油纸绝缘热老化过程中含水量变化趋势及水分转移规律—廖瑞金828高电压技术第36卷第4期2010年4月30日HighVoltageEngineering’Vol.36,No.4,Apr.30,20:10油纸绝缘热老化过程中含水量变化趋势及水分转移规律廖瑞金，尹建国,杨丽君，巩晶，唐超（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）摘耍:根据某一具体时刻的油中含水量（即水的体积分数）来估算纸中含水量误差较大，但根据油、纸的含水量绝对值来进行变压器状态评估及受潮分析不全面。为此，在110。C和130。C下设计了初始含水量分别为1%、3%、5%的绝缘纸在矿物油中的加速热老化试验。系统研究了老化过程中绝缘纸平均含水量、油中含水量及油纸绝缘系统总含水量变化趋势;通过分析系统总含水量的变化及绝缘纸内部水分分布情况，探讨了油纸绝缘的水分转移规律;分析了老化过程中油中水分与纸中水分的关系。结果表明:老化过程中油中水分、纸中水分及系统总含水量均是波动的，且3者的波动幅度相互之间有较好的正相关性;初始含水量较高（3%、5%）时’油纸绝缘系统与外部氮气环境之间的水分转移起主导作用，初始含水量较低（1%）时,水分主耍在系统内部油、纸二相间转移;老化过程中油中水分与纸中水分不能构成函数关系。因此提出应根据整个老化过程中油、纸及油纸绝缘系统总含水量3者整体上的波动趋势和波动幅度来进行变压器状态评估及受潮分析。关键词:水分;油纸绝缘;热老化;变压器;波动;转移:TM855文献标志码:A文章编号:1003-6520(2010)04-0828-07MoistureContentVariationandTransferofOil・paperlnsulationDuringThermalAgingProcessLIAORui-激n,YIN激an-guo,YANGLi-jun,GONG激ng,TANGChao(StateKeyLaboratoryofPowerTransmissionEquipmentSystemSecurityandNewTechnology,ChongqingUniversity,Chongqing400030,China)Abstract:Thatthemoisturecontentinoilisusedtoestimatethemoisturecontentinpaperhasagreaterror,andthattheabsolutevalueofmoisturecontentinoilandpaperisusedtoassessinsulationstateandinsulationdampisincomplete.Wedesignedaagingtestjnwhichtheinsulatingpaperswiththeinitialmoisturecontentsofl%,3%,5%wereagedinmineraloilatllO'Candl30°C,respectively.Thevariationtrendsofwatercontentinpaper,inoilandtotalmoisturecontentofoil-paperinsulationsystemduringtheagingprocesswerestudied.Moreover,theruleofmoisturetransferofoil・paperinsulationsystemwasdiscussedthroughanalyzingthevariationoftotalmoisturecontentofoil-paperinsulationsystemandthedistributedstateofmoistureinsideinsulatingpapers’andtherelation・shipofmoisturecontentbetweeninoilandinpaperwasanalyzed.Theresultsindicatethat,thewatercontentinoiljnpaperandtotalmoisturecontentofoil-paperinsulationsystemarefluctuantduringtheagingprocess,thefluctuationamplitudeamongthethreehasagoodpositivecorrelation;thetransferofmoisturebetweentheoil・paperinsulationsystemandtheexternalnitrogenenvironmentplaysaleadingrolewhenthemoisturecontentishigher(3%,5%),andthetransferofmoisturebetweenoilandpaperplaysaleadingrolewhenthemoisturecontentislower(l%);Themoisturecontentinoilandpapercannotconstitutefunction.Therefore,tomaketheassessmentinsulationstateandinsulationdampeffectmoreaccuratejtissuggestedthattheglobalrelationshipofthefluctua-tionstrendamongoil,paperwatercontentandthetotalmoisturecontentofoil-paperinsulationsystemandthefluctuationamplitudeshouldbetakeintoconsideration.Keywords:water;oil-paperinsulation;thermalaging;powertransformer;fluctuant;transfer0引言油•纸绝缘是变压器内绝缘的主要组成部分，二者在长期运行过程中受电、热、机械振动、水分、氧气等多种因素的影响逐渐老化,导致变压器绝缘性能下降[1-4]o水分能严重降低油纸绝缘的电气强度，且加速油纸绝缘老化、缩短绝缘寿命，被喻为除温度外油纸绝缘的“头号敌人”。因...