1. Beijing Jiaotong University,School of Electrical Engineering,Beijing,China
2. National Energy Group,Shuohuang Railway Development Co., LTD,City,Country
3. OCS Research Institute China Academy of Railway Sciences Group Co., Ltd,Beijing,China
4. State Grid Liaoning Electric Power Supply Co., Ltd.,Jinzhou Operation and Maintenance Division of Extra High Voltage Branch,Shenyang,China