Affiliations: [a] Department of Electrical Engineering, Dong-A
University, Pusan, Korea | [b] R&D Center, Power and Industrial Systems
Performance Group, Hyosung Corporation, Changwon, Korea | [c] Power Apparatus Research Center, HVDC Research
Division, Korea Electrotechnology Research Institute, Changwon, Korea | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Sung-Chin Hahn, Department of Electrical
Engineering, Dong-A University, Pusan 604-714, Korea. E-mail:
schahn@dau.ac.kr
Abstract: In general, a lot of computing time is needed to analyze the
transient characteristics of a power transformer with complex geometry by
field-circuit coupling method. This paper proposed a modified 2-D model and an
efficient field-circuit coupling technique of a power transformer in order to
reduce the computing time. To analyze the transient electromagnetic force
acting on each disk of transformer windings, we made 2-D axisymmetric model.
First, the transient current equation considering the residual flux was solved
to get the inrush current. Next, the transient electromagnetic force due to the
inrush current is obtained by applying finite element method (F.E.M.) to the
modified 2-D model. The proposed method will be useful for the structure design
of the power transformers.
Keywords: Finite element analysis, inrush current, resultant force, transient electromagnetic force
