基于混联等效电路的变压器油纸绝缘局部受潮研究

doi:10.6040/j.issn.1672-3961.0.2024.174

摘要/Abstract

摘要： 针对现有扩展德拜等效电路在变压器油纸绝缘界面极化研究中的局限性,本研究应用混联极化支路构建混联等效电路模型,结合粒子群算法进行等效电路参数辨识,构建准确反映变压器绝缘老化的混联等效电路。仿真分析混联模型与扩展德拜模型等效电路中时间常数支路参数变化对回复电压极化谱的影响规律,研究混联支路与变压器油纸绝缘受潮机理的内在联系。研究结果表明:混联等效电路比扩展德拜等效电路能更加有效表征油纸界面极化特性和因变压器局部受潮而产生的回复电压极化谱局部波峰,而且混联支路平均时间常数与回复电压极化谱次时间常数具有良好的函数关系式,是研究变压器绝缘局部受潮的有效途径,为变压器油纸绝缘局部受潮研究提供新思路。

关键词: 混联电路, 回复电压, 主时间常数, 局部波峰, 局部受潮

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

中图分类号:

TM411

林智勇,彭铭珵,邓东平,李荣华,黄国泰. 基于混联等效电路的变压器油纸绝缘局部受潮研究[J]. 山东大学学报 (工学版), 2026, 56(1): 158-168.

LIN Zhiyong, PENG Mingcheng, DENG Dongping, LI Ronghua, HUANG Guotai. Research on localized moisture of transformer oil paper insulation based on hybrid equivalent circuit[J]. Journal of Shandong University(Engineering Science), 2026, 56(1): 158-168.

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