Designation:D2477−07(Reapproved2012)StandardTestMethodforDielectricBreakdownVoltageandDielectricStrengthofInsulatingGasesatCommercialPowerFrequencies1ThisstandardisissuedunderthefixeddesignationD2477;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthedielec-tricbreakdownvoltageanddielectricstrengthofinsulatinggasesusedintransformers,circuitbreakers,cables,andsimilarapparatusasaninsulatingmedium.Thetestmethodisappli-cableonlytogaseswithboilingpointsbelowroomtemperatureatatmosphericpressure.1.2Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3MercuryhasbeendesignatedbyEPAandmanystateagenciesasahazardousmaterialthatcancausecentralnervoussystem,kidneyandliverdamage.Mercury,oritsvapor,maybehazardoustohealthandcorrosivetomaterials.Cautionshouldbetakenwhenhandlingmercuryandmercurycontainingproducts.SeetheapplicableproductMaterialSafetyDataSheet(MSDS)fordetailsandEPA’swebsite—http://www.epa.gov/mercury/faq.htmforadditionalinforma-tion.Usersshouldbeawarethatsellingmercuryand/ormercurycontainingproductsintoyourstatemaybeprohibitedbystatelaw.2.ReferencedDocuments2.1ASTMStandards:2D2864TerminologyRelatingtoElectricalInsulatingLiq-uidsandGases2.2IEEEStandard:3No.4StandardTechniquesforHighVoltageTesting2.3ASTMAdjuncts:Dielectriccellassemblyanddetail(2drawings)43.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD2864.4.SignificanceandUse4.1Thedielectricbreakdownvoltageanddielectricstrengthofaninsulatinggasinauniformfielddependspri...
