scope:

This standard applies to outdoor and indoor power apparatus dc bushings of condenser type that have basic impulse insulation levels of 110 kV and above for use as components of oil-Þlled converter transformers and smoothing reactors, as well as air-to-air dc bushings. This standard does not apply to the following:

a) High-voltage cable terminations (potheads)

b) Bushings for instrument transformers c) Bushings for test transformers

d) Bushings in which the internal insulation is provided by a gas

e) Bushings applied with gaseous insulation (other than air at atmospheric pressure) external to the bushing

f) Bushings for distribution class transformers

Purpose

This standard deÞnes the special terms used, service conditions, rating, general requirements, electrical insulation characteristics, and test procedure for the bushings for dc application.