基于等值老化容抗的变压器油纸绝缘状态评估  

Evaluation of the oil-paper insulation state of a transformer based on equivalent aging capacitance

作　　者：林智勇 苏若杭 黄国泰 李荣华 张达敏 LIN Zhiyong;SU Ruohang;HUANG Guotai;LI Ronghua;ZHANG Damin(School of Electrical Engineering and Automation,Xiamen University of Technology,Xiamen 361024,China;Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control,Xiamen 361024,China;Fujian Electric Power Supplies Limited,Fuzhou 350003,China)

机构地区：[1]厦门理工学院电气工程与自动化学院,福建厦门361024 [2]厦门市高端电力装备及智能控制重点实验室,福建厦门361024 [3]福建省电力物资有限公司,福建福州350003

出　　处：《电力系统保护与控制》2025年第3期140-147,共8页Power System Protection and Control

基　　金：国家自然科学基金青年基金项目资助(51407151);福建省自然科学基金项目资助(2020J01281);福建省中青年教师教育科研项目资助(JZ230048)。

摘　　要：针对频域介电谱特征量难以定量分析变压器油纸绝缘老化状态的问题,提出应用等值老化容抗定量分析油纸绝缘老化状态的评估方法。首先,采用回复电压特征量构建变压器绝缘系统等效电路。然后,分析扩展德拜等效电路参数与频域介电谱的内在联系,研究时-频域介电谱相互转化的可行性。最后,通过仿真分析等效电路参数变化对复电容实部谱线的影响规律,定量分析等值老化容抗与主时间常数的关系。研究结果表明:等值老化容抗与主时间常数具有指数函数关系,当等值老化容抗越小时,变压器油纸绝缘老化越严重。由主时间常数与变压器绝缘老化状态关系可划分不同的变压器绝缘状态所对应的等值老化容抗范围,为准确评估变压器油纸绝缘老化状态提供新的参考依据。To address the difficulty in quantitatively analyzing the aging state of transformer oil-paper insulation using frequency domain spectroscopy characteristics,an evaluation method is proposed for analyzing the aging state of oil-paper insulation by equivalent aging capacitance.Firstly,the equivalent circuit of a transformer insulation system is constructed using recovery voltage characteristics.Then,the intrinsic relationship between the parameters of the extended Debye equivalent circuit and the frequency domain spectroscopy is analyzed,and the feasibility of time-frequency domain spectroscopy spectrum interconversion is studied.Finally,through simulation analysis,the influence of changes in equivalent circuit parameters on the real part of a complex capacitance spectrum is examined,and the relationship between equivalent aging capacitance and the main time constant is quantitatively analyzed.The results indicate that there is an exponential relationship between the equivalent aging capacitance and main time constant;the smaller the equivalent aging capacitance,the more severe the aging state of transformer oil-paper insulation.From the relationship between the main time constant and the aging state of the transformer oil-paper insulation,the equivalent aging capacitance range corresponding to different transformer insulation states can be determined,providing a new reference for accurately evaluating the aging state of transformer oil-paper insulation.

关 键 词：等效电路 频域介电谱法 主时间常数 等值老化容抗 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM411