A.10/0.4kV B.10±5%/0.4kV C.10±2×2.5%/0.4kV D.10±4×1.25%/0.4kV
A.Yy0 B.Yd C.Dy0 D.Dd
A.4%,28kV B.4.5%,28kV C.6%,35kV D.8%,35kV