NDLI: Study of DC bias of power transformer based on UMEC model

Content Provider	IEEE Xplore Digital Library
Author	Liu Qing Zhang Shihe Su Shuai
Copyright Year	2015
Description	Author affiliation: Dept. of Electr. & Control Eng., Xi'an Univ. of Sci. & Technol., Xi'an, China (Zhang Shihe; Su Shuai) \|\| State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xi'an, China (Liu Qing)
Abstract	DC bias of power transformer can lead to distortion of excitation current, reactive power increasing and winding overheating, which will seriously affecting the safe operation of the power grid. To study DC bias is of great significance on the safe operation of transformer. Based on the Unified Magnetic Equivalent Circuit (UMEC) model of transformer, the excitation current and its harmonic when DC bias occurs had been analyzed by using PSCAD in this paper. The tolerance abilities of transformers with different structures under DC bias have been compared. With finite element software of Maxwell 2D, the model of transient electromagnetic field of single-phase transformer had been established to analyze the internal magnetic field variations in core and yoke under different DC currents. It can be seen that the leakage flux gradually increased with the saturation of the core, which lead to the increase of eddy-current loss. The highest temperature appeared in the junction of yoke and core. The influence of the transformer DC bias on the single-phase transformers is the most severe, and the least severe on 3-phase 3-limb transformers.
Starting Page	65
Ending Page	68
File Size	1421498
Page Count	4
File Format	PDF
ISBN	9781467394444
e-ISBN	9781467394451
DOI	10.1109/CEEM.2015.7368629
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-11-04
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic cores Lead Magnetic fields Saturation magnetization finite element analysis component Transformer DC bias Unified Magnetic Equivalent Circuit model
Content Type	Text
Resource Type	Article

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