Research of lightning protection method of direct distribution line of ventilator station of a coal mine
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摘要: 针对直配线路上的旋转电动机易受雷击损坏的问题，分析了某煤矿通风机站直配线路的防雷保护现状及存在的问题，指出直配线路仅依靠避雷器的保护是不够的，旋转电动机的防雷保护应考虑主绝缘、匝间绝缘和中性点绝缘的保护要求；提出了一种安全可靠的防雷保护方法，即在直配线路母线侧避雷器端并联电容、电缆进线端串联电抗的方法，并分别从旋转电动机主绝缘、匝间绝缘和感应雷过电压防护等方面进行效果分析。仿真结果表明，该防雷保护方法能有效限制雷电侵入波的陡度和幅值。Abstract: In view of problem that rotary motor of direct distribution line is easy to be damaged by lightning, the paper analyzed status of lightning protection of direct distribution line of ventilator station of a coal mine and its problems, indicated that the direct distribution line only depends on protection of arrester is inadequate, the lightning protection of the rotary motor should consider protection requirements of main insulation, turn-to-turn insulation and neutral-point insulation. It proposed a safe and reliable lightning protection method, namely the method parallels capacitor in arrester end of bus side and series reactance in incoming end of cable for the direct distribution line, and made effect analysis for the lightning protection method from main insulation, turn-to-turn insulation and prevention of lighting induced voltage of the rotary motor. The simulation result shows that the lightning protection method can effectively limit gradient and amplitude of incoming lightning.
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Keywords:
- direct distribution line /
- rotary motor /
- lightning protection /
- insulation /
- arrester /
- lighting induced voltage
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