1. Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Department of Polymer Science and Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
2. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200437, People’s Republic of China