ASTM_D_150_-_18.pdf

Designation:D15018Standard Test Methods forAC Loss Characteristics and Permittivity(DielectricConstant)of Solid Electrical Insulation1This standard is issued under the fixed designation D150;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the determination of relativepermittivity,dissipation factor,loss index,power factor,phaseangle,and loss angle of specimens of solid electrical insulatingmaterials when the standards used are lumped impedances.Thefrequency range addressed extends from less than 1 Hz toseveral hundred megahertz.NOTE1In common usage,the word relative is frequently dropped.1.2 These test methods provide general information on avariety of electrodes,apparatus,and measurement techniques.A reader interested in issues associated with a specific materialneeds to consult ASTM standards or other documents directlyapplicable to the material to be tested.2,31.3 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-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see 10.2.1.1.4 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:4D374 Test Methods for Thickness of Solid Electrical Insu-lation(Metric)D0374_D0374MD618 Practice for Conditioning Plastics for TestingD1531 Test Methods for Relative Permittivity(DielectricConstant)and Dissipation Factor by Fluid DisplacementProcedures(Withdrawn 2012)5D1711 Terminology Relating to Electrical InsulationD5032 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Glycerin SolutionsE104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Solutions3.Terminology3.1 Definitions:3.1.1 Use Terminology D1711 for definitions of terms usedin these test methods and associated with electrical insulationmaterials.3.2 Definitions of Terms Specific to This Standard:3.2.1 capacitance,C,nthat property of a system ofconductors and dielectrics which permits the storage of elec-trically separated charges when potential differences existbetween the conductors.3.2.1.1 DiscussionCapacitance is the ratio of a quantity,q,of electricity to a potential difference,V.Acapacitance value isalways positive.The units are farads when the charge isexpressed in coulombs and the potential in volts:C 5 q/V(1)3.2.2 dissipation factor,(D),(loss tangent),(tan),ntheratio of the loss index()to the relative permittivity()whichis equal to the tangent of its loss angle()or the cotangent ofits phase angle()(see Fig.1 and Fig.2).D 5/(2)1These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved May 1,2018.Published May 2018.Originallyapproved in 1922.Last previous edition approved in 2011 as D150 11.DOI:10.1520/D0150-18.2R.Bartnikas,Chapter 2,“Alternating-Current Loss and PermittivityMeasurements,”Engineering Dielectrics,Vol.IIB,Electrical Properties of SolidInsulating Materials,Measurement Techniques,R.Bartnikas,Editor,STP 926,ASTM,Philadelphia,1987.3R.Bartnikas,Chapter 1,“Dielectric Loss in Solids,”Engineering Dielectrics,Vol IIA,Electrical Properties of Solid Insulating Materials:Molecular Structure andElectrical Behavior,R.Bartnikas and R.M.Eichorn,Editors,STP 783,ASTMPhiladelphia,1983.4For 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.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright 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.1 3.2.2.1 Discussiona:D 5 tan 5 cot 5 Xp/Rp5 G/Cp5 1/CpRp(3)where:G=equivalent ac conductance,Xp=parallel reactance,Rp=equivalent a