1.4
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Features
The SEL-751 offers three front-panel HMI layouts that are model and option
dependent. Table 1.4 lists the HMI options for the SEL-751 front panel.
Monitoring Features
➤ Event summaries that contain relay ID, date and time, trip
cause, and current/voltage magnitudes
➤ Event reports including filtered and raw analog data
➤ Sequential Events Record (SER)
➤ Compatibility with SEL-3010 Event Messenger
➤ A complete suite of accurate metering functions
➤ Breaker Wear Monitoring
➤ Load Profile Report
➤ High-Impedance Fault (HIF) Compressed Event Report
(option)
Communications and
Control
➤ EIA-232, front-panel port
➤ EIA-232, EIA-485, single or dual, copper or fiber-optic
Ethernet, and fiber-optic rear-panel EIA-232 ports
➤ IRIG-B time-code input
➤ Modbus RTU slave, Modbus TCP/IP, Simple Network Time
Protocol (SNTP), DNP3 serial, DNP3 LAN/WAN, Ethernet
FTP, Telnet, M
IRRORED BITS, Event Messenger, IEC 61850
Edition 2, IEC 60870-5-103, DeviceNet, File Transfer
Protocols, and Synchrophasors with C37.118 Protocol
HIF AST High-Impedance Fault Detection
With Arc Sense Technology
X
c
X
c
AFT Arc-Flash Detection X
c
X
c
X
c
a
Available when ordered with the directional option. The 1 A/5 A neutral channel is suitable for solidly grounded systems and also
impedance-grounded systems, depending on the available fault current level.
b
Available when ordered with the directional option. The 200 mA neutral channel is suitable for ungrounded, low-impedance grounded,
high-impedance grounded, and Petersen coil grounded applications.
c
Available as ordering options.
Table 1.3 SEL-751 Protection Elements (Sheet 3 of 3)
Protection Element
Slot Z 4 ACI/3 AVI
Card With 1 A or 5 A
Neutral Channel
Slot Z 4 ACI/3 AVI
Card With 200 mA
Neutral Channel
Slot Z 4 ACI Card
(Current Only Model)
With 1 A or 5 A
Neutral Channel
Table 1.4 SEL-751 Front-Panel Options
Model/Display Description
Front-Panel Option
(MOT String Digit
Number 16)
Number of
Pushbuttons
LED Type
SEL-751
a
With Two-Line Display
(2 x 16 characters)
0 8 Tricolor
SEL-751
a
With Two-Line Display
(2 x 16 characters)
1 4 Tricolor
SEL-751
b
With Touchscreen Display
(5-inch, color, 800 x 480 pixels)
A 8 Tricolor
a
For ordering options, refer to the SEL-751 two-line display MOT.
b
For ordering options, refer to the SEL-751 touchscreen display MOT.
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