Improved Electrogeometric Model Suitable for EHV and UHV Transmission Lines Developed through Breakdown Testing for Long Air Gaps

Yeqiang Deng, Yu Wang, Zhijun Li, Min Dai, Xishan Wen, Lei Lan, Yunzhu An and Shenglong E
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Yeqiang Deng: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Yu Wang: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Zhijun Li: China Electric Power Research Institute, Wuhan 430072, China
Min Dai: China Electric Power Research Institute, Wuhan 430072, China
Xishan Wen: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Lei Lan: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Yunzhu An: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Shenglong E: Guangdong Electric Power Research Institute, Guangzhou 510080, China

Energies, 2017, vol. 10, issue 3, 1-14

Abstract: As a type of engineering model used for solving lightning-shielding problems, the electrogeometric model has been widely used for assessing lightning-shielding failure in high-voltage and extra-high-voltage transmission lines. However, with the increase of voltage levels in ultra-high-voltage lines and the growth of the air gap, the results previously yielded by the electrogeometric model are no longer consistent with those observed. Therefore, this study corrected the equation for the relationship between lightning current and striking distance, by using data on a negative polarity 50% discharge voltage from the rod-rod gap ?20/2500 ?s switching impulse test wherein an air gap of up to 10 m was first tested. Subsequently, the return stroke velocity distribution observed by Idone was newly applied. In addition, the correction factor for the ground was corrected in this study. Thus, an improved electrogeometric model for application in EHV and UHV transmission lines is proposed in this paper. By employing the improved electrogeometric model to calculate the frequency of lightning strikes of 500 and 1000 kV transmission lines in Japan and a 1000 kV transmission line in China, we found that the results calculated using the improved electrogeometric model were closer to the actual observations in Japan than was the original electrogeometric model. The improved electrogeometric model provides a more reliable foundation for lightning-shielding design of extra-high-voltage and ultra-high-voltage transmission lines.

Keywords: ultra-high-voltage transmission line; lightning-shielding failure; electrogeometric model; striking distance; negative switching surge discharge tests of long air gaps (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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