Research on influencing factors of arc grounding over-voltage in mine power supply system
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摘要: 为了全面研究接地电阻、线路电阻、故障位置、对地电容、相间电容、燃弧时刻这6种因素对矿井供电系统弧光接地过电压的影响，采用实时数字仿真仪搭建典型矿井供电系统模型和间歇性电弧接地模型,结合工频熄弧理论和高频熄弧理论对弧光接地过电压的形成过程及影响因素进行理论分析和仿真研究。结果表明，电弧重燃时刻对弧光接地过电压的影响最为显著，线路电阻、接地电阻及相间电容的影响较大，故障位置、对地电容的影响较小;弧光接地过电压是系统参数的综合反映，不同的矿井供电系统过电压值会有很大差异。Abstract: In order to comprehensively study influence factors such as grounding resistance, line resistance, fault location, grounding capacitance, interphase capacitance and arc ignition time on arc grounding over-voltage in mine power supply system, typical mine power supply system model and intermittent arc grounding model were built by using real time digital simulator, based on arc extinction theory of power frequency and arc extinction theory of high frequency, formation process and influencing factors of arc grounding over-voltage were analyzed theoretically, and the influencing factors were simulated. The simulation results show that arc ignition time has the most significant influence on arc grounding over-voltage, line resistance, grounding resistance and interphase capacitance have great influence, fault location and earth capacitance have small influence; arc grounding overvoltage is a comprehensive reflection of system parameters, and the overvoltage values of different power supply systems in mines vary greatly.
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