ASTM D3145-2008 Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method《用螺旋形线圈法测试电绝缘清漆耐热性的标准试验方法》.pdf
《ASTM D3145-2008 Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method《用螺旋形线圈法测试电绝缘清漆耐热性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D3145-2008 Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method《用螺旋形线圈法测试电绝缘清漆耐热性的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 3145 08An American National StandardStandard Test Method forThermal Endurance of Electrical Insulating Varnishes by theHelical Coil Method1This standard is issued under the fixed designation D 3145; the number immediately following the designation indicates the year oforiginal adoptio
2、n 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 Department of Defense.1. Sco
3、pe*1.1 This test method covers the determination of the thermalendurance of electrical insulating varnishes alone or in com-binations with magnet wire insulation. Changes in the helicalcoil bond strength are used as the test criteria. The coils aremade from bare aluminum or copper wire, or from film
4、- orfiber-insulated magnet wire.1.2 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 limitati
5、ons prior to use. For a specificprecautionary statement, see Section 7.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.NOTE 1There is
6、 no similar or equivalent IEC standard.2. Referenced Documents2.1 ASTM Standards:2D 1711 Terminology Relating to Electrical InsulationD 1932 Test Method for Thermal Endurance of FlexibleElectrical Insulating VarnishesD 2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet WireD 2519
7、Test Method for Bond Strength of Electrical Insu-lating Varnishes by the Helical Coil TestD 3251 Test Method for Thermal Endurance Characteristicsof Electrical Insulating Varnishes Applied Over Film-Insulated Magnet WireD 3850 Test Method for Rapid Thermal Degradation ofSolid Electrical Insulating M
8、aterials By Thermogravimet-ric Method (TGA)D 5423 Specification for Forced-Convection LaboratoryOvens for Evaluation of Electrical InsulationD 6054 Practice for Conditioning Electrical Insulating Ma-terials for Testing2.2 International Electrotechnical Commission Publica-tions:3IEC 60216-1 Guide for
9、 the Determination of Thermal En-durance Properties of Electrical Insulation Materials (Part1)3. Terminology3.1 Definitions3.1.1 For definitions of terms used in the test method, referto Terminology D 1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 bond strength, na measure of the forc
10、e required toseparate surfaces which have been bonded together.3.2.2 magnet wire, na metal electrical conductor, coveredwith electrical insulation, for use in the assembly of electricalinductive apparatus such as coils for motors, transformers,generators, relays, magnets, etc.3.2.2.1 DiscussionThe e
11、lectrical insulation is usuallycomposed of a film covering formed from a magnet wireenamel applied over a bare conductor. In some specificapplications, fibrous coverings, either taped or linear filamentserved, are also used as electrical insulation.3.2.3 varnish, electrical insulating, n a liquid re
12、sin sys-tem that is applied to and cured on electrical componentsproviding electrical, mechanical and environmental protection.3.2.3.1 DiscussionThere are two types of electrical insu-lating varnishessolvent-containing and solventless. Solvent-containing types are solutions, dispersions or emulsions
13、 of apolymer or a mixture of polymers in a volatile, nonreactableliquid. Solventless types are liquid resin systems free ofvolatile, nonreactable solvents.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibili
14、ty ofSubcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-ing Compounds.Current edition approved May 1, 2008. Published June 2008. Originallyapproved in 1973. Last previous edition approved in 2003 as D 3145 03.2For referenced ASTM standards, visit the ASTM website, www.ast
15、m.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 American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.o
16、rg.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Summary of Test Method4.1 Flexural strength of the helical coils is measured peri-odically after exposure to seve
17、ral exposure temperatures. Thetime to reach an arbitrarily selected value of bond strength ateach exposure temperature is determined. The logarithms ofthese times in hours are plotted as a function of the reciprocaltemperature (1/K) to give an Arrhenius plot.5. Significance and Use5.1 This test meth
18、od is used to determine the effect ofexposure to elevated temperatures on the bond strength ofcombinations of magnet wire insulations and electrical insu-lating varnishes. The results are used as a guide for thecomparison and selection of varnishes and combinations ofvarnishes and magnet wire insula
19、tion for specific applications.Test Methods D 1932, D 3251, and D 3850 describe additionaltests for determining the thermal endurance of insulatingvarnishes. A comprehensive evaluation of thermal characteris-tics includes a comparison of the thermal endurance deter-mined in these different ways.5.2
20、This test method is useful for research and productqualifications purposes.6. Apparatus6.1 Testing Machine, see Test Method D 2519.6.2 Test Fixture, see Test Method D 2519.6.3 Ovens, see Specification D 5423, Type II.7. Hazards7.1 It is unsafe to use varnish at temperatures above flashpoint without
21、adequate ventilation, especially if the possibilityexists that flames or sparks are present. Store varnish in sealedcontainers.8. Test Specimen8.1 Prepare 60 or more specimens for each exposure tem-perature, following the procedure specified in Test MethodD 2519.9. Selection of Test Temperatures9.1
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