Optimal Protection Coordination for Microgrid under Different Operating Modes

Table 3

Fault currents of bolted single line-to-ground 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	12,016	12,006	11,696	11,947
F2	FCB3	Main CB1	12,016	12,006	11,432	11,946
F3	LCB4	FCB2	7,270	7,256	6,450	6,885
F4	LCB5	FCB2	5,072	5,042	4,537	4,753
F5	LCB6	FCB2	3,854	3,826	3,389	3,697
F6	LCB7	FCB3	7,270	7,256	6,333	6,630
F7	LCB8	FCB3	5,072	5,042	4,229	4,518
F8	LCB9	FCB3	3,876	3,826	3,131	3,403
F9	CB10	LCB4	5,241	5,236	4,348	4,346
F10	CB11	LCB5	3,986	3,981	3,449	3,442
F11	CB12	LCB7	5,241	5,235	4,340	4,338
F12	CB13	LCB8	3,986	3,981	3,188	3,187