1. School of Electrical Engineering and Automation Hefei University of Technology Hefei China
2. State Grid Corporation of China Beijing China
3. Electric Power Research Institute State Grid Anhui Electric Power Company Hefei China
4. Department of High Voltage China Electric Power Research Institute Beijing China
5. School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China
6. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China