AS 61109:2020 pdf Insulators for overhead lines — Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1 000 V
1 Scope and object
This International Standard applies to composite suspension/tension 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 insulators covered by this standard are intended for use as suspension/tension line
insulators, but it should be noted that these insulators can occasionally be subjected to
compression or bending, for example when used as phase-spacers.
This standard can be applied in part to hybrid composite insulators where the core is made of a
homogeneous material (porcelain, resin), see Clause 8.
The object of this standard is to
– define the terms used,
– prescribe test methods,
– prescribe acceptance 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 61 466-1 , Composite string insulator units for overhead lines with a nominal voltage
greater than 1 000 V – Part 1: Standard strength classes and end fittings
IEC 6221 7:2005, Polymeric insulators for indoor and outdoor use with a nominal voltage
> 1 000 V – General definitions, test methods and acceptance criteria
ISO 3452 (all parts), Non-destructive testing – Penetrant testing
3 Terms, definitions and abbreviations
For the purposes of this document, the following terms, definitions and abbreviations apply.
NOTE? Certain terms from IEC 6221 7 are reproduced here for ease of reference. Additional definitions applicable
to insulators can be found in IEC 60050-471 [6].
3.1 Terms and definitions
3.1 .1 polymeric insulator
insulator whose insulating body consists of at least one organic based material
NOTE 1 Polymeric insulators are also known as non-ceramic insulators.
NOTE 2 Coupling devices may be attached to the ends of the insulating body.
[IEV 471 -01 -1 3]
3.1 .2 composite insulator
insulator made of at least two insulating parts, namely a core and a housing equipped with
metal fittings
NOTE Composite insulators, for example, can consist either of individual sheds mounted on the core, with or without an intermediate sheath, or alternatively, of a housing directly moulded or cast in one or several pieces on to the core.[IEV 471 -01 -02]
3.1 .3 core of a composite insulator
internal insulating part of a composite insulator which is designed to ensure the mechanical
characteristics
NOTE 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]
3.1 .4 insulator trunk
central insulating part of an insulator from which the sheds project
NOTE Also known as shank on smaller insulators.
[IEV 471 -01 -1 1 ]
3.1 .5 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]
AS 61109:2020 pdf Insulators for overhead lines — Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1 000 V
