Relay Application Table

Choose the purpose of your protection scheme:
- Clear Faults
- Relieve Stress
- Restore Power
- Preserve System

Choose the relay type and the zone you would like to protect on the chart below.

Purpose	Relay Type	Protected Zone
Clear Faults		Feeders	Transmission	Bus	Transformers	Generators	Motors	Intertie
	Current	50, 51, 50/51B&M, 700C 851, 951, 1051	67, 67N, 700C, 851, 951, 1051	CDS240,CDS22 0, 700C, 851, 951, 1051	50, 51, CDS240, CDS220, 700C, 851, 951, 1051	51/27R, 51/27C, 700C, 851, 951, 1051, GPS, CDS240	51, 50/51, CDS240, CDS220, 700C, 851, 951, 1051	IPS100, 951, 1051
	Differential			CDS240, CDS220, 87B	87T, CDS240, CDS220	87G, CDS240, CDS220	87G, CDS240, CDS220
	Breaker Failure	700C, 851, 951, 1051	50BF, BPR, 951, 1051	951, 1051, CDS240	951, 1051, CDS240	700C, 851, 951, 1051, GPS, CDS240	700C, 851, 951, 1051, CDS240	IPS100, 951, 1051
	Negative Sequence	700C, 851, 951, 1051	951, 1051	CDS240, CDS220, 700C, 851, 951, 1051	CDS240, CDS220, 700C, 851, 951, 1051	46N, CDS240, CDS220, 700C, 851, 951, 1051, GPS	46N, 47N, CDS240, CDS220, 700C, 851, 951, 1051	IPS100, 951, 1051
Purpose	Relay Type	Protected Zones
		Feeders	Transmission	Bus	Transformers	Generators	Motors	Intertie
Relieve Stress	Excitation				951, 1051, CDS240	40Q, 60, GPS, CDS240	40Q, CDS240	IPS100, 951, 1051
Relieve Stress	Voltage	27/59*, 700V, 951, 1051	700V, 951, 1051	59NC, 700V, 951, 1051, CDS240	700V, 951, 1051, CDS240	27, 59, 59N, 700V, 951, 1051, GPS, CDS240	27, 27/59, 700V, 951, 1051, CDS240	IPS100, 700V, 951, 1051
Purpose	Relay Type	Protected Zones
		Feeders	Transmission	Bus	Transformers	Generators	Motors	Intertie
Restore Power	Sync	25*, 951, 1051	25, 951, 1051			25, 25A, 951, 1051, GPS
Restore Power	Multiple Shot Reclose	79A, 79M, 700C, 700V, 851, 951, 1051	79A, 79M, 700V, 951, 1051			700V		IPS100, 951, 1051
Purpose	Relay Type	Protected Zone
		Feeders	Transmission	Bus	Transformers	Generators	Motors	Intertie
Preserve System	Power	32R*, 951, 1051	951, 1051	951, 1051	951, 1051	32R, 32O/U, 951, 1051, GPS	32R, 32O/U, 951, 1051	IPS100, 951, 1051
Preserve System	Frequency	81O/U*, 700V, 951, 1051	700V, 951, 1051	700V, 951, 1051, CDS240	700V, 951, 1051, CDS240	81O/U, 700V, 951, 1051, GPS, CDS240	700V, 951, 1051, CDS240	IPS100, 700V, 951, 1051

*=The use of this relay is suggested with distributed sources of generation.

For more information:

See the BE1 Numerical Relay Functions page
Download a reference sheet to the protective relay ANSI Device numbers