1. Shandong Electrical Engineering & Equipment Group Digtal Technology Co., Ltd.,Jinan,China
2. China Electrical Equipment Group Co.,Ltd.,Shanghai,China
3. State Grid Shandong Electric Extrahigh Voltage Company,Jinan,China
4. State Grid Jilin Electric Power Co., Ltd.,Baicheng Power Supply Company,Baicheng,China
5. State Grid Yishui Power Supply Company,Linyi,China