Comparative Performance Study of Dissolved Gas Analysis (DGA) Methods for Identification of Faults in Power Transformer

Table 16

Performance accuracy comparison of each DGA method.

Total cases	Roger’s ratio method	IEC ratio method	Doernenburg ratio method	Duval triangle method	Three-ratio method	Relative percentage of four gas methods	Key gas method
Number of total predictions	22	22	22	22	22	22	22
Total right predictions	15	16	11	18	20	17	19
Total wrong predictions	7	6	11	4	2	5	3
Total accuracy	68%	72%	50%	81%	90%	77%	86%