三相5柱变压器
transformer of three phases and five columnes
三相三柱变压器
three-phase transformer with three legs
three-phase three-limb transformer
环形自动调压变压器
ring auto regulating transformer
全星形变压器
whole-star-connected transformers
小型环形变压器
Small-sized Ring Transformer
小型环形变压器的修复
Repair of the Small-sized Ring Transformer
变频升压变压器
step-up transformer with variable frequency
变压器变换
transformer transformation