油纸绝缘老化程度与电荷运动频域参量的定量关系  

Quantitative Relationship Between Aging Degree of Oil-paper and Its Charge Motion Parameters in Frequency Domain

作　　者：谢佳成[1] 董明[1] 徐广昊 胡一卓 杨凯歌 李金忠 XIE Jiacheng;DONG Ming;XU Guanghao;HU Yizhuo;YANG Kaige;LI Jinzhong(State Key Lab of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2021年第5期2033-2041,共9页Power System Technology

基　　金：国家自然科学基金项目(U1866603,51877171)。

摘　　要：为充分理解频域介电谱法的微观机制,并通过其相关物理参量对油纸绝缘实施老化评估,首先基于电介质物理中的相关理论,深入分析了交变电场下材料宏观介电响应曲线与其内部微观电荷运动规律的对应关系,建立了综合利用复介电常数实部和虚部的频谱分解方法,以实现宽频带内不同类型电荷运动独立谱线的有效分离。在此基础上,通过对不同老化程度油纸绝缘样品实测介电响应曲线进行频谱分解,观察了微观电导和极化过程独立频谱曲线随材料老化程度加深呈现的变化规律,进而提取了具有明确物理含义的特征参量,以实现油纸绝缘老化程度的定量评估。最后拟合了特征参量与聚合度的函数方程,并通过实验数据对拟合方程的可靠性进行验证。In order to fully understand the micromechanism of the frequency domain dielectric spectroscopy and to carry out effective aging evaluation for the oil-paper insulation through related physical parameters,based on related theories in Dielectric Physics,the present study expounds the corresponding relationship between the frequency domain spectroscopy and material’s inner micro charge motion law under the alternating electric field.We propose the spectrum decomposition method which comprehensively considers the real and imaginary parts of the complex permittivity and effectively separate the different charge motion processes reflected by the dielectric response curve in the wide frequency band.Further,by measuring the dielectric response curves of a series of oil paper insulation samples with different aging degrees,the above method effectively reveals the change law of dielectric processes such as charge conductivity and polarization with the aging of the materials.Then we obtain the characteristic parameters with specific physical meanings to realize the quantitative aging evaluation.At the end of the paper,the function models of characteristic parameters and material’s degree of polymerization are fitted,and the relevant experiment verifies the proposed method.

关 键 词：油纸绝缘 介电响应 弛豫极化 聚合度 老化评估 

分 类 号：TM85[电气工程—高电压与绝缘技术]