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基于先导闪络判据的变电站侵入波过电压的研究

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Keywords: 雷电侵入波过电压,闪络判据,变电站,绝缘配合

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Abstract:

变电站的雷电侵入波过电压与线路绝缘子串的闪络情况密切相关,文中基于ATP-EMTP,建立了500kV变电站和进线段的雷电计算模型,研究了绝缘子串闪络判据对变电站雷电侵入波过电压的影响,校验了采用更符合线路实际运行情况的先导闪络判据时变电站的绝缘配合情况。研究结果表明:绕击情况下,绝缘子串采用先导闪络判据时变电站设备上的雷电过电压增大。其中距变电站1.5km内,可能会对变电站设备产生威胁;而距离变电站1.5km后,由于雷电波在传播过程的衰减和畸变,侵入波对变电站设备不构成威胁。为保证变电站的安全运行,应提高变电站进线段的防绕击措施。

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