Optimal Protection Coordination for Microgrid under Different Operating Modes

Table 2

Fault currents of bolted three-phase faults in utility-only mode and in grid-connected mode.

Location of fault	Relay		Fault current (A); (utility-only mode)		Fault current (A); (grid-connected mode)
	Primary	Backup	Primary	Backup	Primary	Backup
F1	FCB2	Main CB1	11,687	11,687	12,104	12,048
F2	FCB3	Main CB1	11,687	11,687	12,123	12,086
F3	LCB4	FCB2	7,608	7,603	7,321	7,305
F4	LCB5	FCB2	5,612	5,588	5,593	5,300
F5	LCB6	FCB2	4,446	4,399	3,886	4,231
F6	LCB7	FCB3	7,608	7,603	7,228	7,016
F7	LCB8	FCB3	5,612	5,588	5,298	5,075
F8	LCB9	FCB3	4,446	4,399	4,208	3,938
F9	CB10	LCB4	5,672	5,668	4,737	4,731
F10	CB11	LCB5	4,483	4,480	3,881	3,882
F11	CB12	LCB7	5,672	5,668	4,826	4,823
F12	CB13	LCB8	4,483	4,480	3,706	3,706