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IEC 60172
Edition 5.0 2020-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Test procedure for the determination of the temperature index of enamelled and
tape wrapped winding wires
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IEC 60172
Edition 5.0 2020-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Test procedure for the determination of the temperature index of enamelled and
tape wrapped winding wires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.10 ISBN 978-2-8322-9123-8
– 2 – IEC 60172:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Summary of procedure . 7
5 Test specimens . 7
5.1 Preparation . 7
5.1.1 Enamelled round wire with a nominal conductor diameter of 0,224 mm
up to and including 2,65 mm Enamelled non-tape wrapped round wire . 7
5.1.2 Tape wrapped round wire and enamelled or tape wrapped rectangular
wire . 11
5.2 Varnish impregnation . 13
5.3 Notes on number of test specimens . 14
5.4 Specimen holder . 14
5.4.1 For specimens according to 5.1.1 . 14
5.4.2 For specimens according to 5.1.2 . 15
6 Temperature exposure. 15
7 Test voltage and its application . 17
8 Calculations . 17
8.1 Specimen failure time . 17
8.2 Time to failure . 18
8.3 Linearity of data . 18
8.4 Calculating and plotting thermal endurance and temperature index . 18
9 Report . 19
Annex A (normative) Method for calculation of the regression line . 20
Annex B (normative) Correlation coefficient . 25
Bibliography . 26
Figure 1 – Device used to form enamelled round wire test specimen . 8
Figure 2 – Spacer . 9
Figure 3 – Twist forming jig . 9
Figure 4 – Test specimen set up in forming jig . 10
Figure 5 – Test specimen formed with loop cut . 10
Figure 6 – Jig for bending large magnet wire, dielectric test specimen . 12
Figure 7 – Forming jig and test specimen . 13
Figure 8 – Specimen holder . 14
Figure 9 – Specimen holder and electrical connection fixture .
Figure 9 – Thermal endurance graph – Temperature index . 19
Figure A.1 – Plot of regression line based on sample calculation (Table A.2) . 24
Table 1 – Force and number of twists for specimens . 8
Table 2 – Proof voltage for round enamelled wire . 10
Table 3 – Recommended exposure times in days per cycle. 16
Table 4 – Proof voltage for tape-wrapped round and for enamelled or tape-wrapped
rectangular wire . 17
Table A.1 – Commonly used test temperatures in degrees Celsius and the
corresponding kelvins with its reciprocal and reciprocal squared values . 22
Table A.2 – Sample calculation . 23
– 4 – IEC 60172:2020 RLV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE
INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard IEC 60172 has been prepared by IEC Technical Committee 55:
Winding wires.
This fifth edition cancels and replaces the fourth edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– revision of 3.1, definition of thermal index;
– revision of 3.3, time to failure;
– revisions to 5.1.1 for clarity and to reduce the range wire size range to which the test
applies;
– revisions to 5.1.2 for tape wrapped round and enamelled or tape wrapped rectangular wire
for clarity;
– revision to Clause 9 to add the correlation coefficient, r to the report.
The text of this International Standard is based on the following documents:
FDIS Report on voting
55/1876/FDIS 55/1893/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 60172:2020 RLV © IEC 2020
TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE
INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES
1 Scope
This International Standard specifies, in accordance with the provisions of IEC 60216-1, a
method for evaluating the temperature index of enamelled wire, varnished or unvarnished with
an impregnating agent, and of tape wrapped round and rectangular wire, in air at atmospheric
pressure by periodically
...