Calculation of a Health Index of Oil-Paper Transformers Insulation with Binary Logistic Regression

Table 11

Health index and health condition of transformer.

Number	HI		HI in [1]		AMHA HI
1	0.434	M	0.36	G	0.377	G
2	0.17	G	0.3	G	0.334	G
3	0.007	G	0.3	G	0.29	G
4	0.826	VB	0.78	B	0.7	B
5	0.002	G	0.2	VG	0.102	G
6	0.004	G	0.3	G	0.274	G
7	0.023	G	0.3	G	0.316	G
8	0.006	G	0.3	G	0.29	G
9	0.003	G	0.22	VG	0.226	G
10	0.12	G	0.3	G	0.316	G
11	0.973	VB	0.94	VB	1	B
12	0.841	VB	0.93	VB	0.931	B
13	0.973	VB	0.94	VB	1	B
14	0.589	B	0.83	B	0.916	B
15	0.885	VB	0.78	B	0.732	B
16	0.03	G	0.3	G	0.354	G
17	0.594	B	0.53	M	0.45	M
18	0.037	G	0.3	G	0.291	G
19	0.997	VB	0.94	VB	1	B
20	0.005	G	0.3	G	0.347	G
21	0.077	G	0.15	VG	0.414	M
22	0.002	G	0.11	VG	0.241	G
23	0.895	VB	0.94	VB	0.953	B
24	0.018	G	0.3	G	0.368	G
25	0.181	G	0.51	M	0.45	M
26	0.004	G	0.11	VG	0.072	G
27	0.045	G	0.42	M	0.371	G
28	0.006	G	0.3	G	0.225	G
29	0.015	G	0.3	G	0.241	G
30	0.2	M	0.48	M	0.45	M

Note: M: moderate; G: good; VB: very bad; B: bad; VG: very good.