High-voltage bushings designed to meet modern service

BUSHINGS are a very important part of over — all system insulation. Since all of the power transmitted from station to station and station to consumer passes through a great many bushings the majority of which are a part of vital equipment such as transformers, breakers, etc., it is immediately apparent that system — service continuity depends, to a large degree, upon satisfactory bushing operation. Early bushing designers were handicapped by a lack of operating history and high-voltage testing facilities. However, in spite of these handicaps they developed some sound designs as evidenced by the many 25 — to 30 — year — old bushings in satisfactory service today. In these early bushings porcelain was one of the principal dielectrics