1. School of Electrical Engineering, Chongqing University,State Key Laboratory of Power Transmission Equipment Technology,Chongqing,China,400044
2. College of Mathematics and Statistics, Chongqing University,Chongqing,China,401331
3. School of Foreign Languages and Cultures, Chongqing University,Chongqing,China,401331
4. EHV Company of State Grid Jilin Electric Power Co., Ltd., Changchun,Substation Maintenance Center,Changchun,China,130022