ASTM D1932-01
(Test Method)Standard Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
Standard Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
SCOPE
1.1 This test method covers the determination of the relative thermal endurance of flexible electrical insulating varnishes by determining the aging time necessary at elevated temperatures to decrease the dielectric breakdown of the varnish to an arbitrarily selected value when applied to a standard glass fiber fabric.
1.2 This test method does not apply to varnishes that lose a high percentage of their dielectric breakdown voltage when flexed before aging as prescribed in the screening test (Section 9). Examples of such varnishes are those used for high speed armatures and laminated structures. Also, this test method is not applicable to varnishes which distort sufficiently during thermal aging so that they cannot be tested using the curved electrode assembly.
1.3 Thermal endurance is expressed in terms of a temperature index.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 7.
1.5 The values stated in SI units are the standard.
Note 1--There is no equivalent IEC or ISO standard.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 1932 – 01
Standard Test Method for
Thermal Endurance of Flexible Electrical Insulating
1
Varnishes
This standard is issued under the fixed designation D 1932; the number immediately following the designation indicates the year of
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 (e) 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 D 580 Specification for Greige Woven Glass Tapes and
3
Webbings
1.1 This test method covers the determination of the relative
D 1346 Methods of Testing Electrical Insulating Varnishes
thermal endurance of flexible electrical insulating varnishes by
4
for 180°C and Above
determining the aging time necessary at elevated temperatures
2
D 1711 Terminology Relating to Electrical Insulation
to decrease the dielectric breakdown of the varnish to an
D 2518 Specification for Woven Glass Fabrics for Electrical
arbitrarily selected value when applied to a standard glass fiber
5
Insulation
fabric.
D 5423 Specification for Forced-Convection Laboratory
1.2 This test method does not apply to varnishes that lose a
5
Ovens for Evaluation of Electrical Insulation
high percentage of their dielectric breakdown voltage when
D 6054 Practice for Conditioning Electrical Insulating Ma-
flexed before aging as prescribed in the screening test (Section
5
terials for Testing
9). Examples of such varnishes are those used for high speed
6
2.2 IEEE Publications:
armatures and laminated structures. Also, this test method is
IEEE No. 101A Guide for the Statistical Analysis of Ther-
not applicable to varnishes which distort sufficiently during
mal Life Test Data (including Appendix A)
thermal aging so that they cannot be tested using the curved
2.3 IEC Publications:
electrode assembly.
IEC 60216 Guide for the Determination of Thermal Endur-
1.3 Thermal endurance is expressed in terms of a tempera-
7
ance Properties of Electrical Insulating Materials (Part 1)
ture index.
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions:
responsibility of the user of this standard to establish appro-
3.1.1 temperature index (TI), n—a number which permits
priate safety and health practices and determine the applica-
comparison of the temperature/time characteristics of an elec-
bility of regulatory limitations prior to use. For specific hazard
trical insulating material, or a simple combination of materials,
statements, see Section 7.
based on the temperature in degrees Celsius which is obtained
1.5 The values stated in SI units are the standard.
by extrapolating the Arrhenius plot of life versus temperature
NOTE 1—There is no equivalent IEC or ISO standard.
to a specified time, usually 20 000 h.
3.1.2 thermal endurance graph, n—an Arrhenius plot.
2. Referenced Documents
3.1.3 thermal life, n—the time necessary for a specific
2.1 ASTM Standards:
property of a material, or a simple combination of materials, to
D 149 Test Method for Dielectric Breakdown Voltage and
degrade to a defined end point when aged at a specified
Dielectric Strength of Solid Electrical Insulating Materials
temperature.
2
at Commercial Power Frequencies
3.1.4 thermal life curve, n—a graphical representation of
D 374 Test Methods for Thickness of Solid Electrical Insu-
thermal life at a specified aging temperature in which the value
2
lation
of a property of a material, or a simple combination of
materials, is measured at room temperature and the values
1 3
This test method is under the jurisdiction of ASTM Committee D09 on Annual Book of ASTM Standards, Vol 07.01.
4
Electrical and Electronic Insulating Materials and is the direct responsibility of Discontinued; see 1986 Annual Book of ASTM Standards, Vol 10.01.
5
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu- Annual Book of ASTM Standards, Vol 10.02.
6
lating Compounds. Available from the Institute of Electrical and Electronics Engineers, 1828 L St.,
Current edition approved Sept. 10, 2001. Published November 2001. Originally NW, Suite 1202, Washington, DC 20036–5104.
7
published as D 1932 – 67. Last previous edition D 1932 – 97. Available from American National Standards Institute, 25 West 43rd St., 4th
2
Annual Book of ASTM Standards, Vol 10.01. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.