1、Designation:D361202(Reapproved 2009)Standard Test Method forAnalysis of Gases Dissolved in Electrical Insulating Oil byGas Chromatography1This standard is issued under the fixed designation D3612;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers three procedures for extractionand measurement of gases dissolved in electri
3、cal insulating oilhaving a viscosity of 20 cSt(100 SUS)or less at 40C(104F),and the identification and determination of the individualcomponent gases extracted.Other methods have been used toperform this analysis.1.2 The individual component gases that may be identifiedand determined include:Hydroge
4、nH2OxygenO2NitrogenN2Carbon monoxideCOCarbon dioxideCO2MethaneCH4EthaneC2H6EthyleneC2H4AcetyleneC2H2PropaneC3H8PropyleneC3H61.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-p
5、riate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificwarning statements see 6.1.8,30.2.2 and 30.3.1.2.Referenced Documents2.1 ASTM Standards:2D2140 Practice for Calculating Carbon-Type Compositionof Insulating Oils of Petroleum OriginD
6、2300 Test Method for Gassing of Electrical InsulatingLiquids Under Electrical Stress and Ionization(ModifiedPirelli Method)D2779 Test Method for Estimation of Solubility of Gases inPetroleum LiquidsD2780 Test Method for Solubility of Fixed Gases in Liquids(Withdrawn 2010)3D3613 Practice for Sampling
7、 Insulating Liquids for GasAnalysis and Determination of Water Content(Withdrawn2007)3D4051 Practice for Preparation of Low-Pressure Gas BlendsE260 Practice for Packed Column Gas Chromatography2.2 IEEE Standard:C 57.104 Guide for the Interpretation of Gases Generated inOil-Immersed Transformers42.3
8、IEC Standard:Publication No.567 Guide for the Sampling of Gases and ofOil from Oil-Filled Electrical Equipment and for theAnalysis of Free and Dissolved Gases53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 gas content of oil by volumein Method A,the totalvolume of gases,correc
9、ted to 760 torr(101.325 kPa)and 0C,contained in a given volume of oil,expressed as a percentage.In Methods B and C,the sum of the individual gas concentra-tions corrected to 760 torr(101.325 kPa)and 0C,expressed inpercent or parts per million.3.1.2 headspacea volume of gas phase in contact with avol
10、ume of oil in a closed vessel.The vessel is a headspace vialof 20-mL nominal capacity.3.1.2.1 DiscussionOther vessel volumes may also beused,but the analytical performance may be somewhat differ-ent than that specified in Method C.3.1.3 parts per million(ppm)by volume of(specific gas)inoilthe volume
11、 of that gas corrected to 760 torr(101.325 kPa)and 0C,contained in 106volume of oil.3.1.4 sparging,vagitating the liquid sample using a gas tostrip other gases free.1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand is the direct responsibi
12、lity of Subcom-mittee D27.03 on Analytical Tests.Current edition approved May 15,2009.Published June 2009.Originallyapproved in 1977.Last previous edition approved in 2002 as D3612 02(2009).DOI:10.1520/D3612-02R09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cust
13、omer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from IEEE,345 E.47th St.,New York,NY 10017.5Available fro
14、m International Electrotechnical Commission(IEC),3 rue deVaremb,Case postale 131,CH-1211,Geneva 20,Switzerland,http:/www.iec.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 volume concentration of(specific gas)in the gassamplethe
15、 volume of the specific gas contained in a givenvolume of the gas sample at the same temperature and pressure(as the measured total volume),expressed either as a percent-age or in parts per million.4.Summary of Test Method4.1 Method ADissolved gases are extracted from a sampleof oil by introduction
16、of the oil sample into a pre-evacuatedknown volume.The evolved gases are compressed to atmo-spheric pressure and the total volume measured.4.2 Method BDissolved gases are extracted from a sampleof oil by sparging the oil with the carrier gas on a strippercolumn containing a high surface area bead.4.3 Method CMethod C consists of bringing an oil samplein contact with a gas phase(headspace)in a closed vesselpurged with argon.The dissolved gases contained in the oil arethen equilibrated in the two