Multiparameter-Based Fuzzy Logic Health Index Assessment for Oil-Immersed Power Transformers

Table 8

HI comparison accuracies for different methods for 134 test transformers.

Status	HI comparison of 134 test case transformers
	Utility estimation	Method in [8]	Method in [5]	Proposed method
Excellent	7	9	9	6
Good	28	26	26	27
Moderate	65	66	64	64
Bad	11	13	14	13
Worst	23	20	21	24
Total transformers	134	134	134	134
Overall % error against utility HI		7.5%	6.7%	4.5%