In order to simulate the surrounding electromagnetic field of lightning return stroke channel on overhead line, firstly, the characteristics of the surrounding electromagnetic field of lightning return stroke channel were analyzed by using the modified transmission line model with exponential current decay with height. And then the lightning induced over-voltage of the overhead line was calculated by using the procedure based on Agrawal field line coupling model. Moreover, the accuracy of the program was verified by comparison between its calculation results and the practical experimental results, the calculation results were close to the experimental data. The calculation results showed that, the vertical and horizontal components of the electric field were both to be taken into account in the coupling mechanism. The peak value and the maximum front steepness of the induced voltages were affected by the peak value and the maximum time derivative of the channel-base current, while the amplitude of the induced overvoltage was only affected by the current amplitude. At close distance from the lightning channel (as 50 m), the lightning induced over-voltage of the overhead line was inversely related to the return stroke velocity. With the increase of the observation distance, the maximum time derivative of the lightning induced over-voltage was increased, but the peak value decreased. In addition, the induced voltage would increase with increasing height of the overhead line and also increase with increasing the grounding impedance, and the induced voltage was unrelated to the cable length and diameter changes.
LIU Xiaodong
,
ZHANG Qilin
,
FENG Xuyu
,
YANG Xinpei
,
LIU Jiao
,
LI Chen
. Numerical Calculation of Lightning Return Stroke Electromagnetic Field Coupling Voltages on Overhead Line[J]. Plateau Meteorology, 2014
, 33(4)
: 1146
-1153
.
DOI: 10.7522/j.issn.1000-0534.2013.00089
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