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. Significant changes are indicative of an incipient fault condition. Once you establish a baseline, you can watch for trends in how the concentration of those gases change over time. Dielectric fluid inevitably contains a profile of trace gases, so every transformer with fluid has a fingerprint of these gases. What is DGA testing?ĭGA testing is one of the diagnostic tests we can run on the dielectric fluid in a power transformer. It is of great importance for the utilities to find the incipient faults in these transformers as early as possible.ĭissolved gas analysis (DGA) is one of the most useful techniques to detect incipient faults in oil-filled power.Various methods have been developed to interpret DGA results such as IEC ratio code, Rogers method and Duval triangle method. Monitoring and diagnosis of electrical equipment, in particular power transformers, considerable attention for many years.
