Designation:D3277–95(Reapproved2001)e1StandardTestMethodsforMoistureContentofOil-ImpregnatedCellulosicInsulation1ThisstandardisissuedunderthefixeddesignationD3277;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.e1NOTE—EditorialchangesweremadeinApril2001.1.Scope1.1Thesetestmethodscoverthedeterminationoftheweightpercentofwaterinneworaged,oil-impregnatedelectricalinsulation.Thesetestmethodsdependonsolventextractionofthewateratroomtemperature.Therangefrom0.1to7.0%waterhasbeenexplored.1.2Therearefourtestmethods,A,B,C,andD.MethodsAandBforthinpaperanddensematerials,respectively,aremanualmethodsforsolventextractionofwaterfromthespecimens.Titrationisusedtodeterminetheamountofwater.MethodCusesautomatictitrationtodeterminetheamountofwater.MethodDisadirectautomatedmethodforextractionanddetectionofthewater.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1533TestMethodsforWaterinInsulatingLiquids(KarlFischerReactionMethod)23.SummaryofTestMethods3.1ThesetestmethodsdependonsolventextractionofthemoistureatroomtemperatureandKarlFischertitration(seeTestMethodsD1533).Forpaperinsulation0.010in.(0.25mm)thickandless,extractionisaccomplishedbystirringthesolventwithsmallpiecesofinsulation.Inthespecialcaseofdense,thicksections,suchaspressboard,theextractionrateisincreasedbydelaminatingthicksectionsandpulpingthesampleinablender.4.SignificanceandUse4.1Moisturehasanadverseeffectonthedielectricstrength,dielectricloss,dcresistivity,andagingcharacteristicsofoil-impregnatedcellulosicinsulatingmaterials.4.2Whencellulosicinsulationsuchaspaperandpressboardareimpre...
