IEC TS 63263:2025
(Main)Winding wires - Test methods - Electrical endurance under high frequency voltage impulses
Winding wires - Test methods - Electrical endurance under high frequency voltage impulses
IEC TS 63263:2025 describes a test method for evaluating the lifetime of winding wires under electrical high frequency voltage impulses (with partial discharges) at elevated temperatures. This method is only applicable as a comparative examination under a given sample preparation and testing environment. The comparative nature of this document lies in the fact that the lifetime under partial discharges depends on a large number of influencing factors in the sample preparation and test conditions which could not all be thoroughly investigated so far.
This document applies to round and rectangular magnet wires.
General Information
Standards Content (Sample)
IEC TS 63263 ®
Edition 1.0 2025-08
TECHNICAL
SPECIFICATION
Winding wires - Test methods - Electrical endurance under high frequency
voltage impulses
ICS 29.060.10 ISBN 978-2-8327-0625-1
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CONTENTS
FOREWORD. 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General information on test methods . 6
5 High frequency impulse test equipment . 7
5.1 General . 7
5.2 Power supply . 7
5.3 Timing device . 8
5.4 Test oven and specimen placement . 8
5.5 Oscilloscope . 8
6 Test specimens . 9
6.1 Round wire . 9
6.1.1 Specimen preparation . 9
6.1.2 Initial screening test . 9
6.1.3 Specimen preconditioning . 9
6.2 Rectangular wire . 9
6.2.1 Specimen preparation . 9
6.2.2 Initial screening test . 9
6.2.3 Specimen preconditioning . 10
7 Test method . 10
7.1 Test impulse characteristics . 10
7.2 Test procedure . 10
7.3 Report . 11
Bibliography . 12
Figure 1 – bipolar voltage impulse (3.1) waveshape parameters . 7
Figure 2 – Example of specimen mounting and placement by clamp . 8
Table 1 – Proof voltage for enameled round wire . 9
Table 2 – Example of typical test impulse characteristics . 10
Table 3 – Example of typical test impulse voltage for enameled round wires . 10
Table 4 – Example of typical test impulse voltage for tape wrapped and cured round or
rectangular wire . 11
Table 5 – Example of typical test impulse voltage for enameled rectangular wire . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Winding wires - Test methods - Electrical endurance under high frequency
voltage impulses
FOREWORD
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IEC TS 63263 has been prepared by IEC technical committee 55: Winding wires. It is a
Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
55/2068/DTS 55/2073/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
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The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
This Technical Specification forms an element of a series of standards which deals with
insulated wires used for windings in electrical equipment. The series has three groups
describing:
a) Winding wires – Test methods (IEC 60851 (all parts) [1]);
b) Specifications for particular types of winding wires (IEC 60317 (all parts) [2]);
c) Packaging of winding wires (IEC 60264 (all parts) [3]).
1 Scope
This document describes a test method for evaluating the lifetime (3.9) of winding wires under
electrical high frequency voltage impulses (with partial discharges) at elevated temperatures.
This method is only applicable as a comparative examination under a given sample preparation
and testing environment. The comparative nature of this document lies in the fact that the
lifetime (3.9) under partial discharges depends on a large number of influencing factors in the
sample preparation and test conditions which could not all be thoroughly investigated so far.
This document applies to round and rectangular magnet wires.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60172:2020, Test procedure for the determination of the temperature index of enamelled
and tape wrapped winding wires
IEC 60851-5:2008, Winding wires - Test methods - Part 5: Electrical properties
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
bipolar voltage impulse
voltage impulse, the polarity of which alternates from positive to negative or vice versa
3.2
impulse repetition rate
inverse of the time between two successive impulses when the time intervals are the same,
whether unipolar or bipolar
3.3
impulse rise time
t
r
time for the voltage to rise from 10 % to 90 % of its final value (U )
p
[SOURCE: IEC 60034-18-41:2014 [4], 3.13, modified - In the definition, "(U )" has been added
p
and (see Figure 1) has been deleted.]
3.4
impulse duty cycle
ratio, for a given time interval, of the impulse width to the total time
3.5
peak impulse voltage
U
p
maximum numerical value of voltage reached during a unipolar voltage impulse
3.6
...
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