通过对华北电网公司直属单位近年来的雷击故障统计分析，掌握了防雷重点线路和线路的重点防雷区段。
Through analysis of lightning failures of North China Power Grid, we have known the important anti-lightning transmission lines and the important anti-lightning field of the transmission lines.
通过对华北电网公司直属单位近年来的雷击故障统计分析，掌握了防雷重点线路和线路的重点防雷区段。
Through analysis of lightning failures of North China Power Grid, we have known the important anti-lightning transmission lines and the important anti-lightning field of the transmission lines.
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