Operational Risk Assessment of Distribution Network Equipment Based on Rough Set and D-S Evidence Theory

Table 8

Fault diagnosis using Rogers ratio method.

CH4/H2	C2H6/CH4	C2H4/C2H6	C2H2/C2H4	Diagnosis
0	0	0	0	Normal aging
3	0	0	0	Partial discharge (corona)
1~2	0	0	0	Overheating (≤150°C)
1~2	1	0	0	Overheating (150°C~200°C)
0	1	0	0	Overheating (200°C~300°C)
0	0	1	0	Metal superheating
1	0	1	0	Circular current in coil
1	0	2	0	Circular current in iron core and shell or joint overload
0	0	0	1	Arc discharge-no perfoliate discharge
0	0	1~2	1	Arc discharge-perfoliate discharge
0	0	2	2	Continuous discharge breakdowns
3	0	0	1~2	Partial discharge-corona (sign of creepage)