ASTM D2307-01
(Test Method)Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
SCOPE
1.1 This test method covers determination of the thermal endurance of film-insulated round magnet wire in air at atmospheric pressure. It is not applicable to magnet wire with fibrous insulation, such as cotton or glass.
Note 1—Other solid conductors such as coated resistance wire may be evaluated by this test method.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI units in parentheses are provided for information only.
1.3 This test method covers the evaluation of thermal endurance by observing changes in response to ac proof voltage tests. The evaluation of thermal endurance by observing changes in other properties of magnet wire insulation requires the use of different test methods.
1.4 Exposure of some types of film insulated wire to heat in gaseous or liquid environments in the absence of air may give thermal endurance values different from those obtained in air. This fact should be considered when interpreting the results obtained by heating in air with respect to applications where the wire will not be exposed to air in service.
1.5 Electric stress applied for extended periods at a level exceeding or even approaching the discharge inception voltage may change significantly the thermal endurance of film insulated wires, varnished or unvarnished. Under such electric stress conditions, comparisons between materials may also differ from those developed using this method.
1.6 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:D2307–01
Standard Test Method for
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Thermal Endurance of Film-Insulated Round Magnet Wire
This standard is issued under the fixed designation D 2307; 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 D 115 Test Methods for Varnishes Used for Electrical Insu-
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lation
1.1 This test method covers determination of the thermal
D 5423 Specification for Forced-Convection Laboratory
endurance of film-insulated round magnet wire in air at
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Ovens for Evaluation of Electrical Insulation
atmospheric pressure. It is not applicable to magnet wire with
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2.2 IEEE Standards:
fibrous insulation, such as cotton or glass.
IEEE 101 Statistical Analysis of Thermal Life Test Data
NOTE 1—Other solid conductors such as coated resistance wire may be
evaluated by this test method.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions:
as the standard. The SI units in parentheses are provided for
3.1.1 temperature index, n—a number which permits com-
information only.
parison of the temperature/time characteristics of an electrical
1.3 This test method covers the evaluation of thermal
insulatingmaterial,orasimplecombinationofmaterials,based
endurance by observing changes in response to ac proof
on the temperature in degrees celsius which is obtained by
voltage tests. The evaluation of thermal endurance by observ-
extrapolating theArrhenius plot of life versus temperature to a
ing changes in other properties of magnet wire insulation
specified time, usually 20 000 h.
requires the use of different test methods.
3.1.2 thermal endurance, n—an expression for the stability
1.4 Exposure of some types of film insulated wire to heat in
of an electrical insulating material, or a simple combination of
gaseous or liquid environments in the absence of air may give
materials, when maintained at elevated temperatures for ex-
thermal endurance values different from those obtained in air.
tended periods of time.
This fact should be considered when interpreting the results
3.2 Definitions of Terms Specific to This Standard:
obtained by heating in air with respect to applications where
3.2.1 specimen failure time, n—the hours at the exposure
the wire will not be exposed to air in service.
temperature that have resulted in a specimen failing the proof
1.5 Electric stress applied for extended periods at a level
test (see 9.1).
exceeding or even approaching the discharge inception voltage
3.2.2 time to failure, n—the hours calculated for a set of
may change significantly the thermal endurance of film insu-
specimens, calculated from the individual specimen failure
lated wires, varnished or unvarnished. Under such electric
times at an exposure temperature (see 9.2).
stress conditions, comparisons between materials may also
4. Summary of Test Method
differ from those developed using this method.
1.6 This standard does not purport to address all of the 4.1 This test method specifies the preparation of specimens,
safety concerns, if any, associated with its use. It is the
the aging of these specimens at elevated temperatures, and the
responsibility of the user of this standard to consult and periodic testing of the specimens by applying a preselected
establish appropriate safety and health practices and deter-
proof voltage.
mine the applicability of regulatory limitations prior to use. 4.2 The cyclic exposure to temperature is repeated until a
sufficient number of specimens have failed to meet the proof
2. Referenced Documents
test, and the time to failure is calculated in accordance with
2.1 ASTM Standards:
Section 9.The test is carried out at three or more temperatures.
A regression line is calculated in accordance with Section 10,
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This test method is under the jurisdiction of ASTM Committee D09 on
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Electrical and Electronic Insulating Materials and is the direct responsibility of Annual Book of ASTM Standards, Vol 10.01.
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Subcommittee D09.10 on Magnet Wire Insulation. Annual Book of ASTM Standards, Vol 10.02.
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Current edition approved Sept. 10, 2001. Published November 2001. Originally Available from the Institute of Electrical and Electronics Engineers, Inc., 345
published as D 2307 – 64T. Last previous edition D 2307 – 95. E. 47th St., New York, NY 10017.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2307
and the time to failure values plotted on thermal endurance 5.5.8 Environmental factors such as moisture, chemical
graph paper (se
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