1.12
SEL-751A Relay Instruction Manual Date Code 20100129
Introduction and Specifications
Models, Options, and Accessories
➢ Power Factor (55)
➢ Loss of Potential (60LOP)
➤ Rate-of-Change of Frequency (81R)
➤ Arc-Flash Protection
➤ Demand and Peak Demand Metering
➤ Synchronism Check (25)
➢ Synchronism Check Undervoltage (27S)
➢ Synchronism Check Overvoltage (59S)
➤ Station DC Battery Monitor
➤ RTD-Based Protection: As many as ten (10) RTDs may be
monitored when an internal RTD card is used, or as many as
twelve (12) when an external SEL-2600 RTD Module is used.
There are separate Trip and Warn settings for each RTD.
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
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, DNP3 serial, DNP3
LAN/WAN, Ethernet FTP, Telnet, M
IRRORED BITS
®
, IEC
61850, DeviceNet, File Transfer Protocols, and
Synchrophasors with C37.118 Protocol
➤ SEL ASCII, Compressed ASCII, Fast Meter, Fast Operate, Fast
SER, and Fast Message Protocols
➤ Programmable Boolean and math operators, logic functions,
and analog compare
Models, Options, and Accessories
Models
Complete ordering information is not provided in this instruction manual. See
the latest SEL-751A Model Option Table at www.selinc.com, under SEL
Literature, Ordering Information (Model Option Tables). Options and
accessories are listed below.
SEL-751A Base Unit
➤ Front panel with large LCD display
➢ Four programmable pushbuttons with eight LEDs
➢ Eight target LEDs (six programmable)
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