IS 3188-1980

标准号：IS 3188-1980
发布日期：1980/12/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard applies to string insulator units of the cap and pin type with porcelain insulating parts intended for ac overhead power lines with nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz.1.2 This standard applies to string insulator units of the cap and pin type with ball and socket couplings or clevis and tongue couplings.1.3 This standard applies to string insulator units for use on overhead power lines situated in atmospheres with no significant pollution. It may be applied to insulators intended for polluted atmospheres, in which case it will be necessary to modify certain dimensions. In any case, it is recommended that the standardized mechanical characteristics of this standard should be followed in such cases also.