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煤矿供电系统的中性点运行方式,基本上有三种:中性点直接接地、中性点不接地(绝缘)和中性点经消弧线圈接地。 地面供电系统采用的是中性点直接接地的运行方式。中性点直接接地时,当发生单相接地故障时,故障相电位接近于零,非故障相对地电压接近于相电压,维持了相线对地电压不升高。所以,降低了线路和设备的对地绝缘要求,相应降低了投资。同时,人体触及非故障相时降低了接触电压值,有利于人身安全。
There are basically three kinds of neutral point operation modes in coal mine power supply system: neutral point is directly grounded, neutral point is not grounded (insulation) and neutral point is grounded by arc suppression coil. Ground power supply system is used in the direct grounding of the neutral point of operation. When the neutral point is directly grounded, when the single-phase ground fault occurs, the potential phase of the fault is close to zero, the voltage of the non-fault is close to the phase voltage, and the phase-to-earth voltage is maintained. Therefore, reducing the line and equipment on the ground insulation requirements, a corresponding reduction in investment. At the same time, the human body touches the non-fault phase reduces the contact voltage value, is conducive to personal safety.