| 1. | Principally , when the winding - connection scheme is adopted to add a set of auxiliary windings on the two - phase side of a balance transformer , we can get a three - phase to four - phase transformer 原则上,在平衡变压器的两相侧采用增加一套副绕组的双重接线方案,便可得到三相变四相电力变压器。 |