摘要
油纸绝缘低频响应对绝缘状态受潮及老化的诊断至关重要。针对目前关于低频响应数据的分析方法较为缺乏、对应的等效电路模型还不完善的问题,利用Kramers-Kronig变换对油纸绝缘频域介电谱中的电导、无穷频率电容和弛豫过程进行分离;引入基于多体理论的Dissado-Hill模型对低频弛豫过程进行拟合,并构建一种新的油纸绝缘低频响应等效电路模型。最后,对不同含水率油纸绝缘样品的低频响应数据进行建模和参数分析。实验结果表明,利用Kramers-Kronig变换能有效的对油纸绝缘的弛豫过程、电导过程以及无穷频率电容进行解耦;不同含水率样品低频响应模型重构谱线相对于测量谱线的拟合优度在0.98以上,验证了模型的准确性;低频弥散极化率幅值χ_(LFD)(0)与微水含量之间存在指数函数关系,其拟合优度高达0.99,可作为油纸绝缘微水含量定量评估的新特征量,为油纸绝缘受潮状态诊断提供新思路。
The low frequency response of oil paper insulation is very important for the diagnosis of damp and aging of insulation.In view of the lack of analysis methods for low-frequency response data and the imperfection of the corresponding equivalent circuit model,the Kramers-Kronig transform is used to separate the conductance,infinite frequency capacitance and relaxation process in the frequency-domain dielectric spectrum of oil paper insulation.The Dissado-Hill model based on multi-body theory is introduced to fit the low-frequency relaxation process.A new oil paper insulation model is formulated,which is the equivalent circuit model of paper insulation for low frequency response.Finally,the low frequency response data of oil paper insulation samples with different moisture content are modeled and analyzed.Experimental results show that the Kramers-Kronig transform can effectively decouple the relaxation process,conductivity process and infinite frequency capacitance of oil paper insulation.The goodness of fit of reconstructed spectral lines of the low-frequency response model for samples with different moisture content is more than 0.98,which evaluateds the accuracy of the model.There is an exponential function relationship between the amplitude of low-frequency diffuse polarizabilityχ_(LFD)(0)and micro water content.The goodness of fit is as high as 0.99,which can be utilized as a new characteristic quantity for quantitative evaluation of moisture content of oil paper insulation.It provides a new idea for diagnosis of moisture affected state of oil paper insulation.
作者
邹阳
何津
金涛
Zou Yang;He Jin;Jin Tao(Cllege of Eletrical Engineering and Automation,Fuzhou Unirersity,Fuzhou 350108,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2021年第9期271-278,共8页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(51977039)
福建省自然科学基金(2019J01248)项目资助。
作者简介
邹阳,2017年于福州大学获得博士学位,现为福州大学副教授,主要研究方向为电气系统智能化故障诊断。E-mail:24001744@qq.com;通信作者:何津,2018年于福州大学获得学士学位,现为福州大学硕士研究生,主要研究方向为电力设备故障诊断与绝缘状态检测。E-mail:1025016805@qq.com。
