All transformers generate gases during their normal operation as a result of aging and oxidation exclusive of abnormalities. From an operational point of view, it is important to, first, detect and recognize the existance of a problem by observing or detecting deviations from gases considered normal, second, to evaluate the impact on the operation of the transformer (serviceability), and, lastly, to take appropriate action, such as removal from service or increased monitoring frequency. This paper will address these considerations from a utility's perspective using IEEE C57.104 as a guide.
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