Measurement of Currents Induced on Overhead Line From Very Close Natural and Triggered Lightning
Measurement of Currents Induced on Overhead Line From Very Close Natural and Triggered Lightning
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DOI：
10.1109/temc.2023.3243639
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发表时间：
2023-06
影响因子：
2.1
通讯作者：
Xiaojun Luo;Qi Zhang;Li-hua Shi
中科院分区：
文献类型：
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作者：
Xiaojun Luo;Qi Zhang;Li-hua Shi
分别从时域、频域和时频域分析了20 m自然雷击和8 m触发雷击对架空线路产生的感应电流。结果表明，大多数电流的能量峰值远远滞后于其时域峰值。感应电流各频率分量的到达时间随频率呈非单调变化，特别是自然雷电引起的感应电流到达时间。最高频率分量的能量不一定最强。当它早于时域电流峰值时，参考时域阈值电压设计的保护措施可能无法如期启动，并且由于较高频段的能量更容易耦合到端子上而引起的意外损坏。与自然闪电相比，触发闪电产生的电流峰值与能量最大值之间的时间延迟更小，时域电流廓线和能量分布的持续时间更短。此外，触发雷击产生的电流一致性优于自然雷击产生的电流一致性。
Induced currents on an overhead line due to a natural lightning with a strike distance of 20 m and a triggered lightning with a strike distance of 8 m were analyzed in time domain, frequency domain, and time–frequency domain, respectively. The results indicated that the energy peak of most currents lagged far behind its time-domain peak. The arrival time of different frequency components of the induced currents varies nonmonotonically with respect to frequency, especially that of the currents caused by the natural lightning. The energy of the highest frequency component is not necessarily the strongest. When it occurs earlier than the time-domain current peak, the protection measures designed by referring the time-domain threshold voltage may not start as expected, and accidental damage that may be incurred owing to that energy in the higher frequency band is more easily coupled to the terminal. Compared with the natural lightning, the smaller time delay between current peak and its energy maxima is yielded in the triggered lightning, as well as the shorter duration time of both time-domain current profile and energy distribution. Additionally, the consistency among currents induced by the triggered lightning is better than that excited by the natural lightning.