NDLI: 3-D Coupled Electromagnetic-Fluid-Thermal Analysis of Oil-Immersed Triangular Wound Core Transformer

Content Provider	IEEE Xplore Digital Library
Author	Caibo Liao Jiangjun Ruan Chao Liu Wu Wen Zhiye Du
Copyright Year	1965
Abstract	This paper presents a 3-D coupled electromagnetic-fluid-thermal analysis method for temperature rise prediction in oil-immersed triangular wound core transformer. The temperatures rising inside the transformer are mainly determined by the heat sources and the heat convection effect of the transformer oil. The heat sources which include the electric power losses of transformer core, high-voltage windings, and low-voltage windings can be investigated by electromagnetic analysis using the finite element method in no-load and rated load running situations, respectively. Then, the calculation results of electric power losses are brought into the fluid-thermal field analysis as the heat sources. The temperature distribution inside the transformer and the velocity of transformer oil are analyzed by the finite volume method in the fluid-thermal field. To improve the accuracy of calculation results, the influence of temperature on the electric power losses and the parameters of transformer oil are considered in this paper. Using iterative computations, the power losses of windings are updated in accordance with the thermal field calculation result until the maximum difference of temperature between two adjacent steps is less than 0.01 K. At the end of this paper, the simulation results of coupled analysis used in the 10 kV oil-immersed triangular wound core transformer are compared with analytical formula results proposed by the International Electrotechnical Commission standard, and the good agreement of hot-spot temperature indicates the validity of coupled analysis.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	1194834
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oil insulation Transformer cores Windings Heating Temperature distribution Thermal analysis triangular wound core transformer Coupled problem electromagnetic field analysis fluid-thermal field analysis temperature rise
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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