ASTM D3251-99
(Test Method)Standard Test Method for Thermal-Aging Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
Standard Test Method for Thermal-Aging Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
SCOPE
1.1 This test method covers the determination of the thermal-aging 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 5.
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Designation: D 3251 – 99 An American National Standard
Standard Test Method for
Thermal-Aging Characteristics of Electrical Insulating
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 5. Significance and Use
1.1 This test method covers the determination of the 5.1 Individual varnishes may behave differently when ap-
thermal-aging characteristics of electrical insulating varnishes plied to the same film-insulated magnet wire and aged at
and film-insulated magnet wire in combination. elevated temperatures. Likewise, a varnish may not behave the
1.2 The values stated in SI units are to be regarded as the same when applied to different types of film-insulated magnet
standard. wires and aged at elevated temperatures.
1.3 This standard does not purport to address all of the 5.2 This test method is used to determine the effect on the
safety concerns, if any, associated with its use. It is the electrical properties of a varnish applied to film-insulated
responsibility of the user of this standard to establish appro- magnet wire and the combination aged at prescribed elevated
priate safety and health practices and determine the applica- temperatures.
bility of regulatory limitations prior to use. For specific hazard
6. Safety Precautions
statements, see Section 6.
6.1 It is unsafe to use varnish at temperatures above the
NOTE 1—This test method is equivalent to IEC 60172.
flash point without adequate ventilation, especially if the
possibility exists that flames or sparks are present. Store
2. Referenced Documents
varnish in sealed containers. This also applies to specified
2.1 ASTM Standards:
reagents and solvents.
D 115 Test Methods for Testing Solvent Containing Var-
2 Warning—Lethal voltages are a potential hazard during the
nishes Used for Electrical Insulation
performance of this test. It is essential that the test apparatus,
D 1711 Terminology Relating to Electrical Insulation
and all associated equipment electrically connected to it, be
D 2307 Test Method for Relative Thermal Endurance of
properly designed and installed for safe operation. Solidly
Film-Insulated Round Magnet Wire
ground all electrically conductive parts which it is possible for
2.2 IEC Standard:
a person to contact during the test. Provide means for use at
IEC 60172 Test Procedure for the determination of the
3 the completion of any test to ground any parts which were at
temperature index of enameled winding wires
high voltage during the test or have the potential for acquiring
an induced charge during the test or retaining a charge even
3. Terminology
after disconnection of the voltage source. Thoroughly intruct
3.1 Definitions:
all operators as to the correct procedures for performing tests
3.1.1 For definitions of terms used in this test method refer
safety. When making high voltage tests, particularly in com-
to Terminology D 1711.
pressed gas or in oil, it is possible for the energy released at
4. Summary of Test Method breakdown to be suffıcient to result in fire, explosion, or rupture
of the test chamber. Design test equipment, test chambers, and
4.1 A varnish is applied to twisted pairs of film-insulated
test specimens so as to minimize the possibility of such
magnet wire and aged at several elevated temperatures. Life
occurrences and to eliminate the possibility of personal injury.
test results are compared to those of unvarnished twisted pairs.
If the potential for fire exists, have fire suppression equipment
available.
This test method is under the jurisdiction of ASTM Committee D-9 on
7. Sampling
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
7.1 Sample the varnish in accordance with Test Methods
lating Compounds.
D 115.
Current edition approved Oct. 10, 1999. Published November 1999. Originally
published as D 3251 – 73. Last previous edition D 3251 – 95.
8. Test Specimen
Annual Book of ASTM Standards, Vol 10.01.
Available from American National Standards Association, 11 W. 42nd St., 13th
8.
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