1.10
SEL-787 Relay Instruction Manual Date Code 20150130
Introduction and Specifications
Specifications
Fast Hybrid (High-Speed High-Current Interrupting)
Make: 30 A
Carry: 6 A continuous carry at 70°C
4 A continuous carry at 85°C
1 s Rating: 50 A
Open State Leakage Current: <100 µA
MOV Protection (maximum
voltage): 250 Vac/330 Vdc
Pickup Time: <50 s, resistive load
Dropout Time: 8 ms, resistive load
Update Rate: 1/8 cycle
Break Capacity (10000 operations):
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for
thermal dissipation):
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
NOTE: Per IEC 60255-23:1994, using the simplified method of
assessment.
NOTE: Make rating per IEEE C37.90-1989.
Optoisolated Control Inputs
When Used With DC Control Signals
250 V:
ON for 200–312.5 Vdc
OFF below 150 Vdc
220 V:
ON for 176–275 Vdc
OFF below 132 Vdc
125 V:
ON for 100–156.2 Vdc
OFF below 75 Vdc
110 V:
ON for 88–137.5 Vdc
OFF below 66 Vdc
48 V:
ON for 38.4–60 Vdc
OFF below 28.8 Vdc
24 V:
ON for 15–30 Vdc
OFF for <5 Vdc
When Used With AC Control Signals
250 V:
ON for 170.6–312.5 Vac
OFF below 106 Vac
220 V:
ON for 150.2–275 Vac
OFF below 93.3 Vac
125 V:
ON for 85–156.2 Vac
OFF below 53 Vac
110 V:
ON for 75.1–137.5 Vac
OFF below 46.6 Vac
48 V:
ON for 32.8–60 Vac
OFF below 20.3 Vac
24 V:
ON for 14–30 Vac
OFF below 5 Vac
Current draw at nominal dc
voltage:
2 mA (at 220–250 V)
4 mA (at 48–125 V)
10 mA (at 24 V)
Rated Impulse Withstand
Voltage (U
imp
): 4000 V
UL/CSA Digital Output Contact Temperature Derating for Operating at
Elevated Temperatures
Digital Output
Cards Installed
Operating
Ambient
Maximum Value
of Current (I
the
) Duty Factor
1–3 less than or
equal to 60°C
5.0 A Continuous
1–3 between 60°C
and 70°C
2.5 A Continuous
Analog Output (Optional)
1A0 4A0
Current: 4–20 mA ±20 mA
Voltage: — ±10 V
Load at 1 mA: — 0–15 k
Load at 20 mA: 0–300 0–750
Load at 10 V: — >2000
Refresh Rate: 100 ms 100 ms
% Error, Full Scale, at 25°C: <±1% <±0.55%
Select From: Analog quantities available in the relay
Analog Inputs (Optional)
Maximum Input Range: ±20 mA
±10 V
Operational range set by user
Input Impedance: 200 (current mode)
>10 k (voltage mode)
Accuracy at 25°C:
With user calibration:
0.05% of full scale (current mode)
0.025% of full scale (voltage mode)
Without user calibration: Better than 0.5% of full scale at 25°C
Accuracy Variation With
Temperature:
±0.015% per °C of full-scale
(±20 mA or ±10 V)
Frequency and Phase Rotation
System Frequency: 50, 60 Hz
Phase Rotation: ABC, ACB
Frequency Tracking: 20–70 Hz (requires ac voltage inputs
option)
Time-Code Input
Format: Demodulated IRIG-B
On (1) State: V
ih
2.2 V
Off (0) State: V
il
0.8 V
Input Impedance: 2 k
Synchronization Accuracy:
Internal Clock: ±1 µs
Synchrophasor Reports
(e.g., MET PM ): ±10 µs
All Other Reports: ±5 ms
Simple Network Time Protocol (SNTP) Accuracy
Internal Clock: ±5 ms
Unsynchronized Clock Drift
Relay Powered: 2 minutes per year, typically
Communications Ports
Standard EIA-232 (2 ports)
Location:
Front Panel
Rear Panel
Data Speed: 300–38400 bps
EIA-485 Port (optional)
Location: Rear Panel
Data Speed: 300–19200 bps
Ethernet Port (optional)
Single/Dual 10/100BASE-T copper (RJ45 connector)
Single/Dual 100BASE-FX (LC connector)
Standard Multimode Fiber-Optic Port
Location: Front Panel
Data Speed: 300–38400 bps
Fiber-Optic Ports Characteristics
Port 1 (or 1A, 1B) Ethernet
Wavelength:
1300 nm
Optical Connector Type:
LC
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