Schweitzer Engineering Laboratories, Inc.
SEL-787-2, -3, -4 Data Sheet
21
Automation
Flexible Control Logic and Integration Features
The SEL-787 can be ordered with as many as four inde-
pendently operated serial ports:
➤
EIA-232 port on the front panel
➤
EIA-232 or EIA-485 port on the Slot B card in the
rear
➤
EIA-232 fiber-optic port on the Slot B card in the rear
➤
EIA-232 or EIA-485 port on the optional communi-
cations card in Slot C in the rear
Optionally, the relay supports single or dual, copper or
fiber-optic Ethernet ports. The relay does not require spe-
cial communications software. You can use any system
that emulates a standard terminal system for engineering
access to the relay. Establish local or remote communica-
tion by connecting computers, modems, protocol con-
verters, printers, an SEL RTAC, SEL communications
processor, SEL computing platform, SCADA serial port,
or RTUs. Refer to
for a list of communications
protocols available in the SEL-787.
Table 6
Communications Protocols
Type
Description
Simple ASCII
Plain language commands for human and simple machine communications. Use for metering, setting, self-test
status, event reporting, and other functions.
Compressed ASCII
Comma-delimited ASCII data reports. Allows external devices to obtain relay data in an appropriate format for
direct import into spreadsheets and database programs. Data are checksum protected.
Extended Fast Meter and
Fast Operate
Binary protocol for machine-to-machine communications.
Quickly updates SEL communications processors, RTUs, and other substation devices with metering
information, relay element, I/O status, time-tags, open and close commands, and summary event reports. Data
are checksum protected. Binary and ASCII protocols operate simultaneously over the same communications
lines, so control operator metering information is not lost while a technician is transferring an event report.
Fast SER Protocol
Provides SER events to an automated data collection system.
Fast Message Protocol
Use this protocol to write remote analog data from other SEL relays or communications processors via
unsolicited writes.
DNP3
Serial or Ethernet-based DNP3 protocols.
Provides default and mappable DNP3 objects that include access to metering data, protection elements, Relay
Word bits, contact I/O, targets, SER, relay summary event reports, and setting group selection.
Modbus
Serial- or Ethernet-based Modbus protocol with point remapping. Includes access to metering data, protection
elements, contact I/O, targets, SER, relay summary event reports, and setting groups.
IEC 61850 Edition 2
Ethernet-based international standard for interoperability between intelligent devices in a substation. Operates
remote bits and I/O. Monitors Relay Word bits and analog quantities.
Synchrophasors
IEEE C37.118-2005-compliant synchrophasors for system state, response, and control capabilities.
Event Messenger
The use of SEL-3010 Event Messenger allows you to receive alerts directly on your cell phone. Alerts can be
triggered through relay events and can include quantities measured by the relay.
DeviceNet
Allows for connection to a DeviceNet network for access to metering data, protection elements, contact I/O,
targets, and setting groups.
SNTP
Ethernet-based protocol that provides time synchronization of the relay.
IEEE 1588-2008
firmware-based PTP
Ethernet-based protocol that provides time synchronization of the relay.
PRP
Provides seamless recovery from any single Ethernet network failure in a dual redundant Ethernet network, in
accordance with IEC 62439-3.
IEC 60870-5-103
Serial communications protocol–international standard for interoperability between intelligent devices in a
substation.
EtherNet/IP
Ethernet-based protocol that provides access to metering data, protection elements, targets, and contact I/O.
