漏电是煤矿井下低压电网的主要故障形式之一。针对漏电保护有各种原理,它们各有优缺点,如直流检测式的全面性、旁路接地式的安全性、方向保护式的选择性等。在实际应用中使它们有机地结合起来将获得更好的效果。基于这一想法设计了旁直零漏电保护系统,该系统具有全面、安全、可靠及有选择性的保护性能。 Leakage is one of the major forms of failure in low voltage power grids in coal mines. There are various principles for the leakage protection, each of them has advantages and disadvantages, such as the comprehensiveness of the DC detection type, the safety of the bypass grounding type and the selectivity of the directional protection. In practical applications to make them organically combined will get better results. Based on this idea, a direct current zero leakage protection system has been designed, which has comprehensive, safe, reliable and selective protection performance.