ASTM_A_697_-_A_697M_-_13.pdf

Designation:A697/A697M13Standard Test Method forAlternating Current Magnetic Properties of Laminated CoreSpecimen Using Voltmeter-Ammeter-Wattmeter Methods1This standard is issued under the fixed designation A697/A697M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of several acmagnetic properties of laminated cores made from flat-rolledmagnetic materials.1.2 This test method covers test equipment and proceduresfor the determination of impedance permeability and excitingpower from voltage and current measurements,and core lossfrom wattmeter measurements.These tests are made underconditions of sinusoidal flux.1.3 This test method covers tests for two general categories(1 and 2)of cores based on size and application.1.4 Tests are provided for power and control size cores(Category 1)operating at inductions of 10 to 15 kG 1.0 to 1.5T and at frequencies of 50,60,and 400 Hz.1.5 Procedures and tests are provided for coupling andmatching type transformer cores(Category 2)over the range ofinductions from 100 G 0.01 T or lower to 10 kG 1.0 T andabove at 50 to 60 Hz or above when covered by suitableprocurement specifications.1.6 This test method also covers tests for core loss and acimpedance permeability under incremental test conditions(acmagnetization superimposed on dc magnetization)for theabove core types and at inductions up to those that cause the acexciting current to become excessively distorted or reachvalues that exceed the limits of the individual test equipmentcomponents.1.7 This test method shall be used in conjunction withPractice A34/A34M and Terminology A340.It depends uponthese designated documents for detailed information whichwill not be repeated in this test method.1.8 The values and equations stated in customary(cgs-emuand inch-pound)or SI units are to be regarded separately asstandard.Within this standard,SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with this standard.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.2.Referenced Documents2.1 ASTM Standards:2A34/A34M Practice for Sampling and Procurement Testingof Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic Testing3.Terminology3.1 The terms and symbols listed below apply only to thistest method.The official list of symbols and definitions may befound in Terminology A340.3.2 Symbols:As=E lamination surface area,one side only,Ass=EI lamination surface area,one side only,h=lamination stack height,Adc=dc ammeter,Idc=dc current,N1=primary turns,N2=secondary turns,N3=tertiary turns,R1=ammeter shunt resistance,Vf=flux voltmeter,w=lamination center leg width,W=wattmeter,andZ=choke coil impedance.4.Summary of Test Method4.1 For Category 1 cores,the recommended tests are madeat a frequency of 60 Hz and at a test induction within the rangefrom 10 through 15 kG 1.0 to 1.5 T.1This test method is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.01 on TestMethods.Current edition approved Nov.1,2013.Published November 2013.Originallyapproved in 1974.Last previous edition approved in 2008 as A697/A697M 03(2008).DOI:10.1520/A0697_A0697M-13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 For Category 2 cores,the recommended tests are madeat a frequency of 50 or 60 Hz and at inductions of 40,100 or200,2000,5000,6000,7000,and 10 000 G 0.004,0.01 or0.02,0.2,0.5,0.6,0.7,and 1.0 T.Any or all may be requireddepending on the type of core material.5.Significance and Use5.1 This test method was developed for evaluating the acmagnetic properties of laminated cores made from flat-rolledmagnetic materials.5.2 The reproducibility and repeatability of this test methodare such that this test method is suitable for design,specifica-tion acceptance,service evaluation,and research and develop-ment.6.Apparatus6.1 The apparatus for testing under this test method shallconsist of as many of the following components,described in6.2 through 6.12,as required to perform the desired testmeasu