1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology,Wuhan,China
2. Hong Kong Polytechnic University,Department of Building Environment and Energy Engineering,Hong Kong,China
3. State Key Laboratory of HVDC, Electric Power Research Institute, CSG,Guangzhou,China
4. Maintenance and Test Center of Extra High Voltage Power Transmission Company of China Southern Power Grid,Guangzhou,China