AS 60305-2007 pdf free download

AS 60305-2007 pdf free download.Insulators for overhead lines with a nominal voltage above 1000 V Ceramic or glass insulator units for a.c. systems Characteristics of insulator units of the cap and pin type.
This AS 60305 applies to string insulator units of the cap and pin type with insulating parts of ceramic material or glass. intended for a c. overhead lines with a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz. It also applies to insulators of similar design used in substations.
This standard applies to string insulator units of the cap and pin type either with ball and socket couplings or with clevis and tongue couplings.
This standard applies to string insulator units for use on overhead lines in clean areas and polluted areas. For use in areas characterized by very heavy pollution levels and for other particular or extreme environmental conditions, it may be necessary for certain dimensions to be changed and insulator units having different creepage distances, spacing and forms may be preferred (for example, flat profile, hemispherical etc.). Insulators for use on d.c. systems may also need different dimensions. In any case, it is recommended that the standardized mechanical characteristics of the present International Standard and coupling sizes are retained
The object of this standard is to prescribe specified values for the mechanical characteristics and for the main dimensions of string insulator units of the cap and pin type.
The power frequency, lightning impulse and puncture withstand voltages of string insulator units are not specified in this standard. IEC 60383-1 gives the electrical characteristics which define string insulator units; their values shall be agreed between purchaser and manufacturer.
Ball and socket couplings are covered by IEC 60120, clevis and tongue couplings by
IEC 60471.
NOTE — For the definition of pollution levels see iEC 60815.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below Members of IEC and ISO maintain registers of currently valid International Standards.AS 60305-2007 pdf free download.