基于极化/去极化电量差的油浸绝缘纸电导率计算方法  

Study on conductivity calculation of transformer insulation paper based on polarization/depolarization charge difference method

作　　者：张涛[1,2] 周远化[1,3] 杨文雁 钟婷婷[1,2] ZHANG Tao;ZHOU Yuan-hua;YANG Wen-yan;ZHONG Ting-ting(College of Electrical and New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,China Three Gorges University,Yichang 443002,China;State Grid Lu’An Electric Power Supply Company,Luan 237000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]三峡大学新能源微电网湖北省协同创新中心,湖北宜昌443002 [3]国网六安供电公司,安徽六安237000

出　　处：《电机与控制学报》2020年第5期51-57,共7页Electric Machines and Control

基　　金：国家自然科学基金(51307097)

摘　　要：油纸绝缘的老化会引起其极化/去极化特征量发生改变,为了利用极化/去极化特征来定量分析油纸系统的老化状态,提出采用极化/去极化电量差斜率计算绝缘纸电导率的方法,首先在实验室测试了不同老化油纸绝缘样本的极化/去极化电流(PDC),并根据新方法计算出了不同老化样本中绝缘纸的电导率,其次将该方法计算出的电导率与根据IDAX300和Keithley静电仪测得的实验数据计算后的绝缘纸电导率进行了误差对比分析;最后运用最小二乘法求得了绝缘纸电导率与老化天数之间的定量关系。研究结果表明极化/去极化电量差斜率法计算绝缘纸电导率具有一定的有效性,绝缘纸电导率与老化天数呈指数函数关系。本研究将为量化评估油纸绝缘变压器的老化特性提供新的参考。Aging of oil paper insulation will cause polarization/depolarization characteristic changes.In order to analyze the aging state of the oil paper system by polarization/depolarization,this paper presents a method for calculating the conductivity of aging insulation paper by polarization/depolarization gradient.The polarization/depolarization current(PDC)of different aging oil paper insulation samples was tested in the laboratory,and the conductivity of insulating paper in different aging samples was calculated according to the new method.Secondly,the electrical conductivity calculated by this method was compared with the electrical conductivity of the insulating paper calculated by the experimental data obtained by the IDAX300 and the Keithley electrometer.Finally,the quantitative relationship between electrical conductivity and aging days of insulation paper was obtained by least square method.The results show that the polarization/depolarization gradient method is effective in calculating the conductivity of insulation paper.The conductivity of insulating paper is exponential with the aging days.This research provides a new reference for quantifying the aging characteristics of oil paper insulation transformer.

关 键 词：变压器 油纸绝缘系统 极化/去极化电流 老化 电量差 电导率 

分 类 号：TM411[电气工程—电器]