1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin, China
2. State Grid Sichuan Electric Power Company Ultra High Voltage Branch, Xichang, China
3. Tianjin Power Dongli District Supply Company, Tianjin, China
4. School of Electrical Engineering and Automation, State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China