1.22
SEL-751A Relay Instruction Manual Date Code 20100129
Introduction and Specifications
Specifications
Multimode Fiber-Optic Port (Optional)
Laser/LED: Class 1 LED
Complies with IEC 60825-1:1993
+ A1:1997 + A2:2001
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 um
Approximate Range: ~6.4 Km
Data Rate: 100 Mb
Typical Fiber Attenuation: –2 dB/Km
Port 2 Serial
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 Mb
Typical Fiber Attenuation: –4 dB/Km
Channels 1-4 Arc-Flash Detectors (AFDI)
Wavelength: 640 nm
Optical Connector Type: V-Pin
Fiber Type: Multimode
Link Budget: 27 dB
Typical TX Power: –12 dBm
RX Min. Sensitivity: –39 dBm
Fiber Size: 1000 µm
Approximate Range: Up to 35 m (Point Sensor)
Up to 70 m (Bare–Fiber Sensor)
Data Rate: NA
Typical Fiber Attenuation: –0.15 dB/m
Optional Communications Cards
Option 1: EIA-232 or EIA-485 communications
card
Option 2: DeviceNet communications card
Communications Protocols
SEL, Modbus, DNP3, FTP, TCP/IP, Telnet, IEC 61850, MIRRORED
B
ITS Communications, EVMSG, C37.118 (synchrophasors) and
DeviceNet.
Operating Temperature
IEC Performance Rating:
(per IEC/EN 60068-2-1 &
60068-2-2) –40° to +85°C (–40° to +185° F)
UL/CSA Safety Rating: +70°C (158°F) maximum
DeviceNet Communications
Card Rating: +60°C (140°F) maximum
Operating Environment
Pollution Degree: 2
Overvoltage Category: II
Atmospheric Pressure: 80–110 kPa
Relative Humidity: 5–95%, noncondensing
Maximum Altitude: 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 lbs)
Terminal Connections
Current Inputs 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)
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
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