Designation:D5222−08StandardSpecificationforHighFire-PointMineralElectricalInsulatingOils1ThisstandardisissuedunderthefixeddesignationD5222;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationdescribesahighfire-pointmineraloilbasedinsulatingfluid,foruseasadielectricandcoolingmediuminnewandexistingpoweranddistributionelectricalapparatus,suchastransformersandswitchgear.1.2Highfire-pointinsulatingoildiffersfromconventionalmineralinsulatingoilbypossessingafire-pointofatleast300°C.Highfire-pointmineralinsulatingoilsarealsoreferredtoas“lessflammable”mineralinsulatingoils.Thispropertyisnecessaryinordertocomplywithcertainapplicationrequire-mentsoftheNationalElectricalCode(Article450-23)orotheragencies.Thematerialdiscussedinthisspecificationismis-ciblewithotherpetroleumbasedinsulatingoils.Mixinghighfire-pointliquidswithlowerfirepointhydrocarboninsulatingoils(forexample,SpecificationD3487mineraloil)mayresultinfirepointsoflessthan300°C.1.3Thisspecificationisintendedtodefineahighfire-pointelectricalmineralinsulatingoilthatiscompatiblewithtypicalmaterialofconstructionofexistingapparatusandwillsatis-factorilymaintainitsfunctionalcharacteristicinitsapplicationinthisapplication.Thematerialdescribedinthisspecificationmaynotbemisciblewithelectricalinsulatingliquidsofnon-petroleumorigin.Theusershouldcontactthemanufac-turerofthehighfire-pointinsulatingoilforguidanceinthisrespect.1.4Thisspecificationappliesonlytonewinsulatingmate-rialoilasreceivedpriortoanyprocessing.Informationonin-servicemaintenancetestingisavailableinappropriateguides.2Theusershouldcontactthemanufacturersoftheequipmentoroilifquestionsofrecommendedcharacteristicsormaintenanceproceduresarise.2.ReferencedDocuments2.1ASTMStandards:3D92TestMethodforFlashandFirePointsbyClevelandOpenCupTe...
