油纸绝缘弛豫法谱线特征量提取及老化诊断  

Relaxation spectrum characteristic parameters extraction and aging diagnosis for oil-paper insulation

作　　者：刘庆珍[1] 张晓燕 蔡金锭[1] LIU Qing-zhen;ZHANG Xiao-yan;CAI Jin-ding(Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学福建省新能源发电与电能变换重点实验室,福州350108

出　　处：《电机与控制学报》2020年第5期124-134,共11页Electric Machines and Control

基　　金：国家自然科学基金(61174117)。

摘　　要：针对时域介电响应法的弛豫响应参数求解的不确定性及特征量提取不够直接、物理意义不易描述等问题,提出基于直接确定性参数辨识与弛豫法谱线特征量的变压器油、纸绝缘老化诊断新方法。首先,采用末端双点解析法确定去极化电流谱线中的弛豫参量;分别绘制表征变压器绝缘油、绝缘纸状态的弛豫最小、最大法谱线,直接提取4个新特征量:弛豫最小法向角θτmin、弛豫最小法线长Pτmin、弛豫最大法向角θτmax、弛豫最大法线长Pτmax;经研究分析证实:绝缘油老化程度越严重,θτmin越小,Pτmin越短;绝缘纸老化程度越严重,θτmax越小,Pτmax越短。多台变压器试验验证:依据新特征量能有效诊断出油、纸绝缘老化状态;弛豫参量辨识新方法和新特征量提取为油纸绝缘老化诊断提供了新思路。Aiming at the problem of uncertainty in parameter solution of relaxation response,the indirect extraction of feature quantities and the difficultly in describing physical meaning in the relaxation response parameters extraction for the time domain dielectric response method,a method for diagnosing the aging state of transformer insulating paper and insulating oil based on direct deterministic parameter identification and characteristic parameters extraction was proposed.Firstly,a terminal two-point analytical method was used to determine the relaxation parameter in the depolarization current spectrum.The relaxation minimum spectrum and maximum spectral spectrum which characterize the state of transformer insulating oil and insulating paper were drawn separately,and four new feature quantities were directly extracted:relaxation minimum normal angleθτmin,relaxation minimum normal length Pτmin,relaxation maximum normal angleθτmax,relaxation The maximum normal length Pτmax.It has been confirmed by research and analysis that the more severe the aging of insulating oil is,the smaller theθτmin and shorter the Pτmin,the more severe the aging of insulating paper,the smaller theθτmax and shorter the Pτmax.Test verification of multiple transformers:according to the new feature quantity,the aging state of oil and paper insulation can be effectively diagnosed;the new method of relaxation parameter identification and new feature quantity extraction provide a new idea for oil-paper insulation aging diagnosis.

关 键 词：去极化电流谱 末端双点解析 弛豫法谱线 弛豫法向角 弛豫法线长 油纸绝缘老化诊断 

分 类 号：TM855[电气工程—高电压与绝缘技术]