Designation:D2300−08StandardTestMethodforGassingofElectricalInsulatingLiquidsUnderElectricalStressandIonization(ModifiedPirelliMethod)1ThisstandardisissuedunderthefixeddesignationD2300;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodmeasurestherateatwhichgasisevolvedorabsorbedbyinsulatingliquidswhensubjectedtoelectricalstressofsufficientintensitytocauseionizationincellshavingspecificgeometries.1.2Thistestmethodisnotconcernedwithbubblesarisingfromsupersaturationoftheinsulatingliquid.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityofwhoeverusesthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionssee5.1.4and8.4.2.ReferencedDocuments2.1ASTMStandards:2D924TestMethodforDissipationFactor(orPowerFactor)andRelativePermittivity(DielectricConstant)ofElectri-calInsulatingLiquids3.SummaryofTestMethod33.1Afterbeingsaturatedwithagas(usuallyhydrogen),theinsulatingliquidissubjectedtoaradialelectricalstress.Thegasspaceabovetheinsulatingliquidfilmisionizedduetotheelectricalstressesandthereforetheinsulatingliquidsurfaceattheinsulatingliquid-gasinterfaceissubjectedtoionicbom-bardment.Theevolvingorabsorbingofgasiscalculatedinvolumeperunitoftimefromchangesinpressurewithtimefromtwospecimensrunonthesamesample.3.2Thistestmethodindicateswhetherinsulatingliquidsaregasabsorbingorgasevolvingunderthetestconditions.4.SignificanceandUse4.1Forcertainapplicationswheninsulatingliquidisstressedathighvoltagegradients,itisdesirabletobeabletodeterminetherateofgasevolutionorgasabsorptionunderspecifiedtestconditions.Atpresenttimecorrelationofsuchtestresultswithequipmentperformanceislimited.4.2Inthistestmethod,hydroge...
