Designation:D7150−13(Reapproved2020)StandardTestMethodfortheDeterminationofGassingCharacteristicsofInsulatingLiquidsUnderThermalStress1ThisstandardisissuedunderthefixeddesignationD7150;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribestheprocedurestodeterminethegassingcharacteristicsduetothermalstressat120°Cofinsulatingliquidsspecificallyandwithouttheinfluenceofotherelectricalapparatusmaterialsorelectricalstresses.Thistestmethodwasprimarilydesignedforinsulatingmineraloil.Itcanbeappliedtootherinsulatingliquidsinwhichdissolvedgas-in-oilanalysis(TestMethodD3612)iscommonlyper-formed.1.2Thistestmethodisparticularlysuitedfordetectionofthephenomenonsometimesknownas“straygassing”andisalsoreferredtoinCIGRETF11B39.1.3Thistestmethodisperformedontransformerinsulatingliquidstodeterminethepropensityoftheoiltoproducecertaingasessuchashydrogenandhydrocarbonsatlowtemperatures.1.4Thistestmethoddetailstwoprocedures:1.5MethodAdescribestheprocedurefordeterminingthegassingcharacteristicsofinsulatingliquids,at120°Cfor164h.1.6MethodBdescribestheprocedureforprocessingtheinsulatingliquidthroughanattapulgiteclaycolumntoremoveorganiccontaminantsandotherreactivegroupsthatmayinfluencethegassingbehaviorofaninsulatingliquid,whichissuspectedofbeingcontaminated.Thisprocedureappliestobothnewandusedinsulatingliquids.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Englishunitsareusedwhenthereisnometricequivalent.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.9Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciple...
