1. School of Electrical Engineering, Shanghai University of Electric Power, Shanghai, China
2. Department of Electrical Engineering, State Key Laboratory of Power Systems, Tsinghua University, Beijing, China
3. College of Electrical Engineering, Southwest Jiaotong University, Chengdu, China
4. Shandong Taikai Electrical Insulation Company Ltd., Taian, Shandong, China
5. Maintenance and Test Center of EHV Power Transmission, China Southern Power Grid, Guangzhou, China
6. State Grid Shanghai Municipal Electric Power Company, Shanghai, China
7. Shenzhen Power Supply Company Ltd., Shenzhen, Guangdong, China
8. Department of Electrical, Electronic and Information Engineering, University of Bologna, Bologna, Italy