IEC TS 62896:2015

IEC TS 62896 ®
Edition 1.0 2015-11
TECHNICAL
SPECIFICATION
Hybrid insulators for a.c. and d.c. high-voltage applications – Definitions, test
methods and acceptance criteria
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IEC TS 62896 ®
Edition 1.0 2015-11
TECHNICAL
SPECIFICATION
Hybrid insulators for a.c. and d.c. high-voltage applications – Definitions, test

methods and acceptance criteria

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10 ISBN 978-2-8322-3017-6

– 2 – IEC TS 62896:2015  IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Definitions . 7
4 Identification . 9
5 Environmental conditions . 9
6 Tolerances . 9
7 Classification of tests . 10
7.1 Design tests . 10
7.2 Type tests . 10
7.3 Sample tests . 11
7.4 Routine tests . 11
8 Design tests . 12
8.1 General . 12
8.2 Tests on interfaces and connections of end fittings . 13
8.2.1 General . 13
8.2.2 Pre-stressing . 13
8.2.3 Verification tests . 14
8.3 Tests on Shed and Housing Material . 14
8.3.1 Hardness test . 14
8.3.2 Accelerated weathering test . 14
8.3.3 Tracking and erosion test . 15
8.3.4 Flammability test . 15
9 Type tests . 15
9.1 General . 15
9.2 Electrical tests . 15
9.3 Mechanical tests . 15
10 Sample tests . 15
11 Routine tests . 15
Annex A (informative) Comparison between hybrid insulators and glass fibre cored
polymeric housing and porcelain insulators. 16
A.1 History . 16
A.2 Comparison between porcelain and pultruded GFRP rod . 16
A.3 Advantages of hybrid insulators over conventional porcelain insulators . 16
A.4 Advantages of hybrid insulators over glass fibre cored insulators . 17
A.5 Problems shared with polymeric insulators . 17
A.6 Transport, storage and installation . 17
Bibliography . 18

Figure 1 – Thermal cycle test . 14

Table 1 – Required tests . 12
Table 2 – Design tests. 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HYBRID INSULATORS FOR A.C. AND D.C. HIGH-VOLTAGE
APPLICATIONS – DEFINITIONS, TEST METHODS
AND ACCEPTANCE CRITERIA
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 TS 62896, which is a technical specification, has been prepared by IEC technical
committee 36: Insulators.
– 4 – IEC TS 62896:2015  IEC 2015
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
36/362/DTS 36/368/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
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• transformed into an International standard,
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• amended.
INTRODUCTION
Hybrid insulators consist of an insulating core, bearing the mechanical load protected by a
polymeric housing, the load being transmitted to the core by end fittings. Despite these
common features, the materials used and the construction details employed by different
manufacturers may be quite different. The core is made of ceramic or glass material.
Hybrid insulators are applied as overhead line, post or hollow core equipment insulators. In
order to perform the design tests, IEC 62217 shall be applied for the polymeric housing and the
interfaces between core and the housing. For the core, the test standards for the respective
ceramic product (IEC 60168, IEC 60383 and IEC 62155) shall be applied.
Some tests have been grouped together as "design tests", to be performed only once on
ins
...