Dissolved gas analysis (DGA) method is an essential and efficient method for incipient fault detection of an oil-immersed power transformer. Condition assessment is often conducted by using DGA fault interpretation methods, but, little consideration has been given to the measurement uncertainty of dissolved gases. This paper is focused on the analysis of current DGA interpretation methods under a condition of reasonable measurement error. The measurement error is obtained by analysis of the accuracy of IEC/CIGRE laboratories. New variants of DGA gas records are generated by using ±10% as the measurement error rate. Duval Triangle, IEC, Roger and Doemenburg methods are re-examined with the DGA original gas records and their variants for error redundancy investigation. Three specific zones of Duval Triangle are concluded for improving its reliability performance. Shortcomings of interpretation codes in IEC, Roger and Doemenburg methods, which affect the fault detection performance, are discussed.
Investigate Transformer Fault Diagnosis Performance of Dissolved Gas Analysis with Measurement Error
Electric power components and systems ; 45 , 8 ; 894
2017
Article (Journal)
English
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