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Energies 2017, 10(3), 333; doi:10.3390/en10030333

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

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
China Electric Power Research Institute, Wuhan 430072, China
3
School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
4
Guangdong Electric Power Research Institute, Guangzhou 510080, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 10 January 2017 / Revised: 27 February 2017 / Accepted: 6 March 2017 / Published: 9 March 2017
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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 μs 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. View Full-Text
Keywords: ultra-high-voltage transmission line; lightning-shielding failure; electrogeometric model; striking distance; negative switching surge discharge tests of long air gaps ultra-high-voltage transmission line; lightning-shielding failure; electrogeometric model; striking distance; negative switching surge discharge tests of long air gaps
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Deng, Y.; Wang, Y.; Li, Z.; Dai, M.; Wen, X.; Lan, L.; An, Y.; E, S. Improved Electrogeometric Model Suitable for EHV and UHV Transmission Lines Developed through Breakdown Testing for Long Air Gaps. Energies 2017, 10, 333.

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