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High voltage bushings play a critical role in the operation of the transformer and when the bushing fails the results can be catastrophic causing considerably collateral damage and posing a risk to safety of personnel. A time-based-maintenance scheme based on manufacturer's manual has already been proved to be not sufficient to recognize rapid degradation of insulation in the high voltage bushing...
This paper reviews progress in paper degradation assessment in service aged transformers from four existing methods, including measurements of furans (2FAL), measurements of methanol (MeOH), analysis of dissolved gases in oil (DGA) and forensic investigation. Practical recommendations towards more reliable paper degradation assessment for in-service transformers are suggested, including a composite...
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