Electric Circuit and Magnetic Circuit Combined Model of Three-Phase Three-Legged Transformer under DC Bias

  • Xia DongEmail author
  • Zhizhen Liu
  • Linlin Sun
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 134)


An electric circuit and magnetic circuit coupled model of the DC biased three-phase three-legged transformer was built. In the model, the magnetic circuit was set up by a practical PSPICE model with accurate performance for the three-phase three-legged saturated transformer. Meanwhile, the electric circuit equation under DC bias was built. Then, two matrix equations were formed. The matrix equations are dispersed and solved by iterative method. The waveform of the flux and exciting current for the three-phase three-legged transformer were gained in MATLAB. The simulation results show that DC current will lead to the flux and exciting current bias, but could not make the flux and exciting current distort. And the exciting current of the three-phase three-legged transformer is smaller than that of the single-phase transformer with the same rated power because of the magnetic coupling among three legs.


three-phase three-legged transformer DC bias exciting current magnetic circuit 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.School of Electrical EngineeringShandong UniversityJinanP.R. China
  2. 2.Shandong Urban Construction Vocational CollegeJinanP.R. China
  3. 3.Huaneng Liaocheng Thermal Power CO.LTDLiaochengP.R. China

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