1. Electric Power Research Institute of EHV Transmission Company of China Southern Power Grid Co., Ltd.,Guangzhou,China
2. EHV Transmission Company of China Southern Power Grid Co., Ltd.,Guangzhou,China
3. Guiyang Bureau of EHV Transmission Company of China Southern Power Grid Co., Ltd.,Guiyang,China
4. Shanghai Jiao Tong University,Department of Electrical Engineering,Shanghai,China