![]() ![]() ![]() One purpose of this paper is therefore to indicate in more detail how to use such coordinates. The Duval Triangle method is described in the IEC Standard and in these published reviews, however, users sometimes are not quite at ease with the use of triangular coordinates. Introduction Several methods of interpretation of DGA in transformers in service are provided in IEC Standard, the IEEE Guide C, as well as in published reviews on the subject 3-5. The minimum gas levels in service above which diagnoses may be attempted are indicated, as well as the gas levels observed before failure. It is shown how the accuracy of DGA laboratory results can affect the reliability of DGA diagnosis. A brief review on the interpretation of DGA in transformers is presented, with a special emphasis on the Duval Triangle method. 1 Dissolved Gas Analysis and the Duval Triangle By Michel Duval 1ģ DISSOLVED GAS ANALYSIS AND THE DUVAL TRIANGLE Michel Duval Abstract Dissolved gas analysis ( DGA ) is widely used to detect incipient faults in transformers. ![]()
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