A.3kV,6kV,10kV,35kV,l10kV,220kV,330kV,500kV
B.3kV,6kV,10kV,35kV,154kV,300kV,500kV
C.3kV,6kV,10kV,35kV,66kV,154kV,230kV,500kV
D.3kV,6kV,10kV,35kV,115kV,230kV,300kV,500kV