For impressed current protective system, its technological advances in design and installation are given.

对于外加电流保护系统，介绍了其设计、安装等方面的技术进展。

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Selection of ground current, comparison of isolation level and consideration of protective device in the resistance ground system are presented.

介绍了电阻接地系统中，接地电流的选取，绝缘水平比较，保护配置方面的考虑。

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The phase comparison error is the primary factor leading to mistaken action in the selective leakage protective system of underground LV networks based on zero sequence current direction.

在基于零序电流方向原理的矿井低压电网选择性漏电保护中，比相误差是导致保护误动的主要因素。

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