The 3d model of the metro transformer was built up based on the nonlinear static finite element method with edge element and the equivalent inductances between different windings were calculated by the model 为此，运用磁集成技术将平衡电抗器与变压器有机结合，构造出新型12脉波二重逆变牵引供电系统，实现利用集成磁件的等效电感取代平衡电感的设计思想。
