煤矿35 kV线路防雷保护间隙的研究

Research of lightning protection gap of 35 kV power line of coal mine

  • 摘要: 为验证保护间隙对35 kV线路的防雷保护效果,在ATP-EMPT电磁暂态分析软件环境下,以某矿区35 kV架空线路为模型,模拟雷击入侵35 kV变压器,对比加装保护间隙前后变压器高压侧过电压峰值,结果表明,35 kV线路在遭受单相或三相雷击后,保护间隙能够大幅降低变压器高压侧的雷电侵入波峰值;分析了加装防雷保护间隙后35 kV线路的耐雷水平与雷击跳闸率,结果表明线路耐雷水平降低,雷击跳闸率上升,但均符合DL/T 620—1997要求。应用结果表明,煤矿35 kV线路安装防雷保护间隙后能够有效抑制雷电波入侵变电装置,但需配合自动重合闸装置,以提高线路防雷的可靠性。

     

    Abstract: In order to test lightning protection effect of protection gap for 35 kV power line, the paper simulated lightning invasion in 35 kV transformer taking 35 kV overhead line of a mine as model by use of ATP-EMPT electromagnetic transient analysis software, and compared over-voltage peak value at high-voltage side of transformer before and after installing the protection gap. The compare result showed that the protection gap can significantly reduce the peak value of lightning invasion wave at high-voltage side of the transformer after 35 kV power line is subjected to single-phase or three-phase lightning. The paper also analyzed lightning withstanding level and rate of lightning trip of 35 kV power line with lightning protection gap, whose conclusions are the lightning withstanding level reduces and rate of lightning trip rises, while the two parameters satisfy requirements of DL/T 620-1997. The application results showed that the lightning protection gap installed on 35 kV line of coal mine can effectively inhibit lightning from invading substation device, but should run with automatic reclosing device for higher reliability of line lightning protection.

     

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