The purpose of this document is to provide a Guide for evaluating transformer condition using analytical tools and methods involving transformer mineral oil and associated developed gases.This guide applies to mineral-oil-immersed transformers and addresses: 1. The theory of combustible gas generation in a transformer; 2. The interpretation of gas analysis; 3. Suggested operating procedures; 4. Various diagnostic techniques, such as key gases, Dornenberg and Rogers ratios; Duval triangle; and other methods; 5. Instruments for detecting and determining the amount of combustible gases present; 6. Case studies; 7. Evaluation criteria and guidelines; 8. A bibliography of related literature.
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