Package No. 5.3: Construction And Installation Of Transformer Stations: West Hanoi 500Kv Substation, Hiep Hoa 500Kv Substation, Phu Binh 220Kv Substation, Yen Thuy 220Kv Substation, Ba Thien 220Kv Substation, Phu Tho 2 220Kv Substation