1. State Grid Zhejiang Electric, Power Co., Ltd,Huzhou Electric Power Supply Company,Huzhou,China
2. State Grid Zhejiang Electric, Power Co., Ltd,Electric Power Research Institute,Hangzhou,China
3. Xi' an Jiaotong University,State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an,China
4. Xi’an Jiaotong University,Electrical Insulation and Power Equipment,Xi’an,China