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Improving the accuracy of transformer DGA diagnosis in the presence of conflicting evidence

Aizpurua, Jose Ignacio and Catterson, Victoria M. and Stewart, Brian G. and McArthur, Stephen D. J. and Lambert, Brandon and Ampofo, Bismark and Pereira, Gavin and Cross, James G. (2017) Improving the accuracy of transformer DGA diagnosis in the presence of conflicting evidence. In: 2017 IEEE Electrical Insulation Conference (EIC). IEEE, Piscataway, NJ. ISBN 9781509039654

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Transformers are critical assets for the reliable and cost-effective operation of the power grid. Transformers may fail if condition monitoring does not identify degraded conditions in time. Dissolved Gas Analysis (DGA) focuses on the examination of the dissolved gasses in the transformer oil and there exist different methods for transformer fault diagnosis based on different analyses of the gassing levels. However, these methods can give conflicting results, and it is not always clear which model is most accurate in a given situation. This paper presents a novel evidence combination framework for DGA based on Bayesian networks. Bayesian network models embed expert knowledge along with learned data patterns and evidence combination which aids in the consistency of analysis. The effectiveness of the proposed framework is validated using the IEC TC 10 dataset with a maximum diagnosis accuracy of 88.3%.