[1] State Grid Hunan Elect Power Co Ltd, State Grid Hunan Elect Power Co Ltd Res Inst, Changsha, Hunan, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan, Hubei, Peoples R China