1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Tianjin, People’s Republic of China
2. School of Electrical Engineering, Hebei University of Technology, Tianjin, People’s Republic of China
3. School of Mechanical Engineering, Hebei University of Technology, Tianjin, People’s Republic of China
4. CETC No. 54 Research Institute, Shijiazhuang, People’s Republic of China