AS IEC 62217:2021 pdf download – Polymeric HV insulators for indoor and outdoor use — General definitions, test methods and acceptance criteria

03-03-2022 comment

AS IEC 62217:2021 pdf download – Polymeric HV insulators for indoor and outdoor use — General definitions, test methods and acceptance criteria.
3.1 4 coupling part of the fixing device which transmits load to the hardware external to the insulator 3.1 5 tracking process which forms irreversible degradation by formation of conductive paths (tracks) starting and developing on the surface of an insulating material. Note 1 to entry: Tracking paths are conductive even under dry conditions. 3.1 6 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. 3.1 7 crack any internal fracture or surface fissure of depth greater than 0,1 mm 3.1 8 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 -1 4, modified to define puncture as the result of a discharge, rather than the discharge itself] 4 Identification The manufacturer’s drawing shall show the relevant dimensions and information necessary for identifying and testing the insulator in accordance with this International Standard and the applicable IEC product standard(s). The drawing shall also show applicable manufacturing tolerances. Each insulator shall be marked with the name or trademark of the manufacturer and the year of manufacture. In addition, each insulator shall be marked with the rated characteristics specified in the relevant IEC product standards. These markings shall be legible, indelible and their fixings (if any) weather- and corrosion-proof.
7.2 Type tests The type tests are intended to verify the main characteristics of a polymeric insulator, which depend mainly on its shape and size. Type tests shall be applied to polymeric insulators belonging to an already qualified design class. The type tests shall be repeated only when the type of the polymeric insulator is changed. The parameters defining a type of polymeric insulator are given in the relevant product standard. The applicable type tests are given in the relevant product standard. 7.3 Sample tests The sample tests are intended to verify the characteristics of polymeric insulators which depend on the quality of manufacture and on the materials used. They are made on insulators taken at random from lots offered for acceptance. The applicable sample tests are given in the relevant product standard. 7.4 Routine tests These tests are intended to eliminate polymeric insulators with manufacturing defects. They are carried out on every insulator to be supplied. The applicable routine tests are given in the relevant product standard. 8 General requirements for insulator test specimens Insulator test specimens for tests of polymeric insulators shall be checked prior to tests: • for correct assembly, for example by applying the mechanical routine test specified in the relevant product standard, • by visual examination according to the relevant product standard; • for conformance of dimensions with the actual drawing.
9.2.6 Water immersion pre-stressing The specimens shall be kept immersed in a vessel, in boiling de-ionized water with 0,1 % by weight of NaCl, for 42 h. Alternatively, tap water may be used with salt added to obtain a conductivity of 1 750 µS/cm ± 80 µS/cm at 20 °C. For a different water temperature, the conductivity correction as given in IEC 60507:1 991 , Clause 7 shall be applied. At the end of boiling, the specimens are allowed to cool and shall remain in water until the verification tests start in the following sequence. If transport is necessary in this period, the wet insulators may be put in sealed plastic bags or another suitable container for a maximum of 1 2 h. 9.2.7 Verification tests General The time interval between the following individual tests shall be such that the verification tests are completed within 48 h. Visual examination The housing of each specimen is inspected visually. No cracks are permissible. Steep-front impulse voltage test Procedure The test specimens shall be fitted with sharp-edged electrodes (consisting of clips, e.g. made of a copper strip approximately 20 mm wide and less than 1 mm thick). These electrodes are fitted firmly around the housing between sheds so positioned to form sections of axial length of about 500 mm or smaller. The voltage shall be applied to the original metal fittings in case of insulators with a distance between end fittings smaller than, or equal to, 500 mm.

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