IEC TS 62073:2016
(Main)Guidance on the measurement of hydrophobicity of insulator surfaces
Guidance on the measurement of hydrophobicity of insulator surfaces
IEC TS 62073:2016(E) specifies the measurement of the hydrophobicity of the shed and housing material of composite insulators for overhead lines, substations and equipment or ceramic insulators covered or not covered by a coating. The obtained value represents the hydrophobicity at the time of the measurement. The object of this technical specification is to describe three methods that can be used to determine the hydrophobicity of insulators. The determination of the ability of water to wet the surface of insulators may be useful to evaluate the condition of the surface of insulators in service, or as part of the insulator testing in the laboratory. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Changed wettability to hydrophobicity throughout the document
b) Redefined the criteria for the determination of hydrophobicity class in paragraph 3.4.
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IEC TS 62073 ®
Edition 2.0 2016-02
TECHNICAL
SPECIFICATION
Guidance on the measurement of hydrophobicity of insulator surfaces
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IEC TS 62073 ®
Edition 2.0 2016-02
TECHNICAL
SPECIFICATION
Guidance on the measurement of hydrophobicity of insulator surfaces
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10 ISBN 978-2-8322-3169-2
– 2 – IEC TS 62073:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Terms and definitions . 7
3 Methods for measurement of hydrophobic properties . 9
3.1 General . 9
3.2 Method A – Contact angle method . 9
3.2.1 General . 9
3.2.2 Equipment . 9
3.2.3 Measurement procedure . 9
3.2.4 Static contact angle measurements . 10
3.2.5 Dynamic contact angle measurements . 10
3.2.6 Evaluation . 10
3.3 Method B – Surface tension method . 11
3.3.1 General . 11
3.3.2 Safety precautions . 11
3.3.3 Equipment and reagents . 11
3.3.4 Measurement procedure . 12
3.3.5 Evaluation . 12
3.4 Method C – The spray method . 12
3.4.1 General . 12
3.4.2 Equipment . 12
3.4.3 Measurement procedure . 13
3.4.4 Evaluation . 13
3.5 Documentation . 14
Annex A (normative) Guidelines regarding the applicability and comments on the
limitations of the different methods described in this technical specification . 15
A.1 General . 15
A.2 Typical results obtained with the three methods . 15
Annex B (normative) Method A – Contact angle method . 17
Annex C (normative) Method B – Surface tension method . 18
Annex D (normative) Method C – Spray method . 20
Figure 1 – Definition of the static contact angle . 8
Figure 2 – Definition of the advancing angle (θ ) and the receding angle (θ ) inside a
a r
liquid drop resting on an inclined solid surface . 8
Figure 3 – Measurements of the advancing angle (θ ) and the receding angle (θ ) by
a r
adding or withdrawing water from a droplet. 10
Figure B.1 – Measurement of the advancing angle (θ ) and the receding angle (θ ) by
a r
using the captive bubble technique. 17
Figure D.1 – Examples of surfaces with hydrophobicity class (HC) from 1 to 6 . 20
Table 1 – Criteria for the determination of hydrophobicity class (HC) . 14
Table C.1 – Concentrations of ethylene-glycol-monoethyl-ether (cellosolve),
formamide mixtures used in measuring surface tension of insulator surfaces in the
range 30 mN/m to 56 mN/m (T = 20 °C) . 18
Table C.2 – Concentrations of distilled water and formamide mixture used in
measuring surface tension of insulator surfaces in the range 58 mN/m to 73 mN/m
(T = 20 °C) . 19
Table C.3 – Concentrations of distilled water and sodium chloride in mixtures used in
measuring surface tension of insulator surfaces in the range 73 mN/m to 82 mN/m
(T = 20 °C) . 19
– 4 – IEC TS 62073:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE ON THE MEASUREMENT OF HYDROPHOBICITY
OF INSULATOR SURFACES
FOREWORD
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Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62073, which is a technical specification, has been prepared by IEC technical committee
36: Insulators.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Changed wettability to hydrophobicity throughout the document
b) Redefined the criteria for the determination of hydrophobicity class in paragraph 3.4;
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
36/363/DTS 36/367/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
– 6 – IEC TS 62073:2016 © IEC 2016
INTRODUCTION
The wetting properties of a surface
...
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