The data and ideas are taken from researach gate publication: It is a graphical method that allows one to follow the faults more easily and more precisely. One of the most frequently used DGA methods is Duval triangular. Various methods have been developed to interpret DGA results such as IEC ratio code, Rogers method and Duval triangle method. Dissolved gas analysis (DGA) is one of the most useful techniques to detect incipient faults in oil-filled power transformers. It is of great importance for the utilities to find the incipient faults in these transformers as early as possible. Monitoring and diagnosis of electrical equipment, in particular power transformers, has attracted considerable attention for many years.
