Journal of Shandong University(Engineering Science) ›› 2026, Vol. 56 ›› Issue (1): 158-168.doi: 10.6040/j.issn.1672-3961.0.2024.174

• Electrical Engineering • Previous Articles    

Research on localized moisture of transformer oil paper insulation based on hybrid equivalent circuit

LIN Zhiyong1,2, PENG Mingcheng1,2, DENG Dongping3, LI Ronghua1,2, HUANG Guotai4   

  1. LIN Zhiyong1, 2, PENG Mingcheng1, 2, DENG Dongping3, LI Ronghua1, 2, HUANG Guotai4(1. College of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, Fujian, China;
    2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen University of Technology, Xiamen 361024, Fujian, China;
    3. State Grid Zhangping Electric Power Supply Company, Zhangping 364400, Fujian, China;
    4. Fujian Provincial Electric Power Materials Co., Ltd., Fuzhou 350003, Fujian, China
  • Published:2026-02-03

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Abstract: Considered the limitations of existing extended Debye equivalent circuit in polarization research of transformer oil paper insulation interface, this paper built a hybrid equivalent circuit model, combined with particle swarm optimization algorithm for equivalent circuit parameter identification, and constructed a hybrid equivalent circuit that accurately reflected transformer insulation aging. The paper analyzed the influence of variation of middle time constant branch parameters in the equivalent circuit of the hybrid model and the extended Debye model on the return voltage polarization spectrum. Furthermore, the relationship between the hybrid branch and the dampening mechanism of oil-paper insulation in the transformer was studied. The results indicated that:compared with the extended Debye equivalent circuit, the hybrid equivalent circuit was more effective in characterizing the interface polarization characteristics of oil-paper, and the hybrid equivalent circuit could more effectively reflected the local peak of the recovery voltage polarization spectrum caused by local moisture of the transformer. Moreover, the average time constant of the hybrid branch had a good functional relationship with the sub-time constant of return voltage polarization spectrum, which was an effective way to studied local dampness of transformer insulation, and it could provide a new idea for the research on the local dampness of transformer insulation.

Key words: hybrid circuit, recovery voltage, main time constant, local peak, local dampness

CLC Number: 

  • TM411
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[1] Zhiyong LIN,Damin ZHANG,Xungao ZHONG,Jianbin ZENG,Qiang ZHANG. Analysis of insulation state of transformer based on aging factor [J]. Journal of Shandong University(Engineering Science), 2019, 49(1): 114-119.
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