IEC 61109:2008

IEC 61109
Edition 2.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines – Composite suspension and tension 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 de suspension et
d’ancrage destinés aux systèmes à courant alternatif de tension nominale
supérieure à 1 000 V – Définitions, méthodes d'essai et critères d'acceptation

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IEC 61109
Edition 2.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines – Composite suspension and tension 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 de suspension et
d’ancrage destinés aux 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
U
CODE PRIX
ICS 29.080.10 ISBN 2-8318-9814-5

– 2 – 61109 ¤ IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope and object .7
2 Normative references.7
3 Terms, definitions and abbreviations .8
3.1 Terms and definitions .8
3.2 Abbreviations.10
4 Identification .10
5 Environmental conditions .10
6 Transport, storage and installation .10
7 Hybrid insulators.10
8 Tolerances .10
9 Classification of tests.11
9.1 Design tests .11
9.2 Type tests .11
9.3 Sample tests .11
9.4 Routine tests .11
10 Design tests .12
10.1 General .12
10.2 Test specimens for IEC 62217 .13
10.2.1 Tests on interfaces and connections of end fittings.13
10.2.2 Tracking and erosion test.13
10.2.3 Tests on core material .14
10.3 Product specific pre-stressing for IEC 62217.14
10.3.1 Sudden load release .14
10.3.2 Thermal-mechanical pre-stress .14
10.4 Assembled core load-time tests .14
10.4.1 Test specimens .14
10.4.2 Mechanical load test .15
11 Type tests.15
11.1 Electrical tests .15
11.2 Damage limit proof test and test of the tightness of the interface between end
fittings and insulator housing .16
11.2.1 Test specimens .16
11.2.2 Performance of the test.16
11.2.3 Evaluation of the test .17
12 Sample tests.17
12.1 General rules.17
12.2 Verification of dimensions (E1 + E2) .18
12.3 Verification of the end fittings (E2) .18
12.4 Verification of tightness of the interface between end fittings and insulator
housing (E2) and of the specified mechanical load, SML (E1).18
12.5 Galvanizing test (E2) .19
12.6 Re-testing procedure .19
13 Routine tests .19
13.1 Mechanical routine test.19

61109¤ IEC:2008 – 3 –
13.2 Visual examination .19
Annex A (informative) Principles of the damage limit, load coordination and testing for
composite suspension and tension insulators .21
Annex B (informative) Example of two possible devices for sudden release of load .25
Annex C (informative) Guidance on non-standard mechanical stresses and dynamic
mechanical loading of composite tension/suspension insulators.27
Bibliography .29
Figure 1 − Thermal-mechanical test.20
Figure A.1 − Load-time strength and damage limit of a core assembled with fittings.22
Figure A.2 – Graphical representation of the relationship of the damage limit to the
mechanical characteristics and service loads of an insulator with a 16 mm diameter
core .23
Figure A.3 – Test loads .24
Figure B.1 − Example of possible device 1 for sudden release of load.25
Figure B.2 − Example of possible device 2 for sudden release of load.26
Table 1 – Tests to be carried out after design changes .12
Table 2 – Design tests .13
Table 3 – Mounting arrangements for electrical tests .16
Table 4 – Sample sizes .17

– 4 – 61109 ¤ IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES –
COMPOSITE SUSPENSION AND TENSION 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 t
...