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A field survey of transformer oil quality

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2 Author(s)
W. J. Degnan ; General Electric Company, Pittsfield, Mass. ; E. J. Shimanski

REDUCTION of power transformer insulation by the recently recommended two full basic insulation levels1 has placed renewed emphasis on oil quality. The design of corona-free transformers has eliminated the use of sharpedged electrodes in highly stressed locations, favoring the more uniform dielectric field conditions. Because contamination in these uniform fields has a much greater influence on dielectric strength that in nonuniform fields, the question of oil quality is of further importance.

Published in:

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics  (Volume:75 ,  Issue: 5 )