Corona Discharge and Electromagnetic Environment Degradation of Aging Transmission Lines
Corona Discharge and Electromagnetic Environment Degradation of Aging Transmission Lines
Y. Jiang1, N. Zheng2, G. Guo2, R. Zhang2, and X. Fu2
1State Grid Shandong Electric Power Research Institute, China
2Laboratory of Advanced Technology of Electrical Engineering and Energy Graduate School at Shenzhen, Tsinghua University, China
Abstract- Corona discharge and electromagnetic environment on AC long-term operated conductors are important issues for ultrahigh voltage transmission lines. In order to investigate the relation between conductor age and electromagnetic environment, including audible noise and radio noise, several groups of long-term operated conductors in Shandong province in China are selected for experiment in a corona cage. According to corona tests in corona cage, corona discharge becomes more serious as the applied voltage improves. Difference of electromagnetic environment between conductors of different operated year increases. It is found that corona discharge, accompanying audible noise and radio noise becomes more serious as the service year lengthens. When the operated years are close, the general environment along the transmission lines plays an important role in electromagnetic environment degradation.
Keywords-Corona discharge, electromagnetic environment, transmission line, aging, pollution severity class