prEN IEC 61109:2023

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

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

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

Izolatorji za nadzemne vode - Sestavljeni obesni nosilni in strižni zatezni izolatorji za izmenične sisteme z nazivno napetostjo nad 1 000 V - Definicije, preskusne metode in prevzemna merila

General Information

• Status: Not Published
• Publication Date: 06-Jul-2025
• ICS: 29.080.10 - Insulators
• Technical Committee: CLC/SR 36 - Insulators for substations
• Drafting Committee: IEC/TC 36 - IEC_TC_36
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 01-Mar-2024
• Completion Date: 01-Mar-2024
• Ref Project: oSIST prEN IEC 61109:2024 - 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

Relations

• Revises: EN 61109:2008 - 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
• Effective Date: 25-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2024
Izolatorji za nadzemne vode - Sestavljeni obesni in strižni izolatorji za izmenične
sisteme z nazivno napetostjo nad 1 000 V - Definicije, preskusne metode in
prevzemna merila
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
Isolatoren für Freileitungen - Verbund-Hänge- und -Abspannisolatoren für
Wechselstromsysteme mit einer Nennspannung über 1 000 V - Begriffe, Prüfverfahren
und Annahmekriterien
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
Ta slovenski standard je istoveten z: prEN IEC 61109:2023
ICS:
29.080.10 Izolatorji Insulators
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

36/590/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61109 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-12-08 2024-03-01
SUPERSEDES DOCUMENTS:
36/583/RR
IEC TC 36 : INSULATORS
SECRETARIAT: SECRETARY:
Sweden Mr Dan Windmar
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 11
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
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CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
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

PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.

IEC CDV 61109 © IEC 2023 2 36/590/CDV

1 CONTENTS
2 CONTENTS . 2
3 FOREWORD. 5
4 INTRODUCTION . 7
5 1 Scope and object . 8
6 2 Normative references . 8
7 3 Terms, definitions and abbreviations . 8
8 3.1 Terms and definitions . 9
9 3.22 Abbreviations . 12
10 4 Identification . 12
11 5 Environmental conditions . 12
12 6 Transport, storage and installation . 13
13 7 Tolerances . 13
14 8 Classification of tests . 14
15 8.1 Design tests . 14
16 8.2 Type tests . 14
17 8.3 Sample tests . 15
18 8.4 Routine tests . 15
19 9 Design tests . 18
20 9.1 General . 18
21 9.2 Test specimens for IEC 62217 . 18
22 9.2.1 Tests on interfaces and connections of end fittings . 18
23 9.2.2 Tracking and erosion test . 19
24 9.2.3 Tests on core material . 19
25 9.2.4 Tests on core with housing . 19
26 9.3 Product specific pre-stressing for tests on interfaces and connections of end
27 fittings as in IEC 62217 . 19
28 9.3.1 Sudden load release . 19
29 9.3.2 Thermal-mechanical pre-stress . 19
30 9.4 Assembled core load-time tests . 20
31 9.4.1 Test specimens . 20
32 9.4.2 Mechanical load test . 20
33 10 Type tests . 21
34 10.1 Electrical tests on string insulator units . 21
35 10.2 Damage limit proof test and test of the tightness of the interface between
36 end fittings and insulator housing . 22
37 10.2.1 Test specimens . 22
38 10.2.2 Performance of the test . 23
39 10.2.3 Evaluation of the test . 23
40 11 Sample tests . 23
41 11.1 General rules . 23
42 11.2 Verification of dimensions (E1 + E2) . 25
43 11.3 Verification of the end fittings (E2) . 25
44 11.4 Verification of tightness of the interface between end fittings and insulator
45 housing (E2) and of the specified mechanical load, SML (E1) . 25
46 11.5 Galvanizing test (E2) . 26
47 11.6 Minimum sheath thickness. (E1) . 26
48 11.7 Re-testing procedure . 27
49 12 Routine tests . 28

IEC CDV 61109 © IEC 2023 3 36/590/CDV

50 12.1 Mechanical routine test . 28
51 12.2 Visual examination . 28
52 Annex A (informative) Principles of the damage limit, load coordination and testing for
53 composite suspension and tension insulators . 29
54 A.1 Introductory remark . 29
55 A.2 Load-time behaviour and the damage limit . 29
56 A.3 Service load coordination . 30
57 A.4 Verification tests . 34
58 Annex B (informative) Example of two possible devices for sudden release of load . 35
59 B.1 Device 1 (Figure B.1) . 35
60 B.2 Device 2 (Figure B.2) . 35
61 Annex C (informative) Guidance on non-standard mechanical stresses and dynamic
62 mechanical loading of composite insulators . 37
63 C.1 Introductory remark . 37
64 C.2 Torsion loads . 37
65 C.3 Compressive (buckling) loads . 37
66 C.4 Bending loads. 38
67 C.5 Dynamic mechanical loads . 38
68 C.6 Limits . 38
69 Annex D (informative) Electric field control for AC . 39
70 Annex E (informative) Typical sketches for composite insulator assemblies . 41
71 Annex F (informative) Mechanical evaluation of the adhesion between core and
72 housing . 42
73 F.1 Introduction . 42
74 F.2 Method A: Pull-off test . 42
75 F.2.1 Specimens . 42
76 F.2.2 Procedure . 43
77 F.3 Method B: Peel test . 44
78 F.3.1 Specimens . 44
79 F.3.2 Procedure . 45
80 F.4 Method C: Shear test . 45
81 F.4.1 Specimens . 45
82 F.4.2 Procedure . 46
83 Annex G (informative) Applicability of design- and type tests for DC applications . 47
IEC CDV 61109 © IEC 2023 4 36/590/CDV

85 Figure 1 − Thermal-mechanical pre-stressing . 20
86 Figure 3 − Method of re-testing at different stages . 27
87 Figure A.1 − Load-time strength and damage limit of a core assembled with fittings . 30
88 Figure A.2 – Graphical representation of the relationship of the damage limit to the
89 mechanical characteristics and service loads of an insulator with a 16 mm diameter
90 core 31
91 Figure A.3 – Applied specific force relationship example 1 . 32
92 Figure A.4 – Applied specific force relationship example 2 . 33
93 Figure A.5 – Test loads . 34
94 Figure B.1 − Example of possible device 1 for sudden release of load . 35
95 Figure B.2 − Example of possible device 2 for sudden release of load . 36
96 Figure C.1 – Example of compression loads in V-string assemblies . 38
97 Figure E.1.- Interface description for insulator with housing made by modular assembly
98 and external sealant . 41
99 Figure E.2.- Interface description for insulator with housing made by injection molding
100 and overmolded end fitting . 41
101 Figure F.1 − Example for type of housing separation . 42
102 Figure F.2 − Example of test object for pull-off test and application clamping and force
103 43
104 Figure F.3 − Relevant dimensions for the calculation of the area of the pull-off section
105 44
106 Figure
...