目前,我国矿山井下配电变压器广泛采用中性点不接地供电系统,并禁止由地面上中性点接地的变压器和发电机向井下供电。在狭窄潮湿、条件恶劣的井下巷道,供配电设备、低压动力设备及通风设备等电气设施,极易发生漏电事故危及人身安全。因此,解决好电气保护和接地系统的问题,具有非常重要的意义。 At present, China’s mine distribution transformer widely used neutral ungrounded power supply system, and prohibited by the ground on the grounding of the transformer and generator to the underground power supply. In narrow and humid, poor conditions of underground tunnels, power distribution equipment, low-voltage power equipment and ventilation equipment and other electrical facilities, prone to leakage accidents endanger personal safety. Therefore, to solve the problem of electrical protection and grounding system is of great significance.