1.6
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Models, Options, and Accessories
Options
➤ Firmware options
➢ Autoreclosing control
➢ Directional control for overcurrent elements (solid or
low-impedance grounded systems only)
➢ Directional control for overcurrent elements (low-
impedance grounded systems; ungrounded, high-
impedance grounded systems; and Petersen coil-
grounded systems—requires 200 mA neutral CT)
➢ High-impedance fault (HIF) detection using Arc Sense
technology
➤ Current/Voltage input options (see Table 1 .1)
➢ AC currents only model (no voltages)
➤ 2 AVI/4 AFDI card option with
➢ Synchronism-check voltage input (300 V or 8 V LEA)
➢ DC station battery monitor
➢ 4 arc-flash detector inputs
➤ 8 AFDI card option
➢ 8 arc-flash detector inputs
➤ Input/output (I/O) options
➢ Additional digital I/O (4 DI/4 DO, 4 DI/3 DO, 8 DI,
8 DO, 3 DI/4 DO/1 AO, 14 DI)
➢ Additional analog I/O (4 AI/4 AO, 8 AI)
➢ 10 RTD inputs
➤ Front-panel HMI options (see Table 1.4)
➤ Communications options (protocol/ports)
➢ EIA-485/EIA-232/Ethernet ports (single/dual, copper
or fiber-optic)
➢ AC currents only model (no voltages) with no fiber-
optic serial port
➢ Simple Network Time Protocol (SNTP)
➢ Modbus TCP/IP
➢ DeviceNet
➢ IEC 61850 Edition 2
➢ IEC 60870-5-103
➢ DNP3 serial and LAN/WAN
➤ Language Options
➢ The relay supports English or Spanish language as an
ordering option
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