Investigations on Incipient Fault Diagnosis of Power Transformer Using Neural Networks and Adaptive Neurofuzzy Inference System

Table 2

Fault diagnosis based on Rogers ratio codes.

i	j	k	l	Diagnosis
0	0	0	0	Normal deterioration
5	0	0	0	Partial discharge
1-2	0	0	0	Slight overheating <150°C
1-2	1	0	0	Overheating 150°–200°C
0	1	0	0	Overheating 200°–300°C
0	0	1	0	General conductor overheating
1	0	1	0	Winding circulating currents
1	0	2	0	Core and tank circulating currents, overhead joints
0	0	0	1	Flashover without power following through
0	0	1-2	1-2	Arc with power following through
0	0	2	2	Continuous sparking to floating potential
5	0	0	1-2	Partial discharge with tracking