EN 61952:2008

Insulators for overhead lines - Composite line post insulators for A.C. systems with a nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria

IEC 61952:2008 applies to composite line post insulators consisting of a load-bearing, cylindrical, insulating solid core made up of fibres - usually glass - in a resin-based matrix, a housing (outside the insulating core) made of elastomer material (e.g. silicone or ethylene-propylene) and end fittings permanently attached to the insulating core. The object of this standard is to - define the terms used, - prescribe test methods, - prescribe acceptance or failure criteria. This standard does not include requirements dealing with the choice of insulators for specific operating conditions. This edition includes the following significant technical changes with respect to the previous edition: - removal of tests procedures now given in IEC 62217; - inclusion of clauses on tolerances, environmental conditions, transport, storage and installation; - changes in the parameters determining the need to repeat design and type tests; and - modification of the specification of load application in bending tests to simplify testing.

Isolatoren für Freileitungen - Verbund-Freileitungsstützer für Wechselstromsysteme mit einer Nennspannung über 1 000 V - Begriffe, Prüfverfahren und Annahmekriterien

Isolateurs pour lignes aériennes - Isolateurs composites rigides à socle pour systèmes à courant alternatif de tension nominale supérieure à 1 000 V - Définitions, méthodes d'essai et critères d'acceptation

La CEI 61952:2008 est applicable aux isolateurs composites rigides à socle constitués d'un noyau isolant cylindrique supportant la charge, composé de fibres - habituellement en verre - dans une matrice à base de résine, d'un revêtement (extérieur au noyau isolant) en matériau élastomère (par exemple silicone ou éthylène-propylène) et d'armatures d'extrémité reliées de façon permanente au noyau isolant. La présente norme a pour objet: - de définir les termes employés, - de fixer les méthodes d'essai, - de fixer les critères d'acceptation ou de rejet d'une fourniture. Cette norme n'inclut pas d'exigences relatives au choix des isolateurs pour des conditions de service spécifiques. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - suppression des procédures d'essai qui sont maintenant données dans la CEI 62217; - ajout d'articles concernant les tolérances, les conditions environnementales, le transport, le stockage et l'installation; - modification des paramètres déterminant la nécessité de répéter les essais de conception et de type et modification des exigences d'application des charges dans les essais de flexion pour faciliter les essais.

Izolatorji za nadzemne vode - Sestavljeni togi izolatorji s podstavkom za izmenične sisteme z nazivno napetostjo nad 1 000 V - Definicije, preskuševalne metode in prevzemna merila (IEC 61952:2008)

General Information

• Status: Published
• Publication Date: 14-Oct-2008
• Withdrawal Date: 31-Aug-2011
• ICS: 29.080.10 - Insulators
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/SR 36 - Insulators for substations
• Drafting Committee: IEC/TC 36 - IEC_TC_36
• Parallel Committee: IEC/SC 36B - IEC_SC_36B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 15-Oct-2008
• Completion Date: 15-Oct-2008
• Ref Project: SIST EN 61952:2008 - Insulators for overhead lines - Composite line post insulators for A.C. systems with a nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria (IEC 61952:2008)

Relations

• Replaces: EN 61952:2003 - Insulators for overhead lines - Composite line post insulators for alternative current with a nominal voltage > 1 000 V
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61952:2008
01-december-2008
1DGRPHãþD
SIST EN 61952:2004

,]RODWRUML]DQDG]HPQHYRGH6HVWDYOMHQLWRJLL]RODWRUMLVSRGVWDYNRP]DL]PHQLþQH

VLVWHPH]QD]LYQRQDSHWRVWMRQDG9'HILQLFLMHSUHVNXãHYDOQHPHWRGHLQ
SUHY]HPQDPHULOD,(&

Insulators for overhead lines - Composite line post insulators for A.C. systems with a

nominal voltage greater than 1 000 V - Definitions, test methods and acceptance criteria

(IEC 61952:2008)

Isolatoren für Freileitungen - Verbund-Freileitungsstützer für Wechselstromsysteme mit

einer Nennspannung über 1 000 V - Begriffe, Prüfverfahren und Annahmekriterien (IEC

