1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing, China
2. Maintenance Branch Company of East Inner Mongolia Electric Power Company Limited, Tongliao, China
3. Tongliao Electric Power Supply Bureau, Tongliao, China
4. Chengdu Electric Power Supply Bureau, Chengdu, Sichuan, China