1. State Grid Tianjin Electric Power Research Institute, State Grid Tianjin Electric Power Company,Tianjin,China
2. Zibo Power Supply Company, State Grid Shandong Electric Power Co., Ltd.,Zibo,China
3. Nanjing Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd.,Nanjing,China
4. State Grid Tianjin Electric Power Company,High Voltage Branch,Tianjin,China
5. Weihai Power Supply Company, State Grid Shandong Electric Power Co., Ltd.,Weihai,China
6. Shandong Taikai Electrical Insulation Co., Ltd.,Tai'an,China,271000
7. School of Electrical and Information Engineering, Tianjin University,Tianjin,China