At present, the precise location of fault tower struck by lightning still relies on manual line inspection, the search process is time-consuming and laborious. This paper proposes a lightning-strike fault tower localization criterion based on detection of residual magnetism on the tower. This paper firstly calculates the tower shunt coefficient of lightning current under different lightning striking faults. After a transmission tower is struck by lightning, residual magnetism is generated in the tower. An experiment platform is designed to study the residual magnetism characteristics of the fault and adjacent towers in the cases of both back flashover and shielding failure flashover at 110 kV, 220 kV and 500 kV voltage level. The specific values of residual magnetism under different conditions are obtained, and it is found that the residual magnetism of the fault tower is far larger than that of the adjacent towers. Besides, the effect of power frequency follow current during the flashover is also taken into account. Based on the experimental results, the residual magnetism law is summarized, and the criterion of lightning-struck tower localization and fault identification based on residual magnetism detection is proposed. Finally a field test was conducted which verified the validity of the method proposed.

中文翻译：

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基于剩磁检测的雷击铁塔定位与故障识别研究


目前，雷击故障塔的精确定位仍依靠人工巡线，查找过程费时费力。本文提出了一种基于杆塔剩磁检测的雷击故障杆塔定位判据。本文首先计算了不同雷击故障下的雷电流杆塔分流系数。输电塔被雷击后，塔内会产生剩磁。设计实验平台，研究110 kV、220 kV、500 kV电压等级回闪和屏蔽故障闪络情况下故障及邻塔的剩磁特性。得到了不同条件下剩磁的具体值，发现故障塔的剩磁远大于相邻塔的剩磁。此外，还考虑了闪络时工频续流的影响。基于实验结果，总结了剩磁定律，提出了基于剩磁检测的雷击塔定位和故障识别判据。最后进行了现场测试，验证了所提方法的有效性。