Corona Onset Voltage Gradient of Bundle Conductors for EHV/UHV AC Power Lines in Corona Cages Considering Altitude Correction  

作　　者：Shilong Huang Yunpeng Liu Shaoshuai Chen Daran Liu Wangling He Baoquan Wan 

机构地区：[1]School of Electrical Engineering,North China Electric Power University,Baoding 071003,China [2]School of Electrical Engineering,Wuhan University,Wuhan 430072,China [3]China Electric Power Research Institute,Beijing 10092,China

出　　处：《CSEE Journal of Power and Energy Systems》2020年第3期693-703,共11页中国电机工程学会电力与能源系统学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(51577069,51277073);National Basic Research Programme of China(2011CB209401);the Science and Technology Project of State Grid Corporation of China(SGTYHT/15-JS-191);the Science and Technology Program of EPPEI(K201909-D);the Fundamental Research Funds for the Central Universities(2020MS092).

摘　　要：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 subconductors 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.

关 键 词：Bundle conductor corona onset voltage gradient EHV and UHV transmission lines prediction formula 

分 类 号：TM744[电气工程—电力系统及自动化]