1. School of Electrical and Automation Engineering, Hefei University of Technology, Hefei, China
2. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou, China
3. Laboratory of Advanced Technology of Electrical Engineering and Energy, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China
4. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, China