1、Designation:D92415Standard Test Method forDissipation Factor(or Power Factor)and RelativePermittivity(Dielectric Constant)of Electrical InsulatingLiquids1This standard is issued under the fixed designation D924;the number immediately following the designation indicates the year oforiginal adoption o
2、r,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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1
3、This test method describes testing of new electricalinsulating liquids as well as liquids in service or subsequent toservice in cables,transformers,oil circuit breakers,and otherelectrical apparatus.1.2 This test method provides a procedure for makingreferee tests at a commercial frequency of betwee
4、n 45 and 65Hz.1.3 Where it is desired to make routine determinationsrequiring less accuracy,certain modifications to this testmethod are permitted as described in Sections 16 to 24.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstand
5、ard.1.5 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 and health practices and to determine theapplicability of regulatory limitations prior to use.Specificwarni
6、ngs are given in 11.3.3.1.6 Mercury has been designated by the EPA and many stateagencies as a hazardous material that can cause nervoussystem,kidney and liver damage.Mercury,or its vapor,may behazardous to health and corrosive to materials.Caution shouldbe taken when handling mercury and mercury co
7、ntainingproducts.See the applicable product Material Safety DataSheet(MSDS)for details and the EPAs website:http:/www.epa.gov/mercury/faq.htm for additional information.Us-ers should be aware that selling mercury and/or mercurycontaining products into your state may be prohibited by statelaw.2.Refer
8、enced Documents2.1 ASTM Standards:2D150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD923 Practices for Sampling Electrical Insulating LiquidsD2864 Terminology Relating to Electrical Insulating Liq-uids and GasesD2865 Practice for Calib
9、ration of Standards and Equipmentfor Electrical Insulating Materials TestingE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 IEEE Standard:Standard 4 IEEE Standard Techniques for High-VoltageTesting33.Terminology3.1 DefinitionsDefinitions of terms u
10、sed in this testmethod are given in Terminology D2864.Also refer to TestMethods D150 for detailed discussion of terms.4.Significance and Use4.1 Dissipation Factor(or Power Factor)This is a mea-sure of the dielectric losses in an electrical insulating liquidwhen used in an alternating electric field
11、and of the energydissipated as heat.A low dissipation factor or power factorindicates low ac dielectric losses.Dissipation factor or powerfactor may be useful as a means of quality control,and as anindication of changes in quality resulting from contaminationand deterioration in service or as a resu
12、lt of handling.4.1.1 The loss characteristic is commonly measured interms of dissipation factor(tangent of the loss angle)or ofpower factor(sine of the loss angle)and may be expressed asa decimal value or as a percentage.For decimal values up to1This test method is under the jurisdiction of ASTM Com
13、mittee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.05 on Electrical Test.Current edition approved Oct.1,2015.Published November 2015.Originallyapproved in 1947 as D924 47 T.Last previous edition approved in 2008 asD924 08.DOI:10.1520/D0924-15.2
14、For 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 Institute of Electrical and Electronic Engineers,44
15、5 Hoes Lane,Piscataway,NJ 08854,www.ieee.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 0.05,dissipation factor and power factor values are equal toeach other within about one part in one thousand.In general,since the dissipation fac
16、tor or power factor of insulating oils ingood condition have decimal values below 0.005,the twomeasurements(terms)may be considered interchangeable.4.1.2 The exact relationship between dissipation factor(D)and power factor(PF)is given by the following equations:PF5D=11D2D 5PF=1 2PF!2(1)The reported value of D or PF may be expressed as adecimal value or as a percentage.For example:D or PF at 25C 5 0.002 or 0.2%(2)4.2 Relative Permittivity(Dielectric Constant)Insulatingliquids are used in general
