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).
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 es...