变压器油纸绝缘老化动力学模型及寿命预测  

Ageing Kinetic Model and Lifetime Model of Oil-paper Insulation in Transformers

作　　者：廖瑞金[1] 孙会刚[2] 巩晶 李伟 尹建国[1] 唐超[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]ABB集团研究中心,北京100016 [3]浙江省电力公司,宁波315000 [4]重庆电力公司璧山供电局,重庆402760

出　　处：《高电压技术》2011年第7期1576-1583,共8页High Voltage Engineering

基　　金：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自主研究项目(2007DA10512708103)~~

摘　　要：变压器固体绝缘材料(绝缘纸)寿命决定其使用年限,温度和水分是影响绝缘纸纤维素老化降解最主要的因素。以油浸变压器内广泛应用的#25变压器油和普通牛皮纸为实验原料,模拟变压器实际生产流程,制作初始水分质量分数分别为1%、3%、5%的油纸绝缘试品,并将3个水分质量分数的油纸绝缘试品分别在90°C、110°C和130°C下进行了长期的加速热老化。细致分析了不同温度和水分条件下油纸绝缘试品老化过程中绝缘纸聚合度的变化规律以及以聚合度为参量的油纸绝缘老化动力学模型。得到结果如下:老化温度和油纸绝缘初始水分质量分数越高,油纸绝缘试品的老化速度越快,并且油纸绝缘试品在到达其老化后期,绝缘纸聚合度下降速率会减缓;绝缘纸聚合度损失累积动力学模型(式(3))能很好地描述温度和水分作用下的油纸绝缘试品老化过程中绝缘纸聚合度变化规律;温度和水分协同作用下油纸绝缘材料的表观活化能为(101±15)kJ/mol;建立了基于时温叠加理论及聚合度损失累积模型的温度和水分联合作用下普通变压器绝缘纸在矿物油中老化的寿命模型(式(9)),该模型可预测温度和水分两因子作用下油纸绝缘的老化寿命。Using # 25 transformer oil and ordinary kraft paper as raw materials, we simulated the actual transformer production process, in which the initial moisture contents of the oil-paper samples were set to be 1 %, 3%, and 5 %, and were aged at 90 ℃, 110 ℃, and 130 ℃. Moreover, we analyzed the polymerization degree of insulation paper in ageing process and cellulose degradation kinetic model in terms of DP. The main conclusions can be drawn as fol- lows： the higher temperature and the more moisture contents are, the faster the degree of polymerization will de- cline, and more rapidly the oil-paper insulation will age. The insulation ageing rate is not constant but decreases with ageing time. The cellulose degradation kinetic model in terms of the DP loss accumulation is able to explain the real experimental data of cellulose ageing in mineral oil under different temperature and moisture contents. The ap- parent activation energy for kraft paper ageing in mineral oil is Ea = （101±15） kJ/mol. The oil-paper insulation life prediction model is thus established based on time-temperature superposition theory and DP loss accumulation kinetic model.

关 键 词：变压器 油纸绝缘 动力学 老化寿命模型 温度 水分 

分 类 号：TM855[电气工程—高电压与绝缘技术]