Schweitzer Engineering Laboratories SEL-421-4 - Page 50

1.20
SEL-421 Relay Instruction Manual Date Code 20171021
Introduction and Specifications
Specifications
Metering Accuracy
All metering accuracy is at 20°C, and nominal frequency unless
otherwise noted.
Currents
Phase Current Magnitude
5 A Model: ±0.2% plus ±4 mA (2.5–15 A sec)
1 A Model: ±0.2% plus ±0.8 mA (0.5–3.0 A sec)
Phase Current Angle
All Models: ±0.2° in the current range 0.5 • I
NOM
to
3.0 • I
NOM
Sequence Current Magnitude
5 A Model: ±0.3% plus ± 4 mA (2.5–15 A sec)
1 A Model: ±0.3% plus ± 0.8 mA (0.5–3 A sec)
Sequence Current Angle
All Models: ±0.3° in the current range 0.5 • I
NOM
to
3.0 • I
NOM
Voltages
Phase and Phase-to-Phase
Voltage Magnitude: ±0.1% (33.5–300 V
L–N
)
Phase and Phase-to-Phase
Angle: ±0.5° (33.5–300 V
L–N
)
Sequence Voltage
Magnitude: ±0.1% (33.5–300 V
L-N
)
Sequence Voltage Angle: ±0.5° (33.5–300 V
L-N
)
Frequency (Input 40–65 Hz)
Accuracy: ± 0.01 Hz
Power
MW (P), Per Phase (Wye), 3 (Wye or Delta) Per Terminal
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (3)
MVAr (Q), Per Phase (Wye), 3 (Wye or Delta) Per Terminal
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 0, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 0, 0.5 lead, lag (3)
MVA (S), Per Phase (Wye), 3 (Wye or Delta) Per Terminal
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (3)
PF, Per Phase (Wye), 3 (Wye or Delta) Per Terminal
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (3)
Energy
MWh (P), Per Phase (Wye), 3 (Wye or Delta)
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 1, 0.5 lead, lag (3)
MVARh (Q), Per Phase (Wye), 3 (Wye or Delta)
±1% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 0, 0.5 lead, lag (1)
±0.7% (0.1–1.2) • I
NOM
, 33.5–300 Vac, PF = 0, 0.5 lead, lag (3)
Synchrophasor
Number of Synchrophasor
Data Streams: 5
Number of Synchrophasors for Each Stream:
15 Phase Synchrophasors (6 Voltage and 9 Currents)
5 Positive-Sequence Synchrophasors (2 Voltage and 3 Currents)
Number of User Analogs
for Each Stream: 16 (any analog quantity)
Number of User Digitals
for Each Stream: 64 (any analog quantity)
Synchrophasor Protocol: IEEE C37.118,
SEL Fast Message (Legacy)
Synchrophasor Data Rate: as many as 60 messages per second
Synchrophasor Accuracy
Voltage Accuracy: ±1% Total Vector Error (TVE)
Range 30–150 V, f
NOM
±5 Hz
Current Accuracy: ±1% Total Vector Error (TVE)
Range (0.1–2.0) • I
NOM
A, f
NOM
±5 Hz
Synchrophasor Data
Recording:
Records as much as 120 s
IEEE C37.232 File Naming Convention