61952:2008)

Isolateurs pour lignes aériennes - Isolateurs composites rigides à socle pour systèmes à

courant alternatif de tension nominale supérieure à 1 000 V - Définitions, méthodes

d'essai et critères d'acceptation (CEI 61952:2008)
Ta slovenski standard je istoveten z: EN 61952:2008
ICS:
29.080.10 Izolatorji Insulators
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 61952:2008 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61952:2008
---------------------- Page: 2 ----------------------
SIST EN 61952:2008
EUROPEAN STANDARD
EN 61952
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 29.080.10; 29.240.20 Supersedes EN 61952:2003
English version
Insulators for overhead lines -
Composite line post insulators for A.C. systems
with a nominal voltage greater than 1 000 V -
Definitions, test methods and acceptance criteria
(IEC 61952:2008)
Isolateurs pour lignes aériennes - Isolatoren für Freileitungen -
Isolateurs composites rigides à socle Verbund-Freileitungsstützer
pour systèmes à courant alternatif de für Wechselstromsysteme
tension nominale supérieure à 1 000 V - mit einer Nennspannung über 1 000 V -
Définitions, méthodes d'essai Begriffe, Prüfverfahren
et critères d'acceptation und Annahmekriterien
(CEI 61952:2008) (IEC 61952:2008)

This European Standard was approved by CENELEC on 2008-09-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61952:2008 E
---------------------- Page: 3 ----------------------
SIST EN 61952:2008
EN 61952:2008 - 2 -
Foreword

The text of document 36B/273/FDIS, future edition 2 of IEC 61952, prepared by SC 36B, Insulators for

overhead lines, of IEC TC 36, Insulators, was submitted to the IEC-CENELEC parallel vote and was

approved by CENELEC as EN 61952 on 2008-09-01.
This standard supersedes EN 61952:2003.

EN 61952:2008 includes the following significant technical changes with respect to EN 61952:2003:

– removal of tests procedures now given in EN 62217,

– inclusion of clauses on tolerances, environmental conditions, transport, storage and installation,

– changes in the parameters determining the need to repeat design and type tests,

– clarification of the mounting arrangements for electrical type tests,

– modification of the specification of load application in bending tests to simplify testing,

– additional requirements for the visual examination,
– removal of the annex explaining the concept of classes for design tests.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 61952:2008 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60507 NOTE Harmonized as EN 60507:1993 (not modified).
IEC 61462 NOTE Harmonized as EN 61462:2007 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 61952:2008
- 3 - EN 61952:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60383-1 - Insulators for overhead lines with a nominal EN 60383-1 1996
voltage above 1 kV - + A11 1999
Part 1: Ceramic or glass insulator units for
a.c. systems - Definitions, test methods and
acceptance criteria
1) 2)
IEC 60383-2 - Insulators for overhead lines with a nominal EN 60383-2 1995
voltage above 1 kV -
Part 2: Insulator strings and insulator sets for
a.c. systems - Definitions, test methods and
acceptance criteria
1) 2)
IEC 62217 - Polymeric insulators for indoor and outdoor EN 62217 2006
use with a nominal voltage > 1 000 V - + corr. December 2006
General definitions, test methods and
acceptance criteria
ISO 3452 - Non-destructive testing - Penetrant - -
inspection - General principles
Undated reference.
Valid edition at date of issue.
---------------------- Page: 5 ----------------------
SIST EN 61952:2008
---------------------- Page: 6 ----------------------
SIST EN 61952:2008
IEC 61952
Edition 2.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines – Composite line post insulators for A.C. systems
with a nominal voltage greater than 1 000 V – Definitions, test methods and
acceptance criteria
Isolateurs pour lignes aériennes – Isolateurs composites rigides à socle pour
systèmes à courant alternatif de tension nominale supérieure à 1 000 V –
Définitions, méthodes d’essai et critères d’acceptation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.080.10; 29.240.20 ISBN 2-8318-9784-X
---------------------- Page: 7 ----------------------
SIST EN 61952:2008
– 2 – 61952 © IEC:2008
CONTENTS

