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根据《金属非金属矿山安全规程》的规定:“井下电气设备禁止接零。采用矿用变压器，若采用普通变压器禁止中性点直接接地，地面中性点直接接地的变压器不得向井下供电。”我公司井下的低压配电系统采用了电源申性点不接地的lT系统。该系统的一个突出优点就在于它在发生一相接地故障的情况下，所有的三相用电设备仍可暂时继续运行，但同时出现一个问题就是另两相的对地电压将由相电压升高到线电压，增加了对人rrrrrrrrn身的安全威胁。因此，有必要做好井下低压配电系统单相接地的监察工作。
According to “Regulations on Safety of Metallic Nonmetal Mines”: “Downhole electrical equipment is forbidden to connect to zero.If a mining transformer is used, if the ordinary transformer is used to prohibit the neutral point from being directly grounded, the transformer whose ground neutral point is directly grounded shall not supply power to the underground.” Our company’s underground low-voltage power distribution system uses the power of the point of non-grounding lT system. One of the outstanding advantages of this system is that in the event of a phase-to-ground fault, all three-phase electrical equipment can still be temporarily operated, but at the same time there is a problem that the voltage of the other two phases will be increased from the phase voltage High line voltage increases the threat to human security. Therefore, it is necessary to do a good job of underground single-phase ground monitoring of low voltage power distribution system.