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【英文标准名称】:TestMethodforHigh-Voltage,Low-Current,DryArcResistanceofSolidElectricalInsulation
【原文标准名称】:固体电绝缘的高压、低电流和干电弧电阻试验方法
【标准号】:ANSI/ASTMD495-1999
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:绝缘;试验
【英文主题词】:Arcresistance;Electricalengineering;Electricalinsulatingmaterials;Electricalinsulation;Electricaltesting;Highvoltage;Insulations;Plastics;Solidelectricalinsulatingmaterials;Testing
【摘要】:Thistestmethodcovers,inapreliminaryfashion,thedifferentiationamongsimilarmaterialswithrespecttotheirresistancetotheactionofahigh-voltage,low-currentarcclosetothesurfaceofinsulation,intendingtoformaconductingpaththereinorincausingthematerialtobecomeconductingduetothelocalizedthermalandchemicaldecompositionanderosion.Theusefulnessofthistestmethodisveryseverelylimitedbymanyrestrictionsandqualifications,someofwhicharedescribedinthefollowingparagraphsandinSection.Generally,thistestmethodshouldnotbeusedinmaterialspecifications.Wheneverpossible,alternativetestmethodsshouldbeused,andtheirdevelopmentisencouraged.Thistestmethodwillnot,ingeneral,permitconclusionstobedrawnconcerningtherelativearcresistancerankingsofmaterialsthatmaybesubjectedtoothertypesofarcs:forexample,highvoltageathighcurrents,andlowvoltageatloworhighcurrents(promotedbysurgesorbyconductingcontaminants).Thetestmethodisintended,becauseofitsconvenienceandtheshorttimerequiredfortesting,forpreliminaryscreeningofmaterial,fordetectingtheeffectsofchangesinformulation,andforqualitycontroltestingaftercorrelationhasbeenestablishedwithothertypesofsimulatedservicearctestsandfieldexperience.Becausethistestmethodisusuallyconductedundercleananddrylaboratoryconditionsrarelyencounteredinpractice,thepredictionofamaterial'srelativeperformanceintypicalapplicationsandinvarying"cleantodirty"environmentsmaybesubstantiallyaltered(Note0).Cautionisurgedagainstdrawingstrongconclusionswithoutcorroboratingsupportofsimulatedservicetestsandfieldtesting.Rather,thistestmethodisusefulforpreliminaryevaluationofchangesinstructureandcompositionwithoutthecomplicatinginfluenceofenvironmentalconditions,especiallydirtandmoisture.Bychangingsomeofthecircuitconditionsdescribedhereinithasbeenfoundpossibletorearrangemarkedlytheorderofarcresistanceofagroupoforganicinsulatingmaterialsconsistingofvulcanizedfiberandofmoldedphenolicandaminoplastics,somecontainingorganic,andsomeinorganic,filler.Whilethistestmethodusesdry,uncontaminatedspecimensurfaces,TestMethodD2132,TestMethodsD2303,andTestMethodD3638employwet,contaminatedspecimensurfaces.Theiruseisrecommendedforengineeringpurposesandtoassistinestablishingsomedegreeofsignificancetothistestmethodforqualitycontrolpurposes.Thistestmethodisnotapplicabletomaterialsthatdonotproduceconductivepathsundertheactionofanelectricarc,orthatmeltorformfluidresiduesthatfloatconductiveresiduesoutoftheactivetestareatherebypreventingformationofaconductivepath.Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,see,,Section,and.
【中国标准分类号】:K15
【国际标准分类号】:29_035_01
【页数】:
【正文语种】:英语