1. State Grid Shandong Electric Power Company,Ministry of Construction,Jinan,Shandong
2. Second Power Transformation Company, Shandong Power Transmission and Transformation Engineering Co., Ltd,Jinan,China
3. Zhejiang Power Transmission and Transformation Engineering Co., Ltd,Substation Maintenance Branch,Hangzhou,China
4. State Grid Shandong Electric Power Company,Marketing Service Center,Jinan,China