AS IEC 62217 pdf download

AS IEC 62217 pdf download.Polymeric HV insulators for indoor and outdoor use – General definitions, test methods and acceptance criteria
1 Scope and object
This International Standard is applicable to polymeric insulators whose insulating body consists of one or various organic materials. Polymeric insulators covered by this standard include both solid core and hollow insulators. They are intended for use on HV overhead lines and in indoor and outdoor equipment. The object of this standard is to define the common terms used for polymeric insulators; to prescribe common test methods for design tests on polymeric insulators; – to prescribe acceptance or failure criteria, if applicable; These tests, criteria and recommendations are intended to ensure a satisfactory life- time under normal operating and environmental conditions (see Clause 5). This standard shall only be applied in conjunction with the relevant product standard.
3 Terms and definitions
For the purposes of this document the terms and definitions given in IEC 60050-47 1:2007 and the following apply: 3.1 high voltage (HV) voltage over 1 000 V a.c. or over 1 500 V d.c. or over 1 500 V peak value 3.2 polymeric insulator insulator whose insulating body consists of at least one organic based material Note 1 to entry: Polymeric insulators are also known as non-ceramic insulators. Note 2 to entry: Coupling devices may be attached to the ends of the insulating body. [SOURCE: IEC 60050-471:2007, 471-01-13] 3.3 resin insulator polymeric insulator whose insulating body consists of a solid shank and sheds protruding from the shank made from only one organic based housing material (e.g. cycloaliphatic epoxy) 3.4 composite insulator insulator made of at least two insulating parts, namely a core and a housing equipped with metal fittings Note 1 to entry: 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. [SOURCE: IEC 60050-471:2007, 471-01-02] 3.5 core central insulating part of an insulator which provides the mechanical characteristics Note 1 to entry: The housing and sheds are not part of the core. [SOURCE: IEC 60050-471:2007, 471-01-03] 3.7 housing external insulating part of a composite insulator providing the necessary creepage distance and protecting core from environment Note 1 to entry: An intermediate sheath made of insulating material may be part of the housing. [SOURCE: IEC 60050-47 1:2007, 471-01-09] 3.8 Shed (of an insulator) insulating part, projecting from the insulator trunk, intended to increase the creepage distance Note 1 to entry: The shed can be with or without ribs. [SOURCE: IEC 60050-471:2007, 471-01-15] creepage distance shortest distance or the sum of the shortest distances along the surface on an insulator between two conductive parts which normally have the operating voltage between them Note 1 to entry: The surface of cement or of any other non-insulating jointing material is not considered as forming part of the creepage distance. Note 2 to entry: If a high resistance coating is applied to parts of the insulating part of an insulator, such parts are considered to be effective insulating surfaces and the distance over them is included in the creepage distance. [SOURCE: IEC 60050-47 1:2007, 471-01-04] 3.10 arcing distance shortest distance in air external to the insulator between the metallic parts which normally have the operating voltage between them [SOURCE: IEC 60050-471:2007, 471-01-01] 3.11 interfaces surface between the different materials Note 1 to entry: 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. 3.16 erosion irreversible and non-conducting degradation of the surface of the insulator that occurs by loss of material. This can be uniform, localized or tree-shaped Note 1 to entry: Light surface traces, commonly tree-shaped, can occur on composite insulators as on ceramic insulators, after partial flashover. These traces are not considered to be objectionable as long as they are non- conductive. When they are conductive they are classified as tracking. 3.17 crack any internal fracture or surface fissure of depth greater than 0,1 mm 3.18 puncture permanent loss of dielectric strength due to a disruptive discharge passing through the solid insulating material of an insulator [SOURCE: IEC 60050-471:2007, 471-01-14, modified to define puncture as the result of a discharge, rather than the discharge itself]