AS 61109:2020 pdf free.Insulators for overhead lines一Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria (IEC 61109:2008, MOD).
4 Identification
In addition to the requirements of IEC 62217, each insulator shall be marked with the SML.
It is recommended that each insulator be marked or labelled by the manufacturer to show that it has passed the routine mechanical test.
5 Environmental conditions
The normal environmental conditions to which insulators are submitted in service are defined in
IEC 62217.
6 Transport, storage and installation
In addition to the requirements of IEC 62217, information on handling of composite insulators can be found in CIGRE Technical Brochure 184 [7]. During installation, or when used in nonstandard configurations, composite suspension insulators may be submitted to high torsion, compression or bending loads for which they are not designed. Annex C gives guidance on catering for such loads.
7 Hybrid insulators
As stated in Clause 1, this standard can be applied in part to hybrid composite insulators where the core is made of a homogeneous material (porcelain, resin). In general, the load-time mechanical tests and tests for core material are not applicable to porcelain cores. For such insulators, the purchaser and the manufacturer shall agree on the selection of tests to be used from this standard and from IEC 60383-1.
8 Tolerances
Unless otherwise agreed, a tolerance of
± (0,04 x d + 1,5) mm when d< 300 mm,
± (0,025 x d + 6 ) mm when d> 300 mm with a maximum tolerance of ± 50 mm,
shall be allowed on all dimensions for which specific tolerances are not requested or given on the insulator drawing (d being the dimension in millimetres).
The measurement of creepage distances shall be related to the design dimensions and tolerances as determined from the insulator drawing. even if this dimension is greater than the value originally specified. When a minimum creepage is specified, the negative tolerance is also limited by this value.AS 61109 pdf download.