SEL-787-2, -3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
36
Frequency and Phase Rotation
System Frequency: 50, 60 Hz
Phase Rotation: ABC, ACB
Frequency Tracking: 15–70 Hz (requires ac voltage inputs)
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
SNTP Accuracy: ±2 ms
PTP Accuracy: ±1 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
Fiber Type: Multimode
Link Budget: 16.1 dB
Typical TX Power: –15.7 dBm
RX Min. Sensitivity: –31.8 dBm
Fiber Size: 62.5/125 µm
Approximate Range: ~6.4 km
Data Rate: 100 Mbps
Typical Fiber Attenuation: –2 dB/km
PORT 2 Serial (SEL-2812 Compatible)
Wavelength: 820 nm
Optical Connector Type: ST
Fiber Type: Multimode
Link Budget: 8 dB
Typical TX Power: –16 dBm
RX Min. Sensitivity: –24 dBm
Fiber Size: 62.5/125 µm
Approximate Range: ~1 km
Data Rate: 5 Mbps
Typical Fiber Attenuation: –4 dB/km
Optional Communications Cards
Option 1: EIA-232 or EIA-485 communications
card
Option 2: DeviceNet communications card
Communications Protocols
SEL, Modbus RTU and TCP/IP, DNP3 serial and LAN/WAN, FTP,
Telnet, SNTP, IEEE 1588-2008 firmware-based PTP, IEC 61850
Edition 2, IEC 60870-5-103, EtherNet/IP, PRP, MIRRORED BITS
Communications, EVMSG, IEEE C37.118 (synchrophasors), and
DeviceNet
Operating Temperature
IEC Performance Rating: –40 to +85C (–40 to +185F)
(per IEC/EN 60068-2-1 and 60068-2-2)
Note: Not applicable to UL applications.
Note: The front-panel display is impaired for temperatures below
–20°C and above +70°C.
DeviceNet
Communications
Card Rating: +60°C (140°F) maximum
Optoisolated Control
Inputs:
As many as 26 inputs are allowed in
ambient temperatures of 85°C or less.
As many as 34 inputs are allowed in
ambient temperatures of 75°C or less.
As many as 44 inputs are allowed in
ambient temperatures of 65°C or less.
Operating Environment
Insulation Class: I
Pollution Degree: 2
Overvoltage Category: II
Atmospheric Pressure: 80–110 kPa
Relative Humidity: 5%–95%, noncondensing
Maximum Altitude Without
Derating (Consult the
Factory for Higher
Altitude Rating): 2000 m
Dimensions
144.0 mm (5.67 in) x 192.0 mm (7.56 in) x 147.4 mm (5.80 in)
Weight
2.7 kg (6.0 lb)
Relay Mounting Screws (#8–32) Tightening Torque
Minimum: 1.4 Nm (12 in-lb)
Maximum: 1.7 Nm (15 in-lb)
Terminal Connections
Termin al Blo ck
Screw Size:
#6
Ring Terminal Width:
0.310 in maximum
Terminal Block Tightening Torque
Minimum:
0.9 Nm (8 in-lb)
Maximum:
1.4 Nm (12 in-lb)
Compression Plug Tightening Torque
Minimum:
0.5 Nm (4.4 in-lb)
Maximum:
1.0 Nm (8.8 in-lb)
Compression Plug Mounting Ear Screw Tightening Torque
Minimum:
0.18 Nm (1.6 in-lb)
Maximum:
0.25 Nm (2.2 in-lb)
Product Standards
Electromagnetic
Compatibility:
IEC 60255-26:2013
IEC 60255-27:2013
UL 508
CSA C22.2 No. 14-05
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