1.20
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Specifications
Synchrophasor Accuracy
Maximum Message Rate
Nominal 60 Hz System: 60 messages per second
Nominal 50 Hz System: 50 messages per second
The voltage accuracy specifications are only applicable for the model
options with standard voltage inputs (not applicable to LEA option).
The current accuracy specifications are applicable for all 1 A and 5 A
options.
Note: For the SEL-751 current only model, the accuracy specifications
for currents are only applicable when the applied signal frequency
equals FNOM.
Accuracy for Voltages
Level 1 compliant as specified in IEEE C37.118 under the following
conditions for the specified range.
Conditions
➤ At maximum message rate
➤ When phasor has the same frequency as the positive-sequence
voltage
➤ Frequency-based phasor compensation is enabled PHCOMP := Y)
➤ The narrow bandwidth filter is selected (PMAPP := N)
Range
Frequency: ±5.0 Hz of nominal (50 or 60 Hz)
Magnitude: 30 V–250 V
Phase Angle: –179.99° to 180.00°
Out-of-Band Interfering
Frequency (Fs): 10 Hz Fs (2 • FNOM)
Accuracy for Currents
Level 1 compliant as specified in IEEE C37.118 under the following
conditions for the specified range.
Conditions
➤ At maximum message rate
➤ When phasor has the same frequency as the positive-sequence
voltage
➤ Frequency-based phasor compensation is enabled
(PHCOMP := Y)
➤ The narrow bandwidth filter is selected (PMAPP := N)
Range
Frequency: ±5.0 Hz of nominal (50 or 60 Hz)
Magnitude: (0.4–2) • I
NOM
(I
NOM
= 1 A or 5 A)
Phase Angle: –179.99° to 180.00°
Out-of-Band Interfering
Frequency (Fs): 10 Hz Fs (2 • FNOM)
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