随着电子技术的发展,高灵敏度、快速动作型漏电保护装置获得了极大的发展。但是,由于煤矿井下工作环境恶劣,电气设备长时间运行容易绝缘老化、受潮和受损,失去绝缘作用,因而经常会出现漏电故障。本文在深入研究矿用高压组合开关照明保护箱及其操作经验的基础上简化了该保护箱,解决了其外壳带电的问题。既便于井下工人的操作,又方便检修及故障点的排查。 With the development of electronic technology, high sensitivity, rapid action type leakage protection device has made great development. However, due to the poor working environment in coal mines, electrical equipment often runs for a long time and is prone to aging, dampness, damage and loss of insulation. Therefore, leakage faults often occur. In this paper, in-depth study of mine high voltage combined switch lighting protective box and its operation experience based on the simplified case, to solve the problem of its shell charged. Not only facilitate the operation of downhole workers, but also easy troubleshooting and troubleshooting.