变压器油纸绝缘频率响应特性影响因素  

Factors Influencing Dielectric Frequency Responses of Oil-Paper Insulation

作　　者：刘君[1] 吴广宁[1] 周利军[1] 闵英杰[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2011年第2期282-286,293,共6页Journal of Southwest Jiaotong University

基　　金：国际科技合作项目(2009DFA72230)

摘　　要：频率响应法为表征变压器油纸绝缘的老化状态及微水含量提供了新的手段,但环境因素尤其是温度对测试结果有严重的影响.为研究不同温度下油纸绝缘频率响应变化规律,利用频率响应法对油纸绝缘进行物理建模,建立了时域响应函数及其频域响应函数,搭建了油纸绝缘频率响应测试系统,应用该系统对比测试了不同温度下油纸绝缘体系频率响应,并计算了单独油浸纸频率响应.结果表明:油隙对测试结果的影响较小,最大误差在10%以内;油纸绝缘介质损耗在低频段随频率增大而减小,在高频段变化不大;随着温度升高,油纸绝缘介质响应幅值增大,其形状基本不变,并向高频率方向移动;频率一定时,油纸绝缘复介电常数与温度的倒数成线性比例.The dielectric frequency response method was used to model an oil-paper insulation system.The time domain dielectric response function and its frequency response were derived.An experimental system was designed to measure the dielectric frequency responses of oil-paper insulation at different temperatures.Also,the dielectric frequency response of the pure impregnated paper was calculated.The results show that the errors caused by the oil gap were not significant,with the maximum error being less than 10%.Significant dielectric loss of oil-paper insulation occurred in low frequencies,but not in high frequency.As the temperature increases,the shapes of oil-paper dielectric frequency response curves almost keep the same,and move to high frequency direction.The logarithm of dielectric loss of oil-paper is linear to reciprocal of temperature when frequency is constant.

关 键 词：频率响应法 油纸绝缘 介质损耗 绝缘 温度 

分 类 号：TM855[电气工程—高电压与绝缘技术]