U.1.14
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Introduction and Specifications
Specifications
Timer Specifications
Setting Ranges
Breaker Failure: 0–6000 cycles, 0.125 cycle steps
(All but BFIDOn, BFISPn)
0–1000 cycles, 0.125 cycle steps
(BFIDOn, BFISPn)
Communications-
Assisted Tripping
Schemes: 0.000–16000 cycles, 0.125 cycle steps
Out-of-Step Timers:
OSBD, OSTD: 0.500–8000 cycles, 0.125 cycle steps
UBD: 0.500–120 cycles, 0.125 cycle steps
Pole Open Timer: 0.000–60 cycles, 0.125 cycle steps
Recloser: 1–99999 cycles, 1 cycle steps
Switch-Onto-Fault:
CLOEND,
52AEND: OFF, 0.000–16000 cycles,
0.125 cycle steps
SOTFD: 0.50–16000 cycles, 0.125 cycle steps
Synchronism
Check Timers:
TCLSBK1,
TCLSBK2: 1.00–30.00 cycles, 0.25 cycle steps
Zone Time Delay: 0.000–16000 cycles, 0.125 cycle steps
Station DC Battery System Monitor Specifications
Operating Range: 0–350 Vdc
Input Sampling Rate: 2 kHz
Processing Rate: 1/8 cycle
Maximum
Operating Time: £ 1.5 cycles
Setting Range:
DC settings: 15–300 Vdc, 1 Vdc steps
AC ripple setting: 1–300 Vac, 1 Vac steps
Accuracy:
Pickup Accuracy: ±3% plus ±2 Vdc
(all elements but DC1RP and DC2RP)
±10% plus ±2 Vac (DC1RP and DC2RP)
Metering Accuracy
All metering accuracy is at 0.1 • I
nom
, 20°C, and nominal frequency
unless otherwise noted.
Currents
Phase Current Magnitude
5 A Model Input ³ 0.5 A: ±0.2% plus ±4 mA
1 A Model Input ³ 0.1 A:
±0.2% plus ±0.8 mA
Phase Current Angle: ±0.2°
Sequence Currents Magnitude
5 A Model Input > 0.5 A: ±0.3% plus ±4 mA
1 A Model Input ³ 0.1 A:
±0.3% plus ±0.8 mA
Sequence Current Angle: ±0.3 degree
Voltages
Phase and Phase-to-Phase Voltage Magnitude:
Input > 33.5 volts: ±0.1%
Phase and
Phase-to-Phase Angle: ±0.05 degree
Sequence Voltage Magnitude:
Input > 33.5 volts: ±0.15%
Sequence Voltage Angle: ±0.1 degree
Frequency (Input 40–65 Hz)
Accuracy: ±0.01 Hz
Power and Energy
Real Power, P (MW), Three Phase
At 0.1 • I
nom
Power factor unity ±0.4%
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%
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%
Synchronized Phasor Measurements*
Sampling Rate: 20 sps
Vo l t a g e
Magnitude Accuracy: ±0.1%
Voltage Angle Accuracy: ±0.125°
Voltage Range: 30–150 V
* Synchrophasor capability is not available in the SEL-421-1 Relay.
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