Sel SEL-787 - Page 39

1.13
Date Code 20150130 Instruction Manual SEL-787 Relay
Introduction and Specifications
Specifications
Negative-Sequence Overvoltage (59Q)
Setting Range: 12.5–200.0 V
Accuracy: ±5% of setting plus ±2 V
Pickup/Dropout Time: <1.5 cycle
Time Delay: 0.0–120.0 seconds, 0.1 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Volts/Hertz (24)
Definite-Time Element
Pickup Range: 100–200%
Steady-State Pickup
Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Time-Delay Range: 0.00–400.00 s
Time-Delay Accuracy: ±0.1% plus ±4.2 ms @ 60 Hz
Reset Time Range: 0.00–400.00 s
Inverse-Time Element
Pickup Range: 100–200%
Steady-State Pickup
Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Curve: 0.5, 1.0, or 2.0
Factor: 0.1–10.0 s
Timing Accuracy: ±4% plus ±25 ms @ 60 Hz, for V/Hz
above 1.05 multiples (Curve 0.5 and
1.0) or 1.10 multiples (Curve 2.0) of
pickup setting, and for operating times
>4 s
Reset Time Range: 0.00–400.00 s
Composite-Time Element
Combination of definite-time and inverse-time specifications
User-Definable Curve Element
Pickup Range: 100–200%
Steady-State Pickup
Accuracy: ±1% of setpoint
Pickup Time: 25 ms @ 60 Hz (Max)
Reset Time Range: 0.00–400.00 s
Directional Power (32)
Instantaneous/Definite Time, 3 Phase Elements
Type: +W, –W, +VAR, –VAR
Pickup Settings Range, VA secondary:
5 A Model: 1.0–6500.0 VA, 0.1 VA steps
1 A Model: 0.2–1300.0 VA, 0.1 VA steps
Accuracy: ±0.10 A • (L-L voltage secondary) and
±5% of setting at unity power factor for
power elements and zero power factor
for reactive power element (5 A
nominal)
±0.02 A • (L-L voltage secondary) and
±5% of setting at unity power factor for
power elements and zero power factor
for reactive power element (1 A
nominal)
Pickup/Dropout Time: <10 cycles
Time Delay: 0.0–240.0 seconds, 0.1 second steps
Accuracy: ±0.5% plus ±0.25 cycle
Frequency (81) (requires ac voltage option)
Setting Range: Off, 20.0–70.0 Hz
Accuracy: ±0.01 Hz (V1 > 60 V) with voltage
tracking
Pickup/Dropout Time: <4 cycles
Time Delay: 0.0–240.0 seconds, 0.1 second steps
Accuracy: ±0.5% plus ±0.25 cycle
RTD Protection
Setting Range: Off, 1–250°C
Accuracy: ±2C
RTD Open-Circuit
Detection: >250°C
RTD Short-Circuit
Detection: <–50°C
RTD Types: PT100, NI100, NI120, CU10
RTD Lead Resistance: 25 ohm max. per lead
Update Rate: <3 s
Noise Immunity on RTD
Inputs:
To 1.4 Vac (peak) at 50 Hz or greater
frequency
RTD Trip/Alarm Time
Delay: Approx. 6 s
Metering Accuracy
Accuracies are specified at 20C, nominal frequency, ac currents within
(0.2–20.0) • 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 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)
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: ±0.01 Hz of reading for frequencies within
20.00–70.00 Hz (V1 > 60 V) with
voltage tracking
Line-to-Line Voltages: ±1% of reading, ±1° for voltages
within 24–264 V
3-Phase Average Line-to-
Line Voltage:
±1% of reading for voltages
within 24–264 V
Line-to-Ground Voltages: ±1% of reading, ±1° for voltages
within 24–264 V
3-Phase Average Line-to-
Ground Voltages:
±1% of reading for voltages
within 24–264 V
Voltage Harmonics: ±5% of reading plus ±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