1、Designation: D 5637 05An American National StandardStandard Test Method forMoisture Resistance of Electrical Insulating Varnishes1This standard is issued under the fixed designation D 5637; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the mechanical performance ofelectrical insulating varnishes subjected to
3、high humidityconditions.1.2 The values stated in SI units are to be regarded asstandard.1.3 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 and health practices
4、 and determine the applica-bility of regulatory limitations prior to use. See 7.1.NOTE 1There is not ISO or IEC equivalent.2. Referenced Documents2.1 ASTM Standards:2D 2519 Test Method for Bond Strength of Electrical Insu-lating Varnishes by the Helical Coil Test2.2 IEEE Standard:IEEE 117 Standard T
5、est Procedure for Evaluation of Sys-tems of Insulating Materials for Randon-Wound AC Elec-tric Machinery33. Terminology3.1 See Test Method D 2519.4. Summary of Test Method4.1 Flexural strength tests are made on varnish-treatedhelical coils to determine the force required to break the coilunder speci
6、fied conditions both before and after exposure tohigh humidity conditions.5. Significance and Use5.1 This test method is useful for the evaluation of insulat-ing varnish performance in high humidity exposure.6. Apparatus6.1 Tensile Testing MachineSee Test Method D 2519.6.2 Test FixtureSee Test Metho
7、d D 2519.6.3 Exposure ChamberA chamber capable of maintaininga minimum of 100 % relative humidity with condensation, at30 6 1 C.NOTE 2The exposure chamber described in IEEE 117 has been foundsuitable.7. Safety Precautions7.1 It is unsafe to use liquid varnish at temperatures abovethe flash point wit
8、hout adequate ventilation, especially if thepossibility exists that flames or sparks are present. Storevarnish in sealed containers.8. Test Specimens8.1 Prepare a minimum of ten test specimens in accordancewith Test Method D 2519 using a wire mutually agreed uponby interested parties.9. Procedure9.1
9、 Condition half of the test specimens in the exposurechamber maintaining a minimum of 98 % relative humidity for336 6 1h.9.2 Test specimens both conditioned and unconditioned asdescribed in Test Method D 2519 at standard laboratoryconditions. If possible, test conditioned specimens in theexposure ch
10、amber. When specimens are not tested in theexposure chamber, they should be removed one at a time fromthe chamber and tested as soon as possible. The time afterremoval from the chamber and room conditions will possiblyaffect test results. Take care to minimize any change inhumidity within the cabine
11、t during testing.10. Report10.1 Report the following information:10.1.1 Description of varnish,10.1.2 Identification of wire used,1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01
12、on Electrical Insulating Varnishes, Powders, and Encapsu-lating Compounds.Current edition approved September 1, 2005. Published September 2005.Originally approved in 1994. Last previous edition approved in 2004 asD 5637 04.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orconta
13、ct 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 Institute of Electrical and Electronics Engineers, Inc., 3 ParkAvenue, 17thFloor, New York, NY 10017.1Copyright ASTM Inter
14、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.10.1.3 Cure time and temperature and number of dips usedto prepare the coils,10.1.4 Average bond strength in newtons (pounds-force) ofunconditioned coils,10.1.5 Average bond strength in newtons (pounds-forc
15、e) ofconditioned coils, and10.1.6 Percent retention of bond strength after conditioning:Percent retained bond strength 5average bond strength conditioned!average bond strength unconditioned!3 100 (1)11. Precision and Bias11.1 PrecisionNo information has been presented toASTM upon which to base a sta
16、tement of precision. Noactivity has been planned to develop such information.11.2 BiasThis test method has no bias because the valuefor moisture resistance is determined solely in terms of this testmethod itself.12. Keywords12.1 bond strength; helical coils; moisture resistance;varnishASTM Internati
17、onal takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely thei
18、r own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should b
19、e addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standard
20、s, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D5637052
