ASTM D3251-03
(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
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 the 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. For specific hazard statements, see Section .
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An American National Standard
Designation: D 3251 – 03
Standard Test Method for
Thermal Endurance Characteristics of Electrical Insulating
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Varnishes Applied Over Film-Insulated Magnet Wire
This standard is issued under the fixed designation D 3251; 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.
1. Scope 4. Summary of Test Method
1.1 This test method covers the determination of the thermal 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 the
5. Significance and Use
standard.
5.1 Individual varnishes may behave differently when ap-
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the plied to the same film-insulated magnet wire and aged at
elevated temperatures. Likewise, a varnish may not behave the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- same when applied to different types of film-insulated magnet
wires and aged at elevated temperatures.
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 6. 5.2 This test method is used to determine the effect on the
electrical properties of a varnish applied to film-insulated
NOTE 1—This test method is equivalent to IEC 60172.
magnet wire when the combination is exposed to prescribed
elevated temperatures.
2. Referenced Documents
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2.1 ASTM Standards:
6. Safety Precautions
D 115 Test Methods for Testing Solvent Containing Var-
6.1 It is unsafe to use varnish at temperatures above the
nishes Used for Electrical Insulation
flash point without adequate ventilation, especially if the
D 1711 Terminology Relating to Electrical Insulation
possibility exists that flames or sparks are present. Store
D 2307 Test Method for Relative Thermal Endurance of
varnish in sealed containers. This also applies to specified
Film-Insulated Round Magnet Wire
reagents and solvents.
2.2 IEC Standard:
(Warning—Lethal voltages are a potential hazard during the
IEC 60172 Test Procedure for the determination of the
performance of this test. It is essential that the test apparatus,
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temperature index of enameled winding wires
and all associated equipment electrically connected to it, be
properly designed and installed for safe operation. Solidly
3. Terminology
ground all electrically conductive parts which it is possible for
3.1 Definitions:
a person to contact during the test. Provide means for use at the
3.1.1 For definitions of terms used in this test method refer
completion of any test to ground any parts which were at high
to Terminology D 1711.
voltage during the test or have the potential for acquiring an
induced charge during the test or retaining a charge even after
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disconnection of the voltage source. Thoroughly intruct all
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
operators as to the correct procedures for performing tests
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
safety. When making high voltage tests, particularly in com-
lating Compounds.
pressed gas or in oil, it is possible for the energy released at
Current edition approved Oct. 1, 2003. Published November 2003. Originally
approved in 1973. Last previous edition approved in 1999 as D 3251 – 99. breakdown to be sufficient to result in fire, explosion, or
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
rupture of the test chamber. Design test equipment, test
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
chambers, and test specimens so as to minimize the possibility
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D3251–03
of such occurrences and to eliminate the possibility of personal 9.2.2 Solventless Varnishes
injury. If the potential for fire exists, have fire suppression 9.2.2.1 Test solventless varnishes in the “as made” condi-
equipment
...
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