Affiliations: [a] Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding, Hebei, China | [b] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China
Correspondence:
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Corresponding author: Gang Liu, Department of Electrical Engineering, North China Electric Power University, Baoding, Hebei, China. Tel.: +86 312 7522854; E-mail: liugang@ncepu.edu.cn.
Abstract: In order to investigate the impacts of the non-uniform temperature on the electric field distribution under PR (polarity reversal) voltage, the core loss and windings loss of a ± 500 kV converter transformer are calculated based on the electromagnetic theory firstly. Then the 2D fluid-thermal model of the converter transformer is adopted, and the temperature distribution under normal condition is obtained by utilizing the CFD software of Fluent. Afterward, the thermal data obtained from the mesh for computation of fluid-thermal field is mapped to the mesh for computation of electric field based on interpolation, and finally the transient electric field distributions under different PR voltages are computed by the time stepping finite element method. The comparisons of the electric field distributions under different PR voltages at uniform and non-uniform temperature are conducted, which provides a reference for insulation design and fault analysis of the converter transformer.
Keywords: Converter transformer, fluid-thermal, non-uniform temperature, polarity reversal, electric field
