ASTM_D_7150_-_13_2020.pdf

Designation:D715013(Reapproved 2020)Standard Test Method for theDetermination of Gassing Characteristics of InsulatingLiquids Under Thermal Stress1This standard is issued under the fixed designation D7150;the number immediately following the designation indicates the year oforiginal adoption or,in the case of 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 describes the procedures to determinethe gassing characteristics due to thermal stress at 120C ofinsulating liquids specifically and without the influence ofother electrical apparatus materials or electrical stresses.Thistest method was primarily designed for insulating mineral oil.It can be applied to other insulating liquids in which dissolvedgas-in-oil analysis(Test Method D3612)is commonly per-formed.1.2 This test method is particularly suited for detection ofthe phenomenon sometimes known as“stray gassing”and isalso referred to in CIGRE TF11 B39.1.3 This test method is performed on transformer insulatingliquids to determine the propensity of the oil to produce certaingases such as hydrogen and hydrocarbons at low temperatures.1.4 This test method details two procedures:1.5 Method A describes the procedure for determining thegassing characteristics of insulating liquids,at 120C for 164 h.1.6 Method B describes the procedure for processing theinsulating liquid through an attapulgite clay column to removeorganic contaminants and other reactive groups that mayinfluence the gassing behavior of an insulating liquid,which issuspected of being contaminated.This procedure applies toboth new and used insulating liquids.1.7 The values stated in SI units are to be regarded asstandard.English units are used when there is no metricequivalent.1.8 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-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1933 Specification for Nitrogen Gas as an Electrical Insu-lating MaterialD3612 Test Method for Analysis of Gases Dissolved inElectrical Insulating Oil by Gas Chromatography2.2 IEEE Document:3C 57.104 IEEE Guide for the Interpretation of Gases Gen-erated in Oil-Immersed Transformers,20082.3 IEC Documents:4IEC 60599 Mineral oil-impregnated electrical equipment inservice Guide to the interpretation of dissolved and freegases analysis,2007IEC 61464 Guide for the interpretation of dissolved gasanalysis(DGA)in bushings where oil is the impregnatingmedium of the main insulation(generally paper),1998CIGRE TF11 B39 Gas formation tendency test for mineraltransformer oils,20023.Terminology3.1 Definitions:3.1.1 stray gassing,nthe production of gases in an insu-lating liquid due to heating,contamination or in combination.3.1.2 Fullers Earth,nhighly adsorbent clay-like sub-stance consisting mainly of hydrated aluminum silicates withthe main minerals being montmorillonite,kaolinite,attapulgiteand palygorskite.1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.03 on Analytical Tests.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 2005.Last previous edition approved in 2013 as D7150-13.DOI:10.1520/D7150-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from the Institute of Electrical and Electronic Engineers,Inc,(IEEE),445 Hoes Lane,Piscataway,NJ 08854;www.ieee.org4Available from the International Electrotechnical Commission,3,rue deVaremb,P.O.Box 131 CH-1211,Geneva 20,Switzerland;www.iec.chCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.4.Summary of Test Method4.1 Method AInsulating liquid is filtered through a mixedcellulose ester filter.A portion of the test specimen is spargedfor 30 min with dry air.A test specimen is then pl