Corona onset voltage gradient of bundle conductors for EHV/UHV AC power lines in corona cages considering the altitude correction

The corona onset voltage gradient (COG) of conductors is a key parameter in the design of overhead transmission lines. The commonly used semi-empirical calculation formula proposed by Peek (1910s) at present can roughly estimate the COG of single conductors and is not applicable to large cross-secti...

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Published inCSEE Journal of Power and Energy Systems Vol. 6; no. 3; pp. 693 - 703
Main Authors Huang, Shilong, Liu, Yunpeng, Chen, Shaoshuai, Liu, Daran, He, Wangling, Wan, Baoquan
Format Journal Article
LanguageEnglish
Published Beijing Chinese Society for Electrical Engineering Journal of Power and Energy Systems 01.09.2020
China electric power research institute
Subjects
Altitude
Bundle conductors
Bundling
Conductors
Cross-sections
Design parameters
Electric potential
Electricity
Mathematical analysis
Power lines
Sea level
Transmission lines
Voltage
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ISSN2096-0042
2096-0042
DOI10.17775/CSEEJPES.2018.00810

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Summary:The corona onset voltage gradient (COG) of conductors is a key parameter in the design of overhead transmission lines. The commonly used semi-empirical calculation formula proposed by Peek (1910s) at present can roughly estimate the COG of single conductors and is not applicable to large cross-section bundle conductors. In this paper, experiments are conducted to investigate the corona characteristics of a whole series of bundle conductors at different altitudes, and a prediction formula is proposed for the COG of large cross-section bundle conductors on AC transmission lines considering the altitude correction. The calculated values using the proposed prediction formula are compared with the experimental values of the COG in two cases: UHV eight-bundle conductors at an altitude of 19 m; 500 kV UHV four-bundle conductors in Wuhan, Xining, Geermu, and Nachitai at four different altitudes. The results show that the use of the formula can predict the COG of bundle conductors with the radius of 1.34 cm to 1.995 cm and the number of sub-conductors of 4 to 12 at altitudes of 19 m to 4000 m above the mean sea level. The research findings can provide a reference for the design of EHV and UHV overhead transmission lines and even those in higher voltage levels.
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ISSN:2096-0042
2096-0042
DOI:10.17775/CSEEJPES.2018.00810