A Fault Diagnosis Method of Power Systems Based on Gray System Theory

Table 2

State information of protective relays and circuit breakers.

Fault nodes	The state information for protective relays and circuit break
A	= 1, CB1 = 1 and CB2 = 1 or = 1, CB2 = 0 and CB3 = 1
B	= 1, CB3 = 1 and CB4 = 1 or = 1, CB3 = 0 and CB2 = 1 or = 1, CB4 = 0 and CB5 = 1
L1	= 1 and CB2 = 1 or = 1 and CB3 = 1 or = 1, = 0, and CB2 = 1 or = 1, = 0, and CB3 = 1 or = 1, CB3 = 0, CB4 = 0, and CB5 = 1
L2	= 1 and CB4 = 1 or = 1 and CB5 = 1 or = 1, = 0, and CB4 = 1 or = 1, = 0, and CB5 = 1 or = 1, CB3 = 0, CB4 = 0, and CB2 = 1