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

Table 5

Test data of 20 transformers rated between 20MVA and 175MVA (88 kV–420 kV).

Tx no	Year of installation	H2 (ppm)	CH4 (ppm)	C2H2 (ppm)	C2H6 (ppm)	C2H4 (ppm)	CO2 (ppm)	CO (ppm)	Furans (ppm)	Moisture (ppm)	Acidity (mg KOH/g)	BDV (kV)	DDF (%)	IFT (dynes/ cm)	Colour	HST (°C)	Load (pu)
Tx1	1996	234	300	52	56	29	5495	700	0.25	22	0.07	52	0.14	30	1.5	60	0.58
Tx2	—	607	119	3	257	67	2011	189	1.37	23	0.13	44	0.264	24	2	61	0.6
Tx3	1996	32.5	45.8	17	25.54	21.31	3685	697	0.49	16.5	0.058	61	0.174	27	2	49	0.57
Tx4	1986	74	347	35	194	172	22789	8197	4.5	28	0.18	40	0.266	20	2.5	78	0.61
Tx5	—	71	65	18	127	79	4567	582	1.1	19	0.15	38	0.185	23	2.5	58	0.44
Tx6	2000	107	129	0	55	68	7038	892	0.1	26	0.09	48	0.249	25	1.5	66	0.65
Tx7	1981	979	236	112	183	180	2492	1843	5.76	23.2	0.251	51.7	0.458	26	3	75	0.72
Tx8	1976	1498	395	26	323	395	12371	1582	3.9	33	0.19	35	0.593	25	4	66	0.48
Tx9	1996	294	748	6	212	1348	6764	669	0.83	9	0.08	49	0.1	35	2.5	77	0.75
Tx10	—	163	106	9	298	1517	2348	299	4.48	42	0.22	46	0.221	21	3.5	64	0.45
Tx11	1998	151	8	8	151	10	2323	297	0.22	6	0.13	64	0.566	27	2	68	0.5
Tx12	—	678	368	163	92	108	1139	162	0.16	11	0.05	70	0.113	38	1	81	0.82
Tx13	2015	893	724	1	6	18	1883	242	0.03	9	0.04	71	0.068	45	0	56	0.55
Tx14	1995	195	660	22	127	79	3347	356	0.09	6	0.03	66	0.207	41	1	53	0.6
Tx15	1990	440	522	183	31	62	5382	685	0.31	12	0.05	65	0.319	28	2	50	0.66
Tx16	2010	15	8	0	9	5	7135	902	0.1	10	0.03	55	0.15	42	1	61	0.44
Tx17	2005	1176	4	1	4	10	4991	637	0.83	10	0.09	62	0.733	29	1.5	53	0.5
Tx18	—	441	678	55	73	62	13345	1695	5.1	32	0.25	55	0.328	26	3	77	0.62
Tx19	2000	75	44	0	106	13	7846	261	2.4	40	0.092	31	0.416	22	3	61	0.55
Tx20	2002	181	79	21.1	56	29	713	192.6	8.91	21.2	0.349	33.5	0.257	20	3	50	0.5