Modification of Duval triangle for diagnostic transformer fault through a procedure of dissolved gases analysis

Sobhy S. Desouky, Ahmed E. Kalas, R. A. Abd El-Aal, Abdel Moneim M. Hassan
2016 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)  
Dissolved gas-in-oil analysis (DGA) is a sensitive and dependable technique for the detection of incipient fault condition within oil-immersed transformers. When the mineral oil is subjected to high thermal or/and electrical stresses, it decomposes and, as a result, gases are generated. This paper presents modification of Duval triangle DGA diagnostic graph to numerical method that is easy to use for diagnosing and a Matlab program. To study such as the following evaluation. This evaluation is
more » ... arried out on DGA data obtained from three different groups of transformers each group are two identical transformers. A Matlab program was developed to automate the evaluation of Duval Triangle graph to numerical modification, Also the fault gases can be generated due to oil decomposing effected by transformer over excitation which increasing the transformer exciting current lead to rising the temperature inside transformer core beside the other causes.
doi:10.1109/eeeic.2016.7555796 fatcat:7qav46bsijdohasno5fmnuujby