1. Shandong Provincial Key Laboratory of UHV Transmission Technology and EquipmentSchool of Electrical EngineeringShandong UniversityJinan 250061People's Republic of China
2. State Grid Zibo Electric Power CompanyZibo 255000People's Republic of China
3. State Grid Shandong Electric Power CompanyJinan 250061People's Republic of China
4. Shanghai University of Electric PowerShanghai 200090People's Republic of China