Sel 421 - Page 61

U.1.19
Date Code 20090715 User’s Guide SEL-421 Relay
Introduction and Specifications
Specifications
Reactive Power, Q (MVAR), Three Phase
At 0.1 • I
nom
Power factor 0.5 lag,
0.5 lead:
±0.5%
At 1.0 • I
nom
Power factor 0.5 lag,
0.5 lead:
±0.4%
Energy (MWh), Three Phase
At 0.1 • I
nom
Power factor unity: ±0.5%
Power factor 0.5 lag,
0.5 lead:
±0.7%
At 1.0 • I
nom
Power factor unity: ±0.4%
Power factor 0.5 lag,
0.5 lead:
±0.4%
Synchrophasors
See Accuracy on page R.7.9 for test exclusions and details.
TVE (total vector error): ≤1%
Frequency Range: ±5 Hz of nominal (50 or 60 Hz)
Voltage Range: 30 V–150 V
Current Range: (0.1–2) • I
nom
(I
nom
= 1 A or 5 A)
Phase Angle Range: –179.99° to 180°
Courtesy of NationalSwitchgear.com