Determination of faults severity in power transformers immersed in mineral insulated oil based exclusively on the DGA and by evaluating the NEI
DOI:
https://doi.org/10.37636/recit.v43208223Keywords:
Power transformer, Mineral insulating oil, Dissolved gas analysis (DGA), Normalized energy intensity (NEI), EnthalpyAbstract
The power transformer is a major part of an electric system, it is necessary to know their condition in order to solve incipient faults, DGA technique in mineral insulating oil is widely used to diagnose the equipment, however, is not easy to interpret the results because it is hard to know the severity of the detected fault. Recent studies mention a way to evaluate it called “Normalized Energy Intensity” (Jakob & Dukarm, 2015) which incorporates the thermodynamic theory to the decomposition of mineral insulated oil. In this article, the analysis of 24 power transformers operating under different conditions was considered to do a comparative study between Dissolved Gas Analysis and Normalized Energy Intensity interpretation techniques in order to evaluate the severity of the detected faults. The obtained result was a more accurate diagnosis of the transformers before presenting major failures. It was determined that the interpretative technique NEI is more sensitive to DGA, allowing that the quantification of the transformer fault severity to be closer to the insulated mineral oil real condition degradation.
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Copyright (c) 2021 Bethsaida Adriana Gutiérrez Chávez, Georgina Montes de Oca-Ramírez
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