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

Table 7

Health index status by different methods for 20 different test transformers.

Tx. No	Transformer health index level and description
	Utility estimation	Method in [8]		Method in [5]		Proposed method
Tx1	Good	0.275	Good	0.275	Good	0.278	Good
Tx2	Moderate	0.552	Moderate	0.572	Moderate	0.657	Moderate
Tx3	Excellent	0.120	Excellent	0.143	Excellent	0.28	Good
Tx4	Worst	0.936	Worst	0.972	Worst	0.992	Worst
Tx5	Moderate	0.5	Moderate	0.452	Moderate	0.498	Moderate
Tx6	Good	0.273	Good	0.275	Good	0.275	Good
Tx7	Worst	0.832	Bad	0.894	Bad	0.944	Bad
Tx8	Worst	0.991	Worst	0.99	Worst	0.992	Worst
Tx9	Moderate	0.752	Bad	0.52	Moderate	0.528	Moderate
Tx10	Bad	0.899	Bad	0.934	Bad	0.991	Worst
Tx11	Good	0.225	Good	0.233	Good	0.248	Good
Tx12	Good	0.264	Good	0.273	Good	0.275	Good
Tx13	Excellent	0.083	Excellent	0.083	Excellent	0.12	Excellent
Tx14	Excellent	0.12	Excellent	0.122	Excellent	0.121	Excellent
Tx15	Moderate	0.45	Moderate	0.51	Moderate	0.525	Moderate
Tx16	Excellent	0.08	Excellent	0.104	Excellent	0.12	Excellent
Tx17	Good	0.25	Good	0.278	Good	0.348	Good
Tx18	Worst	0.887	Bad	0.9	Bad	0.991	Worst
Tx19	Worst	0.913	Bad	0.926	Bad	0.931	Bad
Tx20	Worst	0.98	Worst	0.983	Worst	0.992	Worst