FOREWORD...........................................................................................................................4

INTRODUCTION.....................................................................................................................6

1 Scope...............................................................................................................................8

2 Normative references .......................................................................................................8

3 Terms and definitions .......................................................................................................8

4 Abbreviations .................................................................................................................10

5 Identification...................................................................................................................10

6 Environmental conditions................................................................................................11

7 Transport, storage and installation..................................................................................11

8 Tolerances .....................................................................................................................11

9 Classification of tests .....................................................................................................11

9.1 Design tests ..........................................................................................................11

9.2 Type tests .............................................................................................................12

9.3 Sample tests .........................................................................................................12

9.4 Routine tests .........................................................................................................12

10 Design tests ...................................................................................................................13

10.1 General .................................................................................................................13

10.2 Test specimens for IEC 62217...............................................................................14

10.2.1 Tests on interfaces and connections of end fittings....................................14

10.2.2 Tracking and erosion test ..........................................................................14

10.2.3 Tests on core material ...............................................................................15

10.3 Product specific pre-stressing for IEC 62217 tests on interfaces and

connections of end fittings.....................................................................................15

10.3.1 Thermal-mechanical pre-stressing .............................................................15

10.4 Assembled core load tests.....................................................................................15

10.4.1 Test for the verification of the maximum design cantilever load

(MDCL)......................................................................................................15

10.4.2 Tensile load test ........................................................................................16

11 Type tests ......................................................................................................................16

11.1 Electrical tests.......................................................................................................17

11.1.1 Vertical mounting arrangement ..................................................................17

11.1.2 Horizontal mounting arrangement ..............................................................17

11.2 Mechanical tests ...................................................................................................18

11.2.1 Cantilever failing load test .........................................................................18

12 Sample tests ..................................................................................................................19

12.1 General rules ........................................................................................................19

12.2 Verification of dimensions (E1 + E2)......................................................................19

12.3 Galvanizing test (E1 + E2).....................................................................................19

12.4 Verification of the SCL (E1) ...................................................................................19

12.4.1 Test procedure ..........................................................................................19

12.4.2 Acceptance criteria....................................................................................20

12.5 Re-testing procedure.............................................................................................20

13 Routine tests ..................................................................................................................20

13.1 Tensile load test....................................................................................................20

13.2 Visual examination ................................................................................................20

---------------------- Page: 8 ----------------------
SIST EN 61952:2008
61952 © IEC:2008 – 3 –

Annex A (informative) Notes on the mechanical loads and tests ..........................................22

Annex B (informative) Determination of the equivalent bending moment caused by

combined loads.....................................................................................................................24

Bibliography..........................................................................................................................27

Figure 1 – Thermal-mechanical pre-stressing test – Typical cycles .......................................21

Figure B.1 – Combined loads applied to unbraced insulators ................................................25

Figure B.2 – Combined loads applied to braced insulators ....................................................26

Table 1 – Tests to be carried out after design changes .........................................................13

Table 2 – Design tests ..........................................................................................................14

Table 3 – Mounting arrangements for electrical tests ............................................................17

Table 4 – Sample sizes according to lot size.........................................................................19

---------------------- Page: 9 ----------------------
SIST EN 61952:2008
– 4 – 61952 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES –
COMPOSITE LINE POST INSULATORS FOR A.C.
SYSTEMS WITH A NOMINAL VOLTAGE
GREATER THAN 1 000 V –
DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61952 has been prepared by subcommittee 36B: Insulators for

overhead lines, of IEC technical committee 36: Insulators.

This second edition cancels and replaces the first edition published in 2002. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– removal of tests procedures now given in IEC 62217,

– inclusion of clauses on tolerances, environmental conditions, transport, storage and

installation,

– changes in the parameters determining the need to repeat design and type tests,

– clarification of the mounting arrangements for electrical type tests,

– modification of the specification of load application in bending tests to simplify testing,

---------------------- Page: 10 ----------------------
SIST EN 61952:2008
61952 © IEC:2008 – 5 –
– additional requirements for the visual examination,
– removal of the annex explaining the concept of classes for design tests.
The text of this standard is based on the following documents:
FDIS Report on voting
36B/273/FDIS 36B/275/RVD

Full information on the voting for the approval of this standard 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 maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
---------------------- Page: 11 ----------------------
SIST EN 61952:2008
– 6 – 61952 © IEC:2008
INTRODUCTION

Composite line post insulators consist of a cylindrical solid insulating core, bearing the

mechanical load, protected by a polymeric housing, the loads being transmitted to the core by

metal fittings. Despite these common features, the materials used and the construction details

employed by different manufacturers may be different.

