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在井下低压电网供电系统中,存在漏电电流问题,这种漏电电流的存在与井下低压电网采用中性点不接地的供电方式有关。三相电对地呈绝缘状态,存在三相对地绝缘电阻Ra、Rb、Rc。由于供电线路中使用大量电缆,存在三相对地分布电容Ca、Cb、Cc。由于存在绝缘电阻和分布电容,使三相电形成电阻性和电容性负载,产生了IR和IC电流。这些电流的大小与绝缘电阻和分布电容值大小有直接关系。为了确保矿井和人身安全,必须充分认识井下漏电电流的危害。
In the underground low-voltage power supply system, there is leakage current problem, the presence of such a leakage current and the underground low-voltage power grid neutral point is not connected to the power supply. Three-phase power to the ground was insulated, there are three relative to the insulation resistance Ra, Rb, Rc. Due to the large number of cables used in the power supply lines, there are three distributed capacitors Ca, Cb, Cc. Due to the presence of insulation resistance and distributed capacitance, the three-phase electricity forms resistive and capacitive loads, producing IR and IC currents. The size of these currents is directly related to the size of the insulation resistance and distributed capacitance. In order to ensure mine and personal safety, we must fully understand the hazards of underground leakage current.