ASTM D5288-2010 使用多种电极材料(铂除外)测定电绝缘材料的痕迹指数的标准试验方法

作者:标准资料网 时间:2024-05-23 00:30:04  浏览:9720   来源:标准资料网

【英文标准名称】:StandardTestMethodforDeterminingtheTrackingIndexofElectricalInsulatingMaterialsUsingVariousElectrodeMaterials(ExcludingPlatinum)
【原文标准名称】:使用多种电极材料(铂除外)测定电绝缘材料的痕迹指数的标准试验方法
【标准号】:ASTMD5288-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:copperelectrodes;comparativetrackingindex;CTI;TI;TI-Cu;track;tracking;tracking;contamination;trackingindex;trackingresistance;Comparativetrackingindex(CTI);Copperelectrodes;CTI-CU;Tracking,contamination;Trackingsystems;
【摘要】:Electricalequipmenthasthepotentialtofailasaresultofelectricaltrackingofinsulatingmaterialthatisexposedtovariouscontaminatingenvironmentsandsurfaceconditions.AnumberofASTMandothertestshavebeendesignedtoquantifybehaviorofmaterials,especiallyatrelativelyhighvoltages.Thismethodisanacceleratedtestwhichatrelativelylowtestvoltages,providesacomparisonoftheperformanceofinsulatingmaterialsunderwetandcontaminatedconditions.TheTrackingIndexx2014;CopperElectrodestestisnotrelateddirectlytothesuitableoperatingvoltageinservice.Whenorganicelectricalinsulatingmaterialsaresubjectedtoconductioncurrentsbetweenelectrodesontheirsurfaces,manyminutetree-likecarbonaceouspathsortracksaredevelopedneartheelectrodes.Thesetracksareorientedrandomly,butgenerallypropagatebetweentheelectrodesundertheinfluenceoftheappliedpotentialdifference.Eventuallyaseriesoftracksspanstheelectrodegap,andfailureoccursbyshortingoftheelectrodes.Asinothertrackingtestmethods,forexample,IEC112andTestMethodD3638,thistestmethodspecifiestestproceduresthatareintendedtopromotetheformationofsurfacedischargeswhichwillproducecarbontracksinareproduciblemanner.Sincetheseconditionsrarelyreproducetheactualconditionsencounteredinservice,theresultsoftrackingtestscannotbeusedtoinfereitherdirectorrelativeservicebehaviorofamaterialinaspecificdesignapplication.Trackingtestscanbeusedforscreeningpurposesonly.Suitabilityisverifiedthroughtestingofthematerialinactualenduseorunderconditionsthatcloselysimulateactualenduse.TheuseofcopperelectrodesinthistypeoftestwasdevelopedattheUniversityofCincinnati,NEMAlaboratory.ItisfeltbythemembersoftheIndustrialLaminatesSectionofNEMAthatusingcopperelectrodesgivesamorerealisticvalueforatrackingindex,relatedtotheresinsystemusedtoreinforcethesubstrateofalaminate.Ingeneral,trackingtestsmadewithcopperelectrodestendtogivelowervaluesthanplatinumelectrodesinthesametypeoftest.Itisafactthatcopperismorewidelyusedthanplatinumforelectricalconductors.1.1Thistestmethodwasdevelopedusingcopperelectrodestoevaluatethelow-voltage(upto600V)trackingresistanceofmaterialsinthepresenceofaqueouscontaminants.Note18212;Atthistime,onlyindustriallaminateshavebeenexaminedusingthismethodwhichwasdevelopedattheNationalManufacturersElectricalAssociation(NEMA)laboratorylocatedattheUniversityofCincinnati.Itwasfoundthatacloserendpoint(lessscatter)wasobtainedthanwithplatinumelectrodes,andmaterialstestedtendedtoberankedbyresinsystem.1.1.1Itisacceptabletoconsiderotherelectrodematerialsforusewiththistestmethoddependingupontheapplicationoftheinsulatingmaterial.1.2ThistestmethodissimilartoTestMethodD3638,whichdeterminesthecomparativetrackingindexofmaterialsusingplatinumelectrodestoproducethetrackingonthespecimensurface.1.3Thevaluesstatedinmetric(SI)unitsarethestandard.Theinch-poundequivalentsofthemetricunitsareapproximate.1.4Thisstandardisusedtomeasureanddescribetheresponseofmaterials,products,orassembliestoheatandflameundercontrolledconditions,butdoesnotbyitselfincorporateallfactorsrequiredforfirehazardorfireriskassessment......
【中国标准分类号】:K15
【国际标准分类号】:29_035_01
【页数】:5P.;A4
【正文语种】:英语