1.15
Date Code 20170927 Instruction Manual SEL-751 Relay
Introduction and Specifications
Specifications
Analog Output (Optional)
1 A0 4 A0
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)
Arc-Flash Detectors (Optional)
Multimode fiber-optic receiver/transmitter pair
Fiber Type: 1000 µm diameter, 640 nm wavelength,
plastic, clear-jacketed, or black-
jacketed
Connector Type: V-Pin
Frequency and Phase Rotation
System Frequency: 50, 60 Hz
Phase Rotation: ABC, ACB
Frequency Tracking: 15–70 Hz
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: 2 minutes per year typical
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: Rear 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
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
Channels 1-8 Arc-Flash Detectors (AFDI)
Diagnostic Wavelength: 640 nm
Optical Connector Type: V-Pin
Fiber Type: Multimode
Typical TX Power: –12 dBm
Point Sensor
Minimum Receive
Sensitivity: –52.23 dB
Point Sensor Diagnostic
Worst Case Loss: –28 dB
Link Budget: 12.23 dB
Black-Jacketed Fiber Worst
Case Loss: –0.19 dBm
Black-Jacketed Fiber Typical
Loss: –0.17 dBm
ST or V-Pin Connector Splice
Loss: –2.00 dB
Approximate Range: As much as 35 m
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