ASTM D1932-2004(2009) Standard Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes《柔性电绝缘漆耐热性的标准试验方法》.pdf
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1、Designation: D1932 04 (Reapproved 2009)An American National StandardStandard Test Method forThermal Endurance of Flexible Electrical InsulatingVarnishes1This standard is issued under the fixed designation D1932; the number immediately following the designation indicates the year oforiginal adoption
2、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. Scope
3、1.1 This test method covers the determination of the relativethermal endurance of flexible electrical insulating varnishes bydetermining the time necessary at elevated temperatures todecrease the dielectric breakdown of the varnish to an arbi-trarily selected value when applied to a standard glass f
4、iberfabric.1.2 This test method does not apply to varnishes that lose ahigh percentage of their dielectric breakdown voltage whenflexed before elevated temperature exposure as prescribed inthe screening test (Section 9). Examples of such varnishes arethose used for high speed armatures and laminated
5、 structures.Also, this test method is not applicable to varnishes whichdistort sufficiently during thermal elevated temperature expo-sure so that they cannot be tested using the curved electrodeassembly.1.3 Thermal endurance is expressed in terms of a tempera-ture index.1.4 The values stated in SI u
6、nits are to be regarded asstandard. No other units of measurement are included in thisstandard.NOTE 1There is no equivalent IEC or ISO standard.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 standa
7、rd to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements, see Section 7.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid
8、Electrical Insulating Materialsat Commercial Power FrequenciesD374 Test Methods for Thickness of Solid Electrical Insu-lationD580 Specification for Greige Woven Glass Tapes andWebbingsD1346 Methods of Testing Electrical Insulating Varnishesfor 180C and Above3D1711 Terminology Relating to Electrical
9、InsulationD2518 Specification for Woven Glass Fabrics for ElectricalInsulationD5423 Specification for Forced-Convection LaboratoryOvens for Evaluation of Electrical InsulationD6054 Practice for Conditioning Electrical Insulating Ma-terials for Testing2.2 IEEE Publications:4IEEE No. 101A Guide for th
10、e Statistical Analysis of Ther-mal Life Test Data (including Appendix A)2.3 IEC Publications:IEC 60216 Guide for the Determination of Thermal Endur-ance Properties of Electrical Insulating Materials (Part 1)53. Terminology3.1 Definitions:3.1.1 temperature index (TI), na number which permitscompariso
11、n of the temperature/time characteristics of an elec-trical insulating material, or a simple combination of materials,based on the temperature in degrees Celsius which is obtainedby extrapolating the Arrhenius plot of endpoint time versustemperature to a specified time, usually 20 000 h.3.1.2 therma
12、l endurance graph, nan Arrhenius plot.3.1.3 thermal endpoint time, nthe time necessary for aspecific property of a material, or a simple combination ofmaterials, to degrade to a defined end point when aged at aspecified temperature.1This test method is under the jurisdiction of ASTM Committee D09 on
13、Electrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-ing Compounds.Current edition approved Oct. 1, 2009. Published February 2010. Originallyapproved in 1967. Last previous edition approved in
14、 2004 as D1932 04. DOI:10.1520/D1932-04R09.2For 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.3Withdrawn.4Availa
15、ble from the Institute of Electrical and Electronics Engineers, 1828 L St.,NW, Suite 1202, Washington, DC 200365104.5Available from American National Standards Institute, 25 West 43rd St., 4thFloor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohock
16、en, PA 19428-2959, United States.3.1.4 thermal life endpoint time, na graphical representa-tion of thermal endpoint time at a specified exposure tempera-ture in which the value of a property of a material, or a simplecombination of materials, is measured at room temperature andthe values plotted as
17、a function of time.3.1.5 Refer to Terminology D1711 for definitions of otherterms.4. Summary of Test Method4.1 Specimens are prepared using glass cloth coated withthe selected varnish to a specified build.4.2 Specimens are exposed in air at a minimum of threetemperatures above the expected use tempe
18、rature of the mate-rial. Dielectric breakdown voltage tests in air at room tempera-ture are periodically made to determine the exposure time ateach test temperature required to reduce the breakdown voltageto a value of 12 kV/mm (300 V/mil) of original thickness.These values are used to construct a t
19、hermal endurance graphby which temperature indices may be estimated.4.3 This test method is not applicable to materials having aninitial dielectric breakdown voltage of less than 12 kV/mm(300 V/mil) of original thickness unless lower endpoint valuesare agreed upon or indicated in the applicable mate
20、rial speci-fications.5. Significance and Use5.1 A major factor affecting the long term performance ofinsulating materials is thermal degradation. Other factors, suchas moisture and vibration, may cause failures after the materialhas been weakened by thermal degradation.5.2 An electrical insulating v
21、arnish is effective in protectingelectrical equipment only as long as it retains its physical andelectrical integrity.5.3 The thermal degradation of the varnish results in weightloss, porosity, crazing, and generally a reduction in flexibility.Degradation of the varnish can be detected by a decrease
22、 indielectric strength, which is therefore used as the failurecriterion for this test method.5.4 Electrical insulating varnishes undergo flexing in ser-vice due to vibration and thermal expansion. For this reason,this functional test includes flexing and elongation of theinsulation. The electrodes u
23、sed in this test method are designedto elongate the outer surface of the specimen 2 % with respectto the neutral axis of the base fiber while being tested fordielectric breakdown.6. Apparatus6.1 Electrode Test FixtureThe fixture shall be in accor-dance with the dimensions shown in Fig. 1 and Fig. 2.
24、Electrodes shall be of polished brass, with the upper electrodehaving a mass of 1.8 6 0.05 kg (4.0 6 0.1 lb).6.2 Dielectric Breakdown Test SetThe set shall meet therequirements of Test Method D149.6.3 OvensA forced draft constant-temperature oven con-forming to Specification D5423, Type II.6.4 Micro
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