ASTM_D_149_-_09_2013.pdf

Designation:D14909(Reapproved 2013)Standard Test Method forDielectric Breakdown Voltage and Dielectric Strength ofSolid Electrical Insulating Materials at Commercial PowerFrequencies1This standard is issued under the fixed designation D149;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.Scope*1.1 This test method covers procedures for the determina-tion of dielectric strength of solid insulating materials atcommercial power frequencies,under specified conditions.2,31.2 Unless otherwise specified,the tests shall be made at 60Hz.However,this test method is suitable for use at anyfrequency from 25 to 800 Hz.At frequencies above 800 Hz,dielectric heating is a potential problem.1.3 This test method is intended to be used in conjunctionwith any ASTM standard or other document that refers to thistest method.References to this document need to specify theparticular options to be used(see 5.5).1.4 It is suitable for use at various temperatures,and in anysuitable gaseous or liquid surrounding medium.1.5 This test method is not intended for measuring thedielectric strength of materials that are fluid under the condi-tions of test.1.6 This test method is not intended for use in determiningintrinsic dielectric strength,direct-voltage dielectric strength,or thermal failure under electrical stress(see Test MethodD3151).1.7 This test method is most commonly used to determinethe dielectric breakdown voltage through the thickness of a testspecimen(puncture).It is also suitable for use to determinedielectric breakdown voltage along the interface between asolid specimen and a gaseous or liquid surrounding medium(flashover).With the addition of instructions modifying Sec-tion 12,this test method is also suitable for use for prooftesting.1.8 This test method is similar to IEC Publication 243-1.Allprocedures in this method are included in IEC 243-1.Differ-ences between this method and IEC 243-1 are largely editorial.1.9 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 determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in Section 7.Also see 6.4.1.2.Referenced Documents2.1 ASTM Standards:4D374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)5D618 Practice for Conditioning Plastics for TestingD877 Test Method for Dielectric Breakdown Voltage ofInsulating Liquids Using Disk ElectrodesD1711 Terminology Relating to Electrical InsulationD2413 Practice for Preparation of Insulating Paper andBoard Impregnated with a Liquid DielectricD3151 Test Method for Thermal Failure of Solid ElectricalInsulating Materials Under Electric Stress(Withdrawn2007)5D3487 Specification for Mineral Insulating Oil Used inElectrical ApparatusD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical Insulation1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1922.Last previous edition approved in 2009 as D149 09.DOI:10.1520/D0149-09R13.2Bartnikas,R.,Chapter 3,“High Voltage Measurements,”Electrical Propertiesof Solid Insulating Materials,Measurement Techniques,Vol.IIB,EngineeringDielectrics,R.Bartnikas,Editor,ASTM STP 926,ASTM,Philadelphia,1987.3Nelson,J.K.,Chapter 5,“Dielectric Breakdown of Solids,”ElectricalProperties of Solid Insulating Materials:Molecular Structure and ElectricalBehavior,Vol.IIA,Engineering Dielectrics,R.Bartnikas and R.M.Eichorn,Editors,ASTM STP 783,ASTM,Philadelphia,19834For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.2 IEC Standard:Pub.243-1 Methods of Test for Electrical Strength of SolidInsulating MaterialsPart 1:Tests at Power Frequencies62.3 ANSI Standard:C68.1 Techniques for Dielectric Tests,IEEE Standard No.473.Terminology3.1 Definitions:3.1.1 dielectric breakdown voltage(electric breakdownvoltage),nthe potential difference at which dielectric failureoccurs under prescribed conditions in a