Power Transformer Fault Severity Estimation Based on Dissolved Gas Analysis and Energy of Fault Formation Technique

Table 6

Comparison of different fault detecting diagnostic approaches with respect to fault type.

Fault type	Total faulty cases	Fuzzy Duval-EWR method [22]		Fuzzy IEC-EWR method [20]		Proposed fuzzy key gas-TFE method
		Correct diagnosis	% accuracy	Correct diagnosis	% accuracy	Correct diagnosis	% accuracy
Partial discharges	7	7	100	7	100	7	100
Discharges of low energy	11	10	91.9	10	91.9	9	81.8
Discharges of high energy	22	21	95.9	21	95.9	20	90.9
Low-level thermal faults	13	12	92.3	13	100	13	100
Medium-level thermal faults	19	16	84.2	16	84.2	15	78.9
High-level thermal faults	12	10	83.3	10	83.3	9	75