IEC TR 62039:2021

IEC TR 62039 ®
Edition 2.0 2021-08
TECHNICAL
REPORT
colour
inside
Selection guidelines for polymeric materials for outdoor use under HV stress
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IEC TR 62039 ®
Edition 2.0 2021-08
TECHNICAL
REPORT
colour
inside
Selection guidelines for polymeric materials for outdoor use under HV stress

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.035.20; 29.080.10 ISBN 978-2-8322-1012-8

– 2 – IEC TR 62039:2021 © IEC:2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Important material properties . 9
4.1 General . 9
4.2 Resistance to tracking and erosion . 9
4.3 Arc resistance . 9
4.4 Water diffusion test (resistance of material to chemical and physical
degradation by water) . 10
4.4.1 General . 10
4.4.2 Test specimens . 10
4.4.3 Test procedure . 10
4.4.4 Minimum requirements . 12
4.5 Tear strength . 13
4.6 Volume resistivity . 13
4.7 Breakdown field strength . 13
4.8 Stress corrosion test (resistance to chemical attack) . 13
4.8.1 General . 13
4.8.2 Test specimens . 14
4.8.3 Procedure . 14
4.8.4 Acceptance criteria . 14
4.9 Resistance to weathering and UV procedure . 14
4.10 Resistance to flammability procedure . 15
4.11 Glass transition temperature . 15
4.12 Hydrophobicity . 17
4.12.1 General . 17
4.12.2 Transfer of hydrophobicity . 17
4.12.3 Retention and recovery of hydrophobicity . 21
5 Important properties and minimum requirements of polymeric insulation materials
for outdoor use under HV stress . 22
Annex A (informative) Additional measuring methods . 25
A.1 General . 25
A.2 Resistance to corona and ozone . 25
A.3 Resistance to acid attack generated by partial discharge under wet,
contaminated, and energization condition . 25
Annex B (informative) Water immersion test . 26
B.1 General . 26
B.2 Test procedure . 26
Bibliography . 28

Figure 1 – Example of boiling container for water diffusion test . 11
Figure 2 – Electrodes for voltage test . 12
Figure 3 – Voltage test circuit . 12
Figure 4 – Example of permanent load application for stress corrosion test . 14

Figure 5 – Definition of glass transition temperature T . 16
g
Figure 6 – Specimen with adhesive foil . 18
Figure 7 – Specimen with pollution layer . 19
Figure 8 – Area for the drop application for measurement according to IEC TS 62073
(example for Method A). 21
Figure B.1 – Example of water uptake of two different kinds of materials (MFRP and
UFRP) . 27

Table 1 – Important properties and minimum requirements of polymeric insulation
materials for outdoor use under HV stress . 22
Table B.1 – Example of dielectric properties in dry conditions and after water
immersion for 100 days . 27

– 4 – IEC TR 62039:2021 © IEC:2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SELECTION GUIDELINES FOR POLYMERIC MATERIALS
FOR OUTDOOR USE UNDER HV STRESS

FOREWORD
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IEC TR 62039 has been prepared by IEC technical committee 112: Evaluation and qualification
of electrical insulating materials and systems. It is a Technical Report.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of hydrophobicity definitions and hydrophobicity transfer test;
b) addition of stress corrosion test.

The text of this Technical Report is based on the following documents:
Draft Report on voting
112/526/DTR 112/535/RVDTR
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 Report 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
described in greater detail at www.iec.ch/standardsdev/publications.
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,
• withdr
...