Down -conductor system connection should be welded, and the conclusion of common earthing system and adoption single earthing has been drawn.
引下线的连接应焊接，采用共用地网和一点接地方式接地等结论。
This Paper analyses the harm of single-phase earthing in electricity supply system of mine and introduces several type of common ways of leakage protection.
分析井下供电系统单相接地的危害，介绍几种常见的漏电保护方法。
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