基于等效电路的油纸绝缘系统受潮状态分析  

Analyzing the Moisture State of Oil-Paper Insulation System Using an Equivalent Circuital Model

作　　者：杨峰 唐超[1] 周渠[1] 杜林[2] 冉鹂蔓 Yang Feng;Tang Chao;Zhou Qu;Du Lin;Ran Liman(College of Engineering and Technology Southwest University,Chongqing 400716,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044,China;State Grid Chongqing Shibei Electric Power Supply Branch,Chongqing 401147,China)

机构地区：[1]西南大学工程技术学院,重庆400716 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [3]国网重庆市北供电公司,重庆401147

出　　处：《电工技术学报》2020年第21期4586-4596,共11页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金资助(SWU119042)。

摘　　要：基于油纸绝缘的介电响应等效模型——扩展德拜模型,通过分析模型参数变化规律提取介电特征参量,从而实现对绝缘受潮状态的定量评估。首先,针对油纸电容式试验套管模型,制备不同受潮程度的电容芯子,并在不同温度下对样本芯子进行频域介电谱(FDS)测试。利用FDS实测谱图,采用GA-LMA融合优化算法辨识得出扩展德拜模型的各支路参数,并基于该模型分别研究了温度及水分含量对模型参数的影响规律,进而提取表征油纸绝缘受潮程度的特征参量-低频支路极化电阻及时间常数,最后建立上述参量与绝缘水分含量的关系式,实现了对油纸绝缘系统受潮状态的定量判断。Starting from the equivalent model of the dielectric response of oil-paper insulation—extended Debye model,the dielectric characteristic parameters are extracted by analyzing the variation patterns of the model parameters,so as to achieve the quantitative evaluation of the insulation dampness state.Firstly,oil-paper model bushings were used for the test with their condenser bodies absorbing different levels of moisture,and they were tested by frequency-domain dielectric spectroscopy(FDS)under different controlled temperatures.Using the obtained FDS spectrum and the combinational optimization algorithm GA-LMA,the branch parameters of the extended Debye model were identified.Then the characteristic parameters which characterize the moisture level of the oil-paper insulation system was proposed-the polarization resistance and the time constant of the branch that dominates the low-frequency properties of the model.Finally,the formulaic relationship between the above parameters and moisture content of insulation was established,which can be used to quantificationally determine the moisture content of oil-paper insulation.

关 键 词：油纸绝缘系统 频域介电谱 扩展德拜模型 受潮状态 特征量 

分 类 号：TM855[电气工程—高电压与绝缘技术]