Asymmetrical DC bias analysis of the no‐load series transformer by using the TPFEM. Issue 2 (1st February 2017)

• Record Type: Journal Article
• Authors: Wang, Shuaibing; Li, Lin; Zhao, Xiaojun; Xie, Yuqing; Cai, Linhai
• Is Part Of: IET electric power applications. Volume 11:Issue 2(2017)
• Page Start: 169
• Page End: 177
• Publication Date: 2017-02-01
• Subjects: finite element analysis -- power transformers; asymmetrical DC bias analysis -- no‐load series transformer -- TPFEM -- time‐periodic finite element method -- asymmetrical DC bias problems -- two‐dimensional magnetic system -- field–circuit coupled time‐periodic finite element equations -- magnetic field energy -- convergent fixed‐point method -- nonlinear timevarying equations -- DC bias calculation; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2016.0172
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : The time‐periodic finite element method (TPFEM) is coupled with circuit equations to study the asymmetrical DC bias problems of series transformer in this study. The periodic characteristics of the current and the magnetic field are taken as the restraint conditions. Taking into account the external voltages and determining the equivalent thickness of the two‐dimensional magnetic system by calculating the magnetic field energy, the field–circuit coupled time‐periodic finite element equations are built. The locally convergent fixed‐point method is used to solve the non‐linear time‐varying equations by updating the fixed reluctivity. The calculated results agree well with those measured on a no‐load low‐voltage series transformer prototype under asymmetrical DC bias, which verifies the effectiveness of TPFEM in the DC bias calculation. The characteristics of the no‐load series transformer prototype under asymmetrical DC bias are analysed based on this method.