IEC TS 63263:2025

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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rights.
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)
...