1. State Grid Cangzhou Electric Supply Company, Hebei, Cangzhou, China
2. State Key Laboratory of Advanced Power Transmission Technology, State Grid Smart Grid Research Institute Company Ltd., Beijing, China
3. Qingdao Yunlu Advanced Materials Technology Company Ltd., Shandong, Qingdao, China
4. Hebei Gaojing Electrical Equipment Company Ltd., Hebei, Handan, China
5. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, China