Some tests have been grouped together as "design tests", to be performed only once on

insulators which satisfy the same design conditions. All the design tests defined in IEC 62217

are applied for composite line post insulators; additional specific mechanical tests are given in

this standard. As far as practical, the influence of time on the electrical and mechanical

properties of the components (core material, housing, interfaces, etc.) and of the complete

composite insulators has been considered in specifying the design tests to ensure a

satisfactory life-time under normally known stress conditions of transmission lines.

Composite insulators are used in both a.c. and d.c. applications. In spite of this fact a specific

tracking and erosion test procedure for d.c. applications as a design test has not yet been

defined and accepted. The 1 000 h a.c. tracking and erosion test of IEC 62217 is used to

establish a minimum requirement for the tracking resistance of the housing material.

The approach for mechanical testing under bending loads used in this standard is based on

the work of CIGRE [1] . This approach uses the concept of a damage limit which is the

maximum stress which can be developed in the insulator before damage begins to occur.

Annex A gives some notes on the mechanical loads and tests used in this standard.

Line post insulators are often used in braced structures whose geometry varies from line to

line. A combined loading test to reproduce the complex loading cases in such structures is

outside the scope of this standard and it would be very difficult to specify a general test which

covers the majority of geometry and loading cases. In order to give some guidance, Annex B

explains how to calculate the moment in the insulators resulting from combined loads. This

moment can then be equated to an equivalent bending load or stress for design purposes.

Further information is available from CIGRE [2].

Compression load tests are not specified in this standard. The mechanical loads expected

from service stress acting on line post insulators are mostly combined loads. These loads will

cause some deflection on the insulator. Compression loads applied on pre-deflected

insulators will lead to results largely dependent on the pre-deflection. Therefore a pure

compression test has little meaning since the deflection prior to the cantilever load test cannot

be specified.

Pollution tests, as specified in IEC 60507 [3], are not included in this standard, their

applicability to composite line post insulators not having been proven. Such pollution tests

performed on insulators made of non-ceramic materials do not correlate with experience

obtained from service. Specific pollution tests for non-ceramic insulators are under

consideration.
———————
Figures in square brackets refer to the bibliography.
---------------------- Page: 12 ----------------------
SIST EN 61952:2008
61952 © IEC:2008 – 7 –

It has not been considered useful to specify a power arc test as a mandatory test. The test

parameters are manifold and can have very different values depending on the configurations

of the network and the supports and on the design of arc-protection devices. The heating

effect of power arcs should be considered in the design of metal fittings. Critical damage to

the metal fittings, resulting from the magnitude and duration of the short-circuit current can be

avoided by properly designed arc-protection devices.

This standard, however, does not exclude the possibility of a power arc test by agreement

between the user and manufacturer. IEC 61467 [4] gives details of a.c. power arc testing of

insulator sets.

Radio interference and corona tests are not specified in this standard since the RIV and

corona performance are not characteristics of the insulator alone.

Composite hollow core line post insulators are currently not dealt with in this standard.

IEC 61462 [5] gives details of tests on hollow core composite insulators, many of which can

be applied to such line post insulators.

Torsion loads are not dealt with in this standard since they are usually negligible in the

configuration in which line post insulators are generally used. Specific applications where high

torsion loads can occur are outside the scope of this standard.

The application of this standard to hybrid line post insulators (e.g. those having a core made

of a material other than resin impregnated fibres) has not been fully studied. For example, in

general the load-time mechanical tests and tests for core material are not applicable to

porcelain cores. It is therefore recommended that this standard be considered as a provisional

standard for hybrid line post insulators, using an agreed selection of tests from this standard

and from IEC 60383-1.

