Designation:D2864−21aStandardTerminologyRelatingtoElectricalInsulatingLiquidsandGases1ThisstandardisissuedunderthefixeddesignationD2864;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThedefinitionscontainedinthisterminologypertaintotermsastheyareusedinconjunctionwithfluidinsulatingmaterials.Insofaraspossible,thedefinitionsareconsistentwithacceptedgeneralusage,andmayalsocontainadditionalinformationdeemedtobeofvalueintestingoffluidinsulatingmaterials.1.ReferencedDocuments1.1ASTMStandards:2D611TestMethodsforAnilinePointandMixedAnilinePointofPetroleumProductsandHydrocarbonSolventsD2007TestMethodforCharacteristicGroupsinRubberExtenderandProcessingOilsandOtherPetroleum-DerivedOilsbytheClay-GelAbsorptionChromato-graphicMethodD2140PracticeforCalculatingCarbon-TypeCompositionofInsulatingOilsofPetroleumOriginD2300TestMethodforGassingofElectricalInsulatingLiquidsUnderElectricalStressandIonization(ModifiedPirelliMethod)D2500TestMethodforCloudPointofPetroleumProductsandLiquidFuelsD3117TestMethodforWaxAppearancePointofDistillateFuels(Withdrawn2010)3E355PracticeforGasChromatographyTermsandRelation-ships2.Terminologyac,n—symbolusedtodesignateanelectricvoltageorcurrentwhoseamplitudevariesperiodicallyasafunctionoftime,itsaveragevalueoveronecompleteperiodbeingzero.OnecompleterepetitionofthewavepatternisreferredtoasaCYCLE,andthenumberofcyclesoccurringinonesecondiscalledtheFREQUENCY,measuredinhertz(Hz).Forexample,theelectricitysuppliedbycommercialutilitycompaniesintheUnitedStatesis,inmostlocalities,60Hz,althoughotherfrequenciesmaybeencountered.acidtreating,n—arefiningprocessinwhichanunfinishedpetroleuminsulatingoiliscontactedwithsulfuricacidtoimproveitscolor,odor,stability,andotherproperties.aclosscharacteristics,n—thosepropertiesofadielectricorinsulationsystem(...
