ASTM D3251-04(2013)
(Test Method)Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
SIGNIFICANCE AND USE
5.1 Different combinations of varnishes and film-insulated magnet wire behave differently when exposed to elevated temperatures. This includes different varnishes tested with the same film-insulated magnet wire and a single varnish tested with different film-insulated magnet wire.
5.2 This test method is used to determine the effect on the electrical properties of a varnish applied to film-insulated magnet wire when the combination is exposed to prescribed elevated temperatures.
SCOPE
1.1 This test method covers the determination of the thermal endurance characteristics of electrical insulating varnishes and film-insulated magnet wire in combination.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.Note 1—This test method is equivalent to IEC 60172.
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Designation: D3251 − 04 (Reapproved 2013)
Standard Test Method for
Thermal Endurance Characteristics of Electrical Insulating
Varnishes Applied Over Film-Insulated Magnet Wire
This standard is issued under the fixed designation D3251; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Test Method
1.1 Thistestmethodcoversthedeterminationofthethermal
4.1 A varnish is applied to twisted pairs of film-insulated
endurance characteristics of electrical insulating varnishes and
magnet wire and exposed to elevated temperatures. Life test
film-insulated magnet wire in combination.
results are compared to those of unvarnished twisted pairs.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 5. Significance and Use
standard.
5.1 Different combinations of varnishes and film-insulated
1.3 This standard does not purport to address all of the
magnet wire behave differently when exposed to elevated
safety concerns, if any, associated with its use. It is the
temperatures. This includes different varnishes tested with the
responsibility of the user of this standard to establish appro-
same film-insulated magnet wire and a single varnish tested
priate safety and health practices and determine the applica-
with different film-insulated magnet wire.
bility of regulatory limitations prior to use.
5.2 This test method is used to determine the effect on the
NOTE 1—This test method is equivalent to IEC 60172.
electrical properties of a varnish applied to film-insulated
magnet wire when the combination is exposed to prescribed
2. Referenced Documents
elevated temperatures.
2.1 ASTM Standards:
D115 Test Methods for Testing Solvent Containing Var-
6. Hazards
nishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation 6.1 It is unsafe to use varnish at temperatures above the
D2307 Test Method for Thermal Endurance of Film-
flash point without adequate ventilation, especially if the
Insulated Round Magnet Wire
possibility exists that flames or sparks are present. Store
2.2 IEC Standard: varnish in sealed containers. This also applies to specified
IEC 60172 Test Procedure for the determination of the reagents and solvents. (Warning—Lethal voltages are a po-
temperature index of enameled winding wires
tential hazard during the performance of this test. It is essential
thatthetestapparatus,andallassociatedequipmentelectrically
3. Terminology
connected to it, be properly designed and installed for safe
operation. Solidly ground all electrically conductive parts
3.1 Definitions:
which it is possible for a person to contact during the test.
3.1.1 For definitions of terms used in this test method refer
Provide means for use at the completion of any test to ground
to Terminology D1711.
any parts which were at high voltage during the test or have the
potential for acquiring an induced charge during the test or
This test method is under the jurisdiction of ASTM Committee D09 on
retaining a charge even after disconnection of the voltage
Electrical and Electronic Insulating Materials and is the direct responsibility of
source. Thoroughly instruct all operators as to the correct
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
procedures for performing tests safety. When making high
ing Compounds.
Current edition approved April 1, 2013. Published April 2013. Originally
voltage tests, particularly in compressed gas or in oil, it is
approved in 1973. Last previous edition approved in 2009 as D3251 – 04 (2009).
possiblefortheenergyreleasedatbreakdowntobesufficientto
DOI: 10.1520/D3251-04R13.
2 result in fire, explosion, or rupture of the test chamber. Design
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
test equipment, test chambers, and test specimens so as to
Standards volume information, refer to the standard’s Document Summary page on
minimize the possibility of such occurrences and to eliminate
the ASTM website.
3 the possibility of personal injury. If the potential for fire exists,
Available from American National Standards Association, 25 W. 43rd St., 4th
Floor, New York, NY 10036. have fire suppression equipment available.)
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