火箭引雷至架空线路与地面电流对比分析

doi:10.19595/j.cnki.1000-6753.tces.222127

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Abstract

Most of the current rocket-triggered lightning experiments are conducted with lightning strikes on the ground. Related studies have shown that the properties of the struck object affect the parameters of the lightning. The paths of the lightning flow are very different between direct lightning strikes on the ground and direct lightning strikes on overhead line. It is necessary to obtain the lightning parameters of a real overhead line direct strike and analyze the similarities and differences between them and the ground direct strike lightning parameters for power system lightning protection.
Rocket-triggered lightning experiments were conducted at the Guangzhou Field Experiment Site for Lightning Research and Testing in Conghua, Guangzhou, during the summer of 2018 and 2019. Lightning strikes objects are divided into two kinds, one is overhead line and the other is ground. When lightning strikes on the ground, the lightning current is introduced by the inducing rod to the current measuring equipment installed in the ground launcher, and flows directly into the soil after measurement (grounding resistance is 6.7 Ω). When the lightning strikes on overhead line, the lightning current is first introduced by the current measuring equipment installed in the top of the tower launcher, measured and then flows into the 10 kV overhead line via a wire, and finally the majority of the lightning current flows into the soil via the two nearest towers (the characteristic impedance of the overhead line is about 200 Ω). The current parameters characteristics of the initial stage, return strokes and M-components in the case of lightning to ground and lightning to overhead line are analyzed to compare whether they differ and to analyze the reasons for the differences.
The maximum current, average current, transfer charge, and action integral of the initial stage in the case of lightning to the ground are 2.8, 2.4, 2.0, and 5.3 times those of the lightning to the overhead line. There is no significant difference in the duration of the initial stage between two conditions. The geometric mean of the rise time of the return stroke when the lightning strikes the ground is 0.25 μs, which is much smaller than 0.60 μs when the lightning strikes the overhead line. For other waveform parameters of return strokes such as the current peak, the difference is not obvious. The M-components are similar to the initial continuing current pulses, and the current peak value, transfer charge, continuing current level in the case of lightning to the overhead line are all smaller than those of the lightning to the ground. The rise time, half-peak width, and duration of the M-components are also smaller than those of the lightning to the ground, with the former being about 0.56, 0.59, and 0.40 times the latter. Analysis based on Norton current source equivalent circuit model. The reason for the difference in lightning current between the two lightning conditions is that the equivalent impedance of the lightning channel is different in each stage.

Key words： Rocket triggered lightning overhead line lightning current return stroke

Received: 11 November 2022

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	Cai Li
	Du Yiyang
	Hu Qiang
	Peng Xiangyang
	Chen Shaodong

Cite this article:

Cai Li,Du Yiyang,Hu Qiang等. Comparative Analysis of Current of Rocket-Triggered Lightning Striking the Overhead Line and the Ground[J]. Transactions of China Electrotechnical Society, 0, (): 222127-222127.

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