Integrated Transformer Health Estimation Methodology Based on Markov Chains and Evidential Reasoning

Table 8

Inspection grades and assessment results.

		Magnetic core 3		Geometry end electric contacts of windings, 4		Insulation, 4		Bushings, 5		On-line tap changer, 5		Oil, 4		DGA, 5		Tank, 2		HI [0–3]	Total HI [0–100%]	Validity ažurnost	Expert	Equation (3)	ER	E 5	Dev equation (3)	Dev ER	Dev equation (5)
		HI	V	HI	V	HI	V	HI	V	HI	V	HI	V	HI	V	HI	V
1	1983	3	10	2.5	10	3	6.67	0	10	3	10	1.44	10	3	10		0	0.74	24.67	83.34	0	2.76	0.41	0.616716	2.76	0.41	0.616716
2		3	5	1.5	2.5	3	6.67	0	0	3	0	3	10	3	10	3	10	0.78	26	55.21	0	2.49	0.41	0.430638	2.49	0.41	0.430638
18	1986	3	10	3	10	2.67	10		0	1	10	3	10	3	10	3	10	1.79	59.67	87.5	0	1.08	0.2	1.56625	1.08	0.2	1.56625
17	1979	3	10	1.5	5	3	6.67	3	10	3	0	3	5	3	0		0	1.9	63.33	45.84	0.6	1.23	1.21	0.87096	0.63	0.61	0.27096
13	1958	3	10	3	10	2	10		0	1	10	2	10	3	10	2.56	10	1.65	55	87.5	0.75	0.93	1.47	1.44375	0.18	0.72	0.69375
5	1969	3	10	3	10	3	10	3	10	1	10	3	10	3	10	3	10	1.84	61.33	100	1.35	1.78	1.4	1.84	0.43	0.05	0.49
8	1972	3	10	3	10	2.67	8.33	3	10	1	10	3	10	3	10	3	10	1.82	60.67	97.91	1.35	2.58	1.4	1.781962	1.23	0.05	0.431962
7	1968	3	10	2.5	10	2.38	6.67	1	0	3	10	3	10	3	10	3	10	1.77	59	83.34	1.5	2.11	1.6	1.475118	0.61	0.1	0.024882
9	1962	2	10	1.25	10	1.42	10		0	3	10	2	10	3	10	3	10	1.62	54	87.5	1.5	2.58	1.6	1.4175	1.08	0.1	0.0825
11	1978	3	10	3	10	3	10		0	3	10	3	10	3	10	1.22	10	1.93	64.33	87.5	1.5	2.2	1.9	1.68875	0.7	0.4	0.18875
19	1972	3	10	3	10	3	10		0	1	10	2.44	10	3	10	2.44	10	1.75	58.33	87.5	1.5	2.15	1.7	1.53125	0.65	0.2	0.03125
23	1989	3	10	1.5	5	3	6.67	3	10	3	0	3	5	3	0		0	1.9	63.33	45.84	1.5	2.78	2.23	0.87096	1.28	0.73	0.62904
4	1971		0	3	0	2.33	6.67	3	10	0	0	1.44	5	3	10		0	0.7	23.33	39.59	1.65	2.64	1.8	0.27713	0.99	0.15	1.37287
12	1988		0	3	5	3	6.67	3	10	3	10	3	5	2	0		0	2.81	93.67	45.84	1.65	2.78	2.24	1.288104	1.13	0.59	0.361896
20	2013		0	3	5	3	6.67	3	10	3	10	3	10	3	10	3	10	3	100	77.09	1.65	2.11	1.8	2.3127	0.46	0.15	0.6627
6	1968		0		0	3	5	3	5		0	1.44	10	3	10	3	5	1.84	61.33	43.75	1.8	2.22	1.7	0.805	0.42	0.1	0.995
16	1980		0	3	5	3	10	3	10	3	10	3	10	3	10		0	3	100	68.75	1.8	1.23	1.22	2.0625	0.57	0.58	0.2625
22	1971	0	10	0	10	0.58	6.67		0	3	10	3	5	0	0		0	0.39	13	52.09	1.8	2.95	2.74	0.203151	1.15	0.94	1.596849
21	1965	3	10	2.5	10	3	10	3	10	2	10	2.56	10	3	10	2.56	10	2.7	90	100	1.95	2.72	1.9	2.7	0.77	0.05	0.75
24	1968	3	10	3	10	2.67	10	3	10	3	10	2.44	10	3	10	3	10	2.89	96.33	100	1.95	2.71	2.43	2.89	0.76	0.48	0.94
3	1978	3	10	3	10	3	10		0	3	10	3	10	3	0	2.56	10	2.97	99	75	2.1	2.54	2.2	2.2275	0.44	0.1	0.1275
10	1982	3	10	1.5	5	2.67	10	3	10	3	10	2.56	10	3	10	3	10	1.86	62	93.75	2.1	1.49	1.7	1.74375	0.61	0.4	0.35625
25	1980	3	10	1.5	5	3	6.67	2	5	3	0	3	5	3	0		0	1.82	60.67	39.59	2.1	2.43	2.56	0.720538	0.33	0.46	1.379462
14	1954	3	10	3	10	1.46	6.67		0	3	10	2.44	10	3	10	3	10	1.84	61.33	83.34	2.25	1.38	1.23	1.533456	0.87	1.02	0.716544
26	1986	3	10	3	10	3	10	3	10	3	10	3	10	3	10	3	10	3	100	100	2.25	2.64	2.23	3	0.39	0.02	0.75
27	1974	3	10	3	10	2.58	10	3	10	3	10	3	10	2	10		0	2.78	92.67	87.5	2.25	2.11	1.56	2.4325	0.14	0.69	0.1825
15		3	10	2.5	10	3	3.33	3	10	3	10		0		0		0	2.9	96.67	54.16	3	1.53	1.24	1.57064	1.47	1.76	1.42936
28	1978	3	10	3	10	2.58	10		0	3	10	1.44	10	3	10		0	1.84	61.33	75	3	2.58	2.54	1.38	0.42	0.46	1.62
29	1978	3	10	3	10	3	10	3	10	3	10	3	10	3	10	3	10	3	100	100	3	3	2.74	3	0	0.26	0
30	1974	3	10	3	10	3	6.67	3	10	3	10	1	5	3	10		0	1.87	62.33	77.09	3	3	2.74	1.441583	0	0.26	1.558417