油纸绝缘局部放电脉冲参数统计分析与老化状态诊断技术  

Statistical Analysis of Pulse Parameters and Diagnose of Aging State Based on Partial Discharge in Paper-oil Insulation

作　　者：李金忠[1,2] 张乔根[1] 李原[1] 文韬[1] 郭锐[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]中国电力科学研究院,北京100192

出　　处：《高电压技术》2015年第11期3821-3829,共9页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011209405)~~

摘　　要：不同老化程度下油纸绝缘中的局部放电会由于材料特性的不同而表现出不同特征。鉴于此,在实验室搭建了抗干扰能力强的局部放电测量系统,制作了6种具有不同老化程度的纸板内部缺陷模型试品。通过对不同试品局部放电单个脉冲波形的测量,以期获得可表征油纸绝缘劣化程度的局部放电脉冲参数统计特征。研究发现:虽然油纸绝缘局部放电强度具有很大的随机性,但随着油纸绝缘老化程度的增加,局部放电脉冲的上升时间减小,而且半高宽降低,局部放电脉冲频率增加特别是脉冲上升时间与油纸绝缘老化关系明显;该现象可用于判断纸板的老化状态。研究结果为油纸绝缘老化状态的评估提供了一种新的判别方法。The partial discharges （PDs） in paper-oil insulation with different aging degrees show various features ac- cording to the variation in material behaviors. Hence, we established a PD measurement system with strong anti-interference capability in laboratory, prepared internal defect models of paper-oil with six different aging degrees, and measured of single PD pulses of the models in order to obtain statistical features of PD pulse parameters that can indicate the degradation level of oil-impregnated paper. The results show that, despite the obvious randomness of the PD intensity, both the rise time of PD pulses and the full width at the half maximum decrease with the increase of aging degree. This pattern can be used to determine the aging degrees of pressboards. The results can be taken as a new approach for deter- mining the aging degree of paper-oil insulation.

关 键 词：油纸绝缘 局部放电 噪声抑制 缺陷模型 脉冲波形参数 绝缘老化 

分 类 号：TM41[电气工程—电器]