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BSI PD IEC/TS 62073:2016

BSI PD IEC/TS 62073:2016

$142.49

Guidance on the measurement of hydrophobicity of insulator surfaces

Published By Publication Date Number of Pages
BSI 2016 24
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The methods described in this technical specification can be used for 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.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Terms and definitions
10 Figures
Figure 1 – Definition of the static contact angle
Figure 2 – Definition of the advancing angle ((a) and the receding angle ((r) inside a liquid drop resting on an inclined solid surface
11 3 Methods for measurement of hydrophobic properties
3.1 General
3.2 Method A – Contact angle method
3.2.1 General
3.2.2 Equipment
3.2.3 Measurement procedure
12 3.2.4 Static contact angle measurements
3.2.5 Dynamic contact angle measurements
3.2.6 Evaluation
Figure 3 – Measurements of the advancing angle ((a) and the receding angle ((r) by adding or withdrawing water from a droplet
13 3.3 Method B – Surface tension method
3.3.1 General
3.3.2 Safety precautions
3.3.3 Equipment and reagents
14 3.3.4 Measurement procedure
3.3.5 Evaluation
3.4 Method C – The spray method
3.4.1 General
3.4.2 Equipment
15 3.4.3 Measurement procedure
3.4.4 Evaluation
16 3.5 Documentation
Tables
Table 1 – Criteria for the determination of hydrophobicity class (HC)
17 Annex A (normative) Guidelines regarding the applicability and comments on the limitations of the different methods described in this technical specification
A.1 General
A.2 Typical results obtained with the three methods
19 Annex B (normative) Method A – Contact angle method
Figure B.1 – Measurement of the advancing angle ((a) and the receding angle ((r) by using the captive bubble technique
20 Annex C (normative) Method B – Surface tension method
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)
21 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)
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)
22 Annex D (normative) Method C – Spray method
Figure D.1 – Examples of surfaces with hydrophobicity class (HC) from 1 to 6

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BSI PD IEC/TS 62073:2016
$142.49