Integration of Duval Pentagon to the Multi-Method Interpretation to Improve the Accuracy of Dissolved Gas Analysis Technique

Dissolved Gas Analysis (DGA) is the most effective method for detecting the gas abnormality in transformer insulating oil due to the thermal and electrical stresses received when the transformer operates. Various DGA interpretation techniques have developed rapidly. Each has its advantages and disadvantages. However, it is possible to misinterpret one oil sample. Besides that, the engineer's experiences and knowledge still have the most significant role in predicting the DGA sample subjectively. The multi-method interpretation technique is a method that is quite relevant to cover various techniques in increasing consistency and accuracy rate. This paper proposes Duval Pentagon Method (DPM) integration as the recent interpretation of the multi-method techniques. The method was developed based on IEC 10 TC database, then validated with 52 samples from previous researches. The results showed that there was a significant increase in accuracy and consistency rate with the multi-method using DPM integration. This method produces the highest level of accuracy, 96.15%, and consistency of 90.48% compared to others DGA interpretation techniques.