Wherever possible, IEC Guide 111 [6] has been followed for the drafting of this standard.

---------------------- Page: 13 ----------------------
SIST EN 61952:2008
– 8 – 61952 © IEC:2008
INSULATORS FOR OVERHEAD LINES –
COMPOSITE LINE POST INSULATORS FOR A.C.
SYSTEMS WITH A NOMINAL VOLTAGE
GREATER THAN 1 000 V –
DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA
1 Scope

This International Standard applies to composite line post insulators consisting of a load-

bearing cylindrical insulating solid core consisting of fibres – usually glass – in a resin-based

matrix, a housing (outside the insulating core) made of polymeric material and end fittings

permanently attached to the insulating core.

Composite line post insulators covered by this standard are subjected to cantilever, tensile

and compressive loads, when supporting the line conductors. They are intended for use on

a.c. overhead lines with a rated voltage greater than 1 000 V and a frequency not greater than

100 Hz.
The object of this standard is
– to define the terms used,
– to prescribe test methods,
– to prescribe acceptance or failure criteria.

This standard does not include requirements dealing with the choice of insulators for specific

operating conditions.
2 Normative references

The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.

IEC 60383-1, Insulators for overhead lines with a nominal voltage above 1 000 V – Part 1:

Ceramic or glass insulator units for a.c. systems – Definitions, test methods and acceptance

criteria

IEC 60383-2, Insulators for overhead lines with a nominal voltage above 1 000 V – Part 2:

Insulator strings and insulator sets for a.c. systems – Definitions, test methods and

acceptance criteria

IEC 62217, Polymeric insulators for indoor and outdoor use with a nominal voltage above

1 000 V – General definitions, test methods and acceptance criteria
ISO 3452, Non-destructive testing – Penetrant inspection – General principles
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

NOTE Certain terms from IEC 62217 are reproduced here for ease of reference. Additional definitions applicable

to insulators can be found in IEC 60050(471) [7]).
---------------------- Page: 14 ----------------------
SIST EN 61952:2008
61952 © IEC:2008 – 9 –
3.1
composite line post insulator

insulator consisting of a load-bearing cylindrical insulating solid core, a housing and end

fittings attached to the insulating core. It is intended to be subjected to cantilever, tensile and

compressive loads
3.2
core of a composite insulator

the internal insulating part of a composite insulator which is designed to ensure the

mechanical characteristics. The core usually consists of either fibres (e.g. glass) which are

positioned in a resin-based matrix or a homogeneous insulating material (e.g. porcelain or

resin)
[IEV 471-01-03, modified]
3.3
insulator trunk
central insulating part of an insulator from which the sheds project
NOTE Also known as shank on smaller insulators.
[IEV 471-01-11]
3.4
housing

external insulating part of a composite insulator providing the necessary creepage distance

and protecting core from the environment

NOTE An intermediate sheath made of insulating material may be part of the housing.

[IEV 471-01-09]
3.5
shed of an insulator

insulating part, projecting from the insulator trunk, intended to increase the creepage

distance. The shed can be with or without ribs
[IEV 471-01-15]
3.6
interfaces

surface between the different materials. Various interfaces occur in most composite

insulators, e.g.
– between housing and fixing devices,

– between various parts of the housing, e.g. between sheds, or between sheath and sheds,

– between core and housing
[IEC 62217, definition 3.10 ]
3.7
end fitting

integral component or formed part of an insulator intended to connect it to a supporting

structure, or to a conductor, or to an item of equipment, or to another insulator

NOTE Where the end fitting is metallic, the term “metal fitting” is normally used.

[IEV 471-01-06, modified]
---------------------- Page: 15 ----------------------
SIST EN 61952:2008
– 10 – 61952 © IEC:2008
3.8
connection zone

zone where the mechanical load is transmitted between the insulating body and the end fitting

[IEC 62217, definition 3.12]
3.9
coupling

part of the end fitting which transmits the load to the accessories external to the insulator

[IEC 62217, definition 3.13 modified]
3.10
delamination of the core
irreversible loss of bonding within fibre laminates perc
...