Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

Bingbing Dong, Yu Gu, Changsheng Gao, Zhu Zhang, Tao Wen and Kejie Li
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Bingbing Dong: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Yu Gu: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Changsheng Gao: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Zhu Zhang: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Tao Wen: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Kejie Li: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China

Energies, 2021, vol. 14, issue 6, 1-13

Abstract: In recent years, the new type design of current transformer with bushing structure has been widely used in the distribution network system due to its advantages of miniaturization, high mechanical strength, maintenance-free, safety and environmental protection. The internal temperature field distribution is an important characteristic parameter to characterize the thermal insulation and aging performance of the transformer, and the internal temperature field distribution is mainly derived from the joule heat generated by the primary side guide rod after flowing through the current. Since the electric environment is a transient field and the thermal environment changes slowly with time as a steady field under the actual conditions, it is more complex and necessary to study the electrothermal coupling field of current transformer (CT). In this paper, a 3D simulation model of a new type design of current transformer for distribution network based on electric-thermal coupling is established by using finite element method (FEM) software. Considering that the actual thermal conduction process of CT is mainly by conduction, convection and radiation, three different kinds of boundary conditions such as solid heat transfer boundary condition, heat convection boundary condition and surface radiation boundary condition are applied to the CT. Through the model created above, the temperature rise process and the distribution characteristics of temperature gradient of the inner conductor under different current, different ambient temperatures and different core diameters conditions are studied. Meanwhile, the hottest temperature and the maximum temperature gradient difference are calculated. According to this, the position of weak insulation of the transformer is determined. The research results can provide a reference for the factory production of new type design of current transformer.

Keywords: current transformer; finite element analysis; electro-thermal coupling; thermal field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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