变压器油老化对其局部放电及介质响应特性的影响  

Influence of Transformer Oil Aging to Its Partial Discharge and Dielectric Response Characteristics

作　　者：李军浩[1] 郭磊[2] 吕亮[2] 李彦明[1] 翁威[2] 

机构地区：[1]西安交通大学电气学院,陕西西安710049 [2]陕西电力科学研究院,陕西西安710054

出　　处：《陕西电力》2009年第11期1-4,共4页Shanxi Electric Power

基　　金：国家自然科学基金资助:50977075

摘　　要：变压器油在运行过程中受到电、热、机械和环境等应力的影响,会逐渐老化。在陕西省电力公司下属变电站现场取样了3种不同老化程度的变压器油样,对其局部放电特性和介质响应特性进行了测量和分析。局部放电测量表明,油中的局部放电呈现一簇突然爆发的脉冲序列形式,老化的油样中脉冲序列呈现持续时间短、脉冲序列多的特点。油样的极化/去极化电流测量表明随着油样老化程度的升高,极化电流和去极化电流的起始部分会随之升高。Transformer oil is aging for thermal,electric,mechanical and environment stress.The oil aging will influence its electric characteristics.Three different aging degree oil samples are obtained from field.Partial discharge and dielectric response test were performed in lab.The partial discharges,which take place in transformer oil for electric field concentration,appear in the form of pulse bursts that consist of a series of discrete current pulses.The pulse bursts duration is shorter and pulse number is more in aged oil sample than fi＇esh oil sample. Polarization/Depolarizatinn current test results show that the amplitude of Polarization/Depolarization will increase with oil aging.

关 键 词：变压器油 老化 局放 介质响应 

分 类 号：TM855[电气工程—高电压与绝缘技术] U416.216[交通运输工程—道路与铁道工程]