温度对油纸绝缘介电响应特性的影响  

Effect of Temperature on Dielectric Response Characteristics of Oil Impregnated Pressboard

作　　者：王世强[1] 魏建林[1] 张冠军[1] 杨双锁[1] 董明[1] 刘孝为[2] 霍大渭[2] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]陕西电力科学研究院,西安710054

出　　处：《电工技术学报》2012年第5期50-55,共6页Transactions of China Electrotechnical Society

基　　金：国家高技术研究发展计划(863计划)(2007AA04Z411);国家重点基础研究发展计划(973计划)(2009CB724505-1);输配电装备及系统安全与新技术国家重点实验室开放课题(2007DA10512709405)资助项目

摘　　要：为了研究温度对变压器油纸绝缘介电响应测量结果的影响,以更准确地评估纸板微水含量和老化状态,设计了在不同温度下对变压器油浸绝缘纸板试品分别进行时域回复电压(RV)和频域谱(FDS)测量的实验,比较不同温度下油纸绝缘RV极化谱特征参数以及介质损耗因数tan、复电容实部C′、虚部C″的频域谱曲线变化,分析变化趋势及原因,研究温度对介电响应方法评估绝缘纸板微水含量及其老化状态的影响。结果显示,随着温度的升高,试品RV极化谱曲线峰值向较短充电时间方向偏移,峰值时间和峰值电压均减小;试品tan和C″频域谱曲线向高频方向偏移,最小值略微增大;C′变大,在较低频率尤其明显。因此,在用介电响应法评估纸板微水含量及老化状态必须考虑温度影响,否则将导致评估结果失实。To investigate temperature effect on dielectric response measurement results of transformer oil-paper insulation, and for more accurate assessment of insulation condition and moisture content in pressboard, the time-domain return voltage （RV） and frequency domain spectroscopy （FDS） experiments are designed and performed on oil-impregnated pressboard at different temperatures. The variations of characteristic parameters of RV spectra and FDS curves of the dissipation factor tanS, real capacitance C＇ and imaginary capacitance C＂ at different temperatures are compared. The changing trends and reason are analyzed. Temperature influences on evaluating moisture content and aging status with dielectric response measurements results are investigated. The results show that, with temperature increasing, the peak of RV spectrum curve shifts to shorter charging time, and peak values of both charging time and voltage decrease, tan~, C＂ curves shift to higher frequency, while the minimum values of tand and C＂ increase slightly. C＇ increases, especially in lower frequency range. It is revealed that, temperature effect on test results should be considered for evaluating moisture content and aging condition of pressboard. Otherwise, it will lead to a wrong aging judgment for on-site transformer solid insulation.

关 键 词：温度 油纸绝缘 介电响应 微水含量 老化状态 

分 类 号：TM855[电气工程—高电压与绝缘技术]