Computation of eddy current losses by heavy current leads and windings in large transformers using IEM coupled with improved R- Psi method

Author

Renyuan, Tang ; Junyou, Yang ; Zhouxiong, Xu ; Feng, Lin ; Chunrong, Liu ; Zihong, Xu

Author_Institution

Shenyang Polytech. Univ., China

Volume

26

Issue

2

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

493

Lastpage

496

Abstract

A method combining the improved R- Psi method (in which the electrical vector potential R only exists in the conducting region) and the IEM (integral equation method) is described which synthesizes the advantages of the two methods and reduces the CPU time and the storage space required to solve 3-D eddy-current problems in open regions. The IEM is used to compute the magnetic field and losses due to heavy-current leads and the improved R- Psi method is used to calculate the magnetic field and losses due to windings. The coupled method is used to calculate the three-dimensional sinusoidal eddy-current field related to the open region in a 360 MVA/500 kV power transformer. The eddy current and loss computation and the estimation of the local hot spots makes it possible to prevent a large transmitter from local overheating.

Keywords

eddy current losses; integral equations; power engineering computing; power transformers; transformer windings; 360 MVA; 500 kV; CPU time; IEM; R- Psi method; electrical vector potential; heavy-current leads; integral equation method; local hot spots; local overheating; loss computation; magnetic field; power transformer; three-dimensional sinusoidal eddy-current field; transformer windings; Boundary conditions; Couplings; Eddy currents; Integral equations; Magnetic fields; Magnetic losses; Magnetization; Mesh generation; Partial response channels; Power transformers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.106361

Filename

106361