1.10
SEL-787 Relay Instruction Manual Date Code 20081022
Introduction and Specifications
Specifications
Compression Plug Tightening Torque
Minimum:
0.5 Nm (4.4 in-lb)
Maximum:
1.0 Nm (8.8 in-lb)
Type Tests
Environmental Tests
Enclosure Protection: IEC 60529:2001
IP65 enclosed in panel
IP20 for terminals
Vibration Resistance: IEC 60068-2-6:1995
3 G, 10–150 Hz
IEC 60255-21-1:1988, Class 1
IEC 60255-21-3:1993, Class 2
Shock Resistance: IEC 60255-21-2:1988, Class 1
Cold: IEC 60068-2-1:1990
–40°C, 16 hours
Damp Heat, Steady State: IEC 60068-2-78:2001
40°C, 93% relative humidity, 4 days
Damp Heat, Cyclic: IEC 60068-2-30:1980
25–55°C, 6 cycles, 95% relative
humidity
Dry Heat: IEC 60068-2-2:1993
85°C, 16 hours
Dielectric Strength and Impulse Tests
Dielectric (HiPot): IEC 60255-5:2000
IEEE C37.90-1989
2.5 kVac on current inputs
2.0 kVac on ac voltage inputs,
contact I/O
1.0 kVac on analog output
2.83 kVdc on power supply
Impulse: IEC 60255-5:2000
0.5 J, 4.7 kV on power supply, contact
I/O, ac current and voltage inputs
0.5 J, 530 V on analog output
RFI and Interference Tests
EMC Immunity
Electrostatic Discharge
Immunity:
IEC 61000-4-2:2001
Severity Level 4
8 kV contact discharge
15 kV air discharge
Radiated RF Immunity: IEC 61000-4-3:2002, 10 V/m
IEEE C37.90.2-1995, 35 V/m
Fast Transient, Burst
Immunity:
IEC 61000-4-4:2001
4 kV @ 2.5 kHz
2 kV @ 5.0 kHz for comm. ports
Surge Immunity: IEC 61000-4-5:2001
2 kV line-to-line
4 kV line-to-earth
Surge Withstand
Capability Immunity:
IEC 60255-22-1:1988
2.5 kV common mode
2.5 kV differential mode
1 kV common mode on comm. ports
IEEE C37.90.1-2002
2.5 kV oscillatory
4 kV fast transient
Conducted RF Immunity: IEC 61000-4-6:2003, 10 Vrms
Magnetic Field Immunity: IEC 61000-4-8:2001
1000 A/m for 3 seconds
100 A/m for 1 minute
EMC Emissions
Conducted Emissions: EN 55011:1998, Class A
Radiated Emissions: EN 55011:1998, Class A
Electromagnetic Compatibility
Product Specific: EN 50263:1999
Certifications
ISO: Relay is designed and manufactured using
ISO 9001:2000 certified quality
program.
CE: CE Mark–EMC Directive
Low Voltage Directive
EN 61010-1:2001
EN 60947-1
EN 60947-4-1
EN 60947-5-1
Processing Specifications
AC Voltage and
Current Inputs: 16 samples per power system cycle
Frequency Tracking
Range:
20–70 Hz (requires ac voltage inputs
option)
Digital Filtering: One-cycle cosine after low-pass analog
filtering. Net filtering (analog plus
digital) rejects dc and all harmonics
greater than the fundamental.
Protection and
Control Processing:
4 times per power system cycle
(except for math variables and analog
quantities (Appendix K: Analog
Quantities), which are processed every
100 ms and 500 ms, respectively). The
51 elements are processed 2 times per
power system cycle.
Relay Elements
Instantaneous/Definite-Time Overcurrent (50P, 50G, 50N, 50Q)
Pickup Setting Range, A secondary:
5 A models: 0.50–96.00 A, 0.01 A steps
1 A models: 0.10–19.20 A, 0.01 A steps
Accuracy: ±5% of setting ± 0.02 • I
NOM
A secondary
(Steady State pickup)
Time Delay: 0.00–5.00 seconds, 0.01 seconds steps,
±0.5% ±0.25 cyc
Pickup/Dropout Time: <1.5 cyc
Inverse Time Overcurrent (51P, 51G, 51N, 51Q)
Pickup Setting Range, A secondary:
5 A models: 0.50–16.00 A, 0.01 A steps
1 A models: 0.10–3.20 A, 0.01 A steps
Accuracy: ±5% of setting ± 0.02 • I
NOM
A secondary
(Steady State pickup)
Curve: U1 = U.S. Moderately Inverse
U2 = U.S. Inverse
U3 = U.S. Very Inverse
U4 = U.S. Extremely Inverse
U5 = U.S. Short-Time Inverse
C1 = IEC Class A (Standard Inverse)
C2 = IEC Class B (Very Inverse)
C3 = IEC Class C (Extremely Inverse)
C4 = IEC Long-Time Inverse
C5 = IEC Short-Time Inverse
Time Dial:
US: 0.50–15.00, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Accuracy: ±1.5 cycles, ±4% between 2 and 30
multiples of pickup (within rated range
of current)
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