文档名：基于介质响应电流频变特性的油纸绝缘受潮状态评估方法
摘要：油纸绝缘受潮状态的准确评估对于电力设备安全稳定运行至关重要,该文研究并提出了一种以介质响应电流幅值Im随激励电压频率f变化为特征的油纸绝缘受潮评估新方法.试验测试了不同水分含量油纸绝缘样品在频率f为0.01～50Hz正弦激励电压下的f-Im特性,并对Im按照其最小值进行归一化处理得到f-I*曲线.结果表明:在双对数坐标下,随着受潮程度增加油纸绝缘的f-I*曲线会由干燥时的一条直线逐渐变为一条下凹的曲线.进一步提出将50Hz处的I*值I*@50Hz作为特征参量,用于量化油纸绝缘水分含量,并在实验室模型和实际油浸式设备上验证了该方法的有效性.与传统利用频域介电谱诊断油纸绝缘受潮的方法相比,该文所提特征参量与水分含量的量化关系受绝缘结构差异和油纸绝缘聚合度变化的影响较小,在设备绝缘结构和老化状态信息缺失的情况下具有更好的普适性.另外,该方法所需测试时间仅约100s,具有高效、准确和便捷的特点.
Abstract：Moistureintheoil-paperinsulationisanimportantcauseofperformancedegradationinpowertransformers,andaccurateassessmentofthemoisturestateoftheinsulationinsidetheequipmentsisimportanttoensureitssafeoperation.Atpresent,themethodofprojectingthemoisturecontentofinsulatingpaperaccordingtothemoisturecontentinoilhasledtogreaterrorsinfieldapplicationduetothecomplicatedinfluencingfactors.Inrecentyears,theinsulationconditiondiagnosistechnologybasedondielectricresponsetestmethodhasreceivedwideattention,andsomecharacteristicparametersandevaluationmethodshavebeenproposed,buttheaccuracyoftheevaluationresultsisgreatlyinfluencedbythedifferencesintransformerinsulationstructuresandcannotyetmeettheneedsofpracticalengineeringapplications.Basedonthepreviousresearchresults,thispaperfurtherexplorestheinfluenceofmoistureontheresponsecurrentcharacteristicsofoil-paperinsulation,andaimstoproposeanefficientevaluationanddiagnosismethodofinsulationmoisturestatethatislessaffectedbythedifferenceofinsulationstructureandeasytoimplementinthefield.First,oil-paperinsulationsampleswithdifferentmoisturecontentsanddifferentpolymerizationdegreeswereprepared.Inordertomeasuretheresponsecurrentsignalsoftheoil-paperinsulationundervoltageexcitationofdifferentfrequenciesandamplitudes,aresponsecurrenttestsystemforoil-paperinsulationwasbuilt.Theresponsecurrentsofthesamplesweretestedinthefrequencyrangeof0.01Hzto50Hz.Theresponsecurrentamplitudeat0.01Hzwasusedasthereferencevalue,andtheresponsecurrentamplitudeatdifferentfrequencieswasnormalizedtoobtainthef-I*curve.Thef-I*curveofoil-paperinsulationwillchangefromastraightlinewhendrytoaconcavecurveasthemoisturecontentinthepaperincreases,whilethef-I*curvesofoil-paperinsulationwithdifferentpolymerizationdegreesbasicallyoverlap.Whenthemoisturecontentislow,thef-I*curvebasicallydoesnotchangewiththevoltageamplitude,butwhenthemoisturecontentislargethevoltageincreasewillcausetherightsideofthef-I*curvetoshiftdownslightly.Oil-papercompositeinsulationsystemswithdifferentstructuresweremadeusingcircularcardboardandringcardboard,andthetestresultsshowedthattheFDSmethodissignificantlyaffectedbytheinsulationstructure,whilethedifferenceininsulationstructurehasminimaleffectonthef-I*curvewhenthemoisturecontentintheinsulationpaperisthesame.Finally,I*@50Hz(i.e.,theI*valueat50Hz)wasproposedasacharacteristicparametertoquantifythemoisturecontentofthetransformeroil-paperinsulation,andafittingequationbetweenitandthemoisturecontentofoil-paperinsulationwasestablished.Foroil-impregnatedinsulatedcardboardwithdifferenttimesofnaturalmoistureabsorption,theabsoluteerrorbetweentheevaluationresultsandtheactualmeasurementresultsoftheKarlFischerinstrumentwaslessthan0.09%.Foractualoil-paperinsulatedbushingsandtransformers,theevaluationresultswerereasonableandconsistentwiththeoverallpatternoftheresultsobtainedbycommercialinsulationdiagnosticanalyzers.Thefollowingconclusionscanbedrawnfromtheexperimentalresults:(1)Thef-I*curveiscloselyrelatedtothedampstateoftheoil-paperinsulation.Whentheoil-paperinsulationisdry,itsf-I*curveisastraightline.However,theriselawofthef-I*curveinthelow-frequencybandwillsignificantlychangeaftertheinsulationisdamp,andthewholecurvewillturnintoaconcavecurve.(2)Thetestresultsofthef-I*curvesarebasicallynotaffectedbytheinsulationstructureandinsulationaging.ThismechanismhasmoreadvantagescomparedwiththeFDStestmethod,whichisgreatlyaffectedbytheinsulationstructure.(3)ThisstudyproposedtotakeI*@50Hz,whereintheI*valueat50Hzinthef-I*curveisusedasthecharacteristicparametertoevaluatethedampnessoftheoil-paperinsulation,andthetesttimeisonlyapproximately100s.Theeffectivenessofthismethodtoevaluatethemoisturecontentofoil-immersedequipmentisverifiedbytestingtheactualoil-paperinsulationbushingsandtransformers.
作者：夏源 杨丽君 吕晓露 汪可 李金忠 Author：XiaYuan YangLijun LüXiaolu WangKe LiJinzhong
作者单位：输变电装备技术全国重点实验室(重庆大学)重庆400044中国电力科学研究院有限公司北京100192
刊名：电工技术学报 ISTICEIPKU
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(11)
分类号：TM855
关键词：油纸绝缘 频率 响应电流 水分含量
Keywords：Oil-paperinsulation frequency responsecurrent moisturecontent
机标分类号：U457TM762TM862
在线出版日期：2024年6月18日
基金项目：国家电网公司总部科技项目基于介质响应电流频变特性的油纸绝缘受潮状态评估方法[
期刊论文] 电工技术学报--2024, 39(11)夏源 杨丽君 吕晓露 汪可 李金忠油纸绝缘受潮状态的准确评估对于电力设备安全稳定运行至关重要,该文研究并提出了一种以介质响应电流幅值Im随激励电压频率f变化为特征的油纸绝缘受潮评估新方法.试验测试了不同水分含量油纸绝缘样品在频率f为0.01～50...参考文献和引证文献
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