1.5
Date Code 20170927 Instruction Manual SEL-751 Relay
Introduction and Specifications
Models, Options, and Accessories
➤ SEL ASCII, Compressed ASCII, Fast Meter, Fast Operate, Fast
SER, and Fast Message Protocols
➤ Programmable Boolean and math operators, logic functions,
and analog compare
Language Support
➤ The standard relay front-panel overlay is in English; a Spanish
overlay is available as an ordering option. Text displayed on the
HMI display will correspond to the ENGLISH or SPANISH
ordering option.
➤ All of the ASCII command responses can be displayed in
English or Spanish. When you set the port setting LANG to
either ENGLISH or SPANISH, the SEL-751 ASCII commands
display in the corresponding language.
Models, Options, and Accessories
Models
Complete ordering information is not provided in this instruction manual. See
the latest Model Option Table for the SEL-751 with the two-line display and
the SEL-751 with the touchscreen display at selinc.com, under Support >
Product Literature > Ordering Information (Model Option Tables). Options
and accessories are as follows:
SEL-751 Base Unit
➤ Front panel with two-line display or with touchscreen display
➢ Eight programmable pushbuttons, each with two
tricolor LEDs
➢ Eight target tricolor LEDs (six programmable)
➢ Operator control interface
➢ EIA-232 port
➤ Power supply card with two digital inputs and three digital
outputs (Slot A)
➤ Processor and communications card (Slot B)
➢ EIA-232 serial port with IRIG-B time code input
➢ Multimode (ST) fiber-optic serial port
➤ Three expansion slots for optional cards (Slots C, D, E)
➤ Four ac current inputs (1 A/5 A/200 mA neutral only)/three ac
voltage inputs (300 V or 8 V LEA) card (Slot Z)
➤ Protocols
➢ Modbus RTU
➢ SEL ASCII and Compressed ASCII
➢ SEL Fast Meter, Fast Operate, Fast SER, Fast Message
➢ Ymodem File Transfer
➢ SEL MIRRORED BITS
➢ Event Messenger
➢ Synchrophasors with C37.118
➤ Breaker Wear Monitoring
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