1. Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou, People’s Republic of China
2. State Grid Henan Electric Power Company, Zhengzhou, People’s Republic of China
3. State Grid Henan Skills Training Center, Zhengzhou, People’s Republic of China
4. College of Engineering and Technology, Southwest University, Chongqing, People’s Republic of China
5. HVDC Branch of Xuji Electric Co., Ltd., Xuchang, People’s Republic of China