Interaction of Transformer Oil Parameters on Each Other and on Transformer Health Index Using Curve Estimation Regression Method

Table 4

Comparison of five regression methods to predict the relationship between oil breakdown voltage (BDV) and water components of transformer.

Equation	Model summary					Parameter estimates
	R-Square	F	df1	df2	Sig	Constant	b1
Compound	0.583	164.878	1	118	0	73.049	0.969
S	0.165	23.343	1	118	0	3.897	0.541
Growth	0.583	164.878	1	118	0	4.291	-0.031
Exponential	0.583	164.878	1	118	0	73.049	-0.031
Logistic	0.583	164.878	1	118	0	0.014	1.032

Dependent variable: BDV; independent variable: water.