New Method for OC Relay Coordination

Table 3

Relays operation time for feeders 1 and 6 fault, for the proposed method.

Relay	Bus section CB OFF		Relay	Bus section CB ON
	TMS	Operation time t (sec) for F1 fault		TMS	Operation time t (sec) for F6 fault
F1 R	0.05	0.113	F1 R	0.05	∞
F6 R	0.05	∞	F6 R	0.05	0.113
BS R	0.14	∞	BS R	0.14	0.317
INC1 R “group B”	0.14	0.317	INC1 R “group A”	0.23	0.521