Low Computational Burden Adaptive Overcurrent Protection for Active Distribution Networks

Table 6

Operating times for the islanded condition.

DER state			Relay			Conventional			Proposed
1	2	3	F	PR	BR
0	1	1	F1	R2	R4	0.092	0.288	0.195	0.092	0.295	0.202
			F2	R6	R8	0.099	0.301	0.202	0.099	0.301	0.202
0	1	0	F1	R2	R4	0.091	0.286	0.194	0.091	0.292	0.201
			F2	R8	R6	0.100	0.298	0.198	0.100	0.302	0.202
0.5	1	0.25	F1	R2	R4	0.090	0.286	0.196	0.090	0.291	0.201
			F2	R6	R8	0.100	0.298	0.198	0.100	0.300	0.201

The times in column delta t for conventional and proposed approaches are bolded when relay misscoordination is presented for the conventional approach. In this situation, adequate relay coordination was obtained using the proposed approach.