Dissolved gas analysis has gained worldwide acceptance as a method for the detection of incipient faults. When properly applied, the method provides a highly reliable and sensitive method for the identification of fault type and for the assessment of the rate of fault development.
This paper investigates the origins of the individual fault gases, factors that are responsible for the extreme sensitivity of the method, and the factors that influence the observed gas concentrations. The paper also examines the scope and limitations of the diagnostic techniques that have been developed to interpret the data that the method provides. These techniques include such concepts as key gases, ratios of gas concentrations, nomographs, and rates of gas generation.
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