路及架空电缆混合供电线路的分流系数进行了探讨和计算。

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For short - circuit faults occurring in power systems, the behavior of shunt active power filter APF is analyzed. It is concluded that the overcurrent phenomena will happen during the fault period.

对并联型电力有源滤波器(APF)在电力系统发生各种短路故障时的行为进行了分析，得出了在系统发生故障期间APF会发生过流现象的结论。

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