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ASTM D3251-04

(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
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.
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 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.Note 1
This test method is equivalent to IEC 60172.

General Information

Status
Historical
Publication Date
29-Feb-2004
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.01 - Electrical Insulating Products
Current Stage
Ref Project

Relations

Replaces
ASTM D3251-03 - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
Effective Date
01-Mar-2004
Replaced By
ASTM D3251-04(2009) - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
Effective Date
01-Oct-2009
Referred By
ASTM D2307-21 - Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
Effective Date
01-Mar-2004
Referred By
ASTM D115-17 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
Effective Date
01-Mar-2004
Referred By
ASTM D3145-20 - Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
Effective Date
01-Mar-2004
Referred By
ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Mar-2004

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ASTM D3251-04 - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet WireASTM D3251-04 - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
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ASTM D3251-04 - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation:D3251–04
Standard Test Method for
Thermal Endurance Characteristics of Electrical Insulating
1
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 3.1.1 For definitions of terms used in this test method refer
to Terminology D1711.
1.1 Thistestmethodcoversthedeterminationofthethermal
endurance characteristics of electrical insulating varnishes and
4. Summary of Test Method
film-insulated magnet wire in combination.
4.1 A varnish is applied to twisted pairs of film-insulated
1.2 The values stated in SI units are to be regarded as the
magnet wire and exposed to elevated temperatures. Life test
standard.
results are compared to those of unvarnished twisted pairs.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 Different combinations of varnishes and film-insulated
priate safety and health practices and determine the applica-
magnet wire behave differently when exposed to elevated
bility of regulatory limitations prior to use.
temperatures. This includes different varnishes tested with the
NOTE 1—This test method is equivalent to IEC 60172.
same film-insulated magnet wire and a single varnish tested
with different film-insulated magnet wire.
2. Referenced Documents
5.2 This test method is used to determine the effect on the
2
2.1 ASTM Standards:
electrical properties of a varnish applied to film-insulated
D115 Test Methods for Testing Solvent Containing Var-
magnet wire when the combination is exposed to prescribed
nishes Used for Electrical Insulation
elevated temperatures.
D1711 Terminology Relating to Electrical Insulation
D2307 Test Method for Thermal Endurance of Film- 6. Hazards
Insulated Round Magnet Wire
6.1 It is unsafe to use varnish at temperatures above the
2.2 IEC Standard:
flash point without adequate ventilation, especially if the
IEC 60172 Test Procedure for the determination of the
possibility exists that flames or sparks are present. Store
3
temperature index of enameled winding wires
varnish in sealed containers. This also applies to specified
reagents and solvents. (Warning—Lethal voltages are a po-
3. Terminology
tential hazard during the performance of this test. It is essential
3.1 Definitions:
thatthetestapparatus,andallassociatedequipmentelectrically
connected to it, be properly designed and installed for safe
operation. Solidly ground all electrically conductive parts
1
This test method is under the jurisdiction of ASTM Committee D09 on
which it is possible for a person to contact during the test.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Provide means for use at the completion of any test to ground
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
lating Compounds. any parts which were at high voltage during the test or have the
Current edition approved March 1, 2004. Published March 2004. Originally
potential for acquiring an induced charge during the test or
approved in 1973. Last previous edition approved in 2003 as D3251–03. DOI:
retaining a charge even after disconnection of the voltage
10.1520/D3251-04.
2
source. Thoroughly instruct all operators as to the correct
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
procedures for performing tests safety. When making high
Standards volume information, refer to the standard’s Document Summary page on
voltage tests, particularly in compressed gas or in oil, it is
the ASTM website.
3 possiblefortheenergyreleasedatbreakdowntobesufficientto
Available from American National Standards Association, 25 W. 43rd St., 4th
Floor, New York, NY 10036. result in fire, explosion, or rupture of the test chamber. Design
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D3251–04
test equipment, test chambers, and test specimens so as to 9.2.2 Solventless Varnishes:
minimize the possibility of such occurrences and to eliminate 9.2.2.1 Test solventless varnishes in the “as made” condi-
the possibility of personal injury. If the potential for fire exists, tion.
have fire suppression equipment available.) 9.2.2.2 The number of dips used for a solventless varnish
...

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