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change without notice. Schweitzer Engineering Laboratories, Inc. has approved only the
English language document.
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*PDS787-02*
2350 NE Hopkins Court • Pullman, WA 99163-5603 U.S.A.
Tel: +1.509.332.1890 • Fax: +1.509.332.7990
selinc.com • info@selinc.com
SEL-787-2, -3, -4 Data Sheet
Date Code 20200331
Differential Quantities:
±5% of reading plus ±0.1 A (5 A
nominal), ±0.02 A (1 A nominal)
Current Harmonics:
±5% of reading plus ±0.1 A (5 A
nominal), ±0.02 A (1 A nominal)
I1 Positive-Sequence
Current:
±2% of reading
IG (Residual Current):
±2% of reading, ±2° (±5.0° at 0.2–0.5 A
for relays with I
NOM
= 1 A)
IN (Neutral Current):
±1% of reading, ±1° (±2.5° at 0.2–0.5 A
for relays with I
NOM
= 1 A)
3I2 Negative-Sequence
Current:
±2% of reading
System Frequency:
±0.01 Hz of reading for frequencies
within 15–70 Hz (requires ac voltage
inputs, V1 > 60 V)
Line-to-Line Voltages:
±1% of reading, ±1° for voltages
within 24–264 V
Line-to-Ground Voltages:
±1% of reading, ±1° for voltages
within 24–264 V
Voltage Harmonics:
±5% of reading plus ±0.5 V
V1 Positive-Sequence
Voltage:
±2% of reading for voltages
within 24–264 V
3V2 Negative-Sequence
Voltage:
±2% of reading for voltages
within 24–264 V
Real Three-Phase
Power (kW):
±3% of reading for 0.10 < pf < 1.00
Reactive Three-Phase
Power (kVAR):
±3% of reading for 0.00 < pf < 0.90
Apparent Three-Phase
Power (kVA):
±3% of reading
Power Factor:
±2% of reading for 0.86
pf
1
RTD Temperatures:
±2°C
Synchrophasor Accuracy
Maximum Message Rate
Nominal 60 Hz System:
60 messages per second
Nominal 50 Hz System:
50 messages per second
The following are the accuracy specifications for voltages and
currents for the SEL-787-3E and SEL-787-3S models. Note that
the SEL-787-4X model does not track frequency, so the accuracy
specifications 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°
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°
Out-of-Band Interfering
Frequency (Fs):
10 Hz
Fs
(2 • FNOM)