1.2
SEL-787 Relay Instruction Manual Date Code 20150130
Introduction and Specifications
Models, Options, and Accessories
➤ Neutral Current-Based Protection
➢ Neutral Instantaneous Overcurrent (50N)
➢ Neutral Time Overcurrent (51N)
➢ Restricted Earth Fault (REF)
➤ 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 with the
ST
®
option (SEL-2812 compatible) 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
➤ Transformer Through-Fault Event Monitor
➤ A complete suite of accurate metering functions
Communications and
Control
➤ EIA-232, front-panel port
➤ EIA-232, EIA-485, Ethernet (single/dual copper or fiber-optic),
and SEL-2812 compatible ST fiber-optic rear-panel port
➤ IRIG-B time-code input
➤ Modbus
®
RTU slave, Modbus TCP/IP, DNP3 serial or LAN/
WAN, Ethernet
®
FTP, Telnet, SNTP, MIRRORED BITS
®
, IEC
61850, DeviceNet
TM
, File Transfer Protocols, and
Synchrophasors with C37.118 Protocol
➤ SEL ASCII, Compressed ASCII, Fast Meter, Fast Operate, Fast
SER, Fast Message Protocols, and Event Messenger Protocol
➤ 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-787 Model Option Table at www.selinc.com, under SEL
Literature, Ordering Information (Model Option Tables). Options and
accessories are listed below.
SEL-787 Base Unit
➤ Front panel with large LCD display
➢ 4 programmable [buttons with 8 LEDs
➢ 8 target LEDs (6 programmable)
➢ Operator control interface
➢ EIA-232 port
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