A Simulation and a Computational Study on the Reliability Verification of Epoxy Resin Paper-Impregnated Bushings in Power Transformers

Daijun Liu, Xiaobang Tong, Libao Liu, Xiaoying Dong, Tianming Yan, Wenkai Tang, Liming Wang, Bin Cao () and Zimin Luo ()
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Daijun Liu: China Yangtze Power Co., Ltd., Beijing 100032, China
Xiaobang Tong: Nanjing Electric High Voltage Bushing Co., Ltd., Nanjing 210046, China
Libao Liu: Nanjing Electric High Voltage Bushing Co., Ltd., Nanjing 210046, China
Xiaoying Dong: China Yangtze Power Co., Ltd., Beijing 100032, China
Tianming Yan: China Yangtze Power Co., Ltd., Beijing 100032, China
Wenkai Tang: Nanjing Electric High Voltage Bushing Co., Ltd., Nanjing 210046, China
Liming Wang: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Bin Cao: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Zimin Luo: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China

Energies, 2025, vol. 18, issue 13, 1-22

Abstract: Epoxy resin paper-impregnated bushings, as critical insulating components in power transformers, are subjected to complex electric fields, thermal fields, and mechanical stresses over extended periods. Their performance stability is directly linked to the safe operation of transformers. Given the significant costs associated with their production, reliability verification is a crucial aspect of their design and manufacturing process. This study employs the finite element simulation technology to systematically investigate the electric field distribution characteristics, thermal field distribution characteristics, and seismic performance reliability verification methods of epoxy resin paper-impregnated bushings. The simulation and calculation results indicate that for bushings with rated voltages of 40.5 kV, 72.5 kV, and 126 kV, the maximum radial electric field strengths are 1.38 kV/mm, 2.74 kV/mm, and 3.0 kV/mm, respectively, with axial electric field strengths all below allowable values. The insulation margin meets the 1.5 standard requirements. Under short-circuit conditions, the thermal stability analysis of the bushings reveals that the final conductor temperatures are all below 180 °C, indicating sufficient safety margins. All three types of bushings comply with the design requirements for an 8-degree earthquake intensity and are capable of effectively withstanding seismic loads. This research provides a theoretical foundation for the development and application of epoxy resin paper-impregnated bushings, offering a significant engineering application value in enhancing the safety and stability of transformers and power systems.

Keywords: epoxy resin; paper-impregnated bushings; electric field strength; seismic performance; thermal field analysis (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: 2025
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