
1.12
SEL-787 Relay
Instruction Manual
Date Code 20081022
Introduction and Specifications
Specifications
Metering Accuracy
Accuracies are specified at 20
°
C, nominal frequency, ac currents
within (0.2–2.0) • I
NOM
A secondary, and ac voltages within
50–250 V secondary unless otherwise noted.
Phase Currents:
±1% of reading, ±1° (±2.5° at 0.2–0.5 A
for relays with Inom = 1 A)
3-Phase Average Current: ±2% of reading
Differential Quantities:
±5% of reading, ±0.1 A (5 A nominal),
±0.02 A (1 A nominal)
Current Harmonics:
±5% of reading, ±0.1 A (5 A nominal),
±0.02 A (1 A nominal)
IG (Residual Current):
±3% of reading, ±2° (±5.0° at 0.2–0.5 A
for relays with Inom = 1 A)
IN (Neutral Current):
±1% of reading, ±1° (±2.5° at 0.2–0.5 A
for relays with Inom = 1 A)
3I2 Negative-Sequence
Current:
±3% of reading
System Frequency:
±0.1 Hz of reading for frequencies
within 20–70 Hz (requires ac voltage
inputs option)
Line-to-Line Voltages:
±2% of reading, ±1° for voltages
within 24–264 V
3-Phase Average Line-to-
Line Voltage:
±2% of reading for voltages
within 24–264 V
Line-to-Ground Voltages: ±2% of reading, ±1° for voltages
within 24–264 V
3-Phase Average Line-to-
Ground Voltages:
±2% of reading for voltages
within 24–264 V
Voltage Harmonics:
±5% of reading, ±0.5 V
3V2 Negative-Sequence
Voltage:
±
3% of reading for voltages
within 24–264 V
Real 3-Phase Power (kW):
±
3% of reading for 0.10 < pf < 1.00
Reactive 3-Phase
Power (kVAR):
±
3% of reading for 0.00 < pf < 0.90
Apparent 3-Phase
Power (kVA):
±
3% of reading
Power Factor:
±
2% of reading for 0.86
≤
pf
≤
1
RTD Temperatures:
±2
°
C
Содержание SEL-787
Страница 1: ...20081022 SEL 787 Transformer Protection Relay Instruction Manual PM787 01 NB ...
Страница 6: ...This page intentionally left blank ...
Страница 12: ...This page intentionally left blank ...
Страница 18: ...This page intentionally left blank ...
Страница 78: ...This page intentionally left blank ...
Страница 206: ...This page intentionally left blank ...
Страница 280: ...This page intentionally left blank ...
Страница 334: ...This page intentionally left blank ...
Страница 376: ...This page intentionally left blank ...
Страница 388: ...This page intentionally left blank ...
Страница 474: ...This page intentionally left blank ...
Страница 508: ...This page intentionally left blank ...
Страница 522: ...This page intentionally left blank ...