2.6
SEL-751 Relay Instruction Manual Date Code 20170927
Installation
I/O Configuration
Select either EIA-232 or EIA-485 functionality through use of the Port 4
Setting COMM Interface. Table 2.3 shows the port number, interface, and type
of connector for the two protocols.
The communications card supports all of the following protocols:
➤ Modbus RTU Slave
➤ SEL ASCII and Compressed ASCII
➤ SEL Fast Meter
➤ SEL Fast Operate
➤ SEL Fast SER
➤ SEL Fast Message Unsolicited Write
➤ SEL Settings File Transfer
➤ SEL MIRRORED BITS (MBA, MBB, MB8A, MB8B, MBTA,
MBTB)
➤ Event Messenger
➤ DNP3 Level 2 Outstation
➤ C37.118 (Synchrophasor Data)
➤ IEC 60870-5-103
Current/Voltage Card
(4 ACI/3 AVI)
MOT…x81x…(1 A phase, 1 A neutral CTs), or …x85x…(5 A phase,
5 A neutral CTs), or …x82x…(1 A phase, 5 A neutral CTs), or …x86x…
(5 A phase, 1 A neutral CTs) or …x83x…(1 A phase, 200 mA neutral CTs),
or …x87x…(5 A phase, 200 mA neutral CTs). Supported in Slot Z of the
SEL-751, this card has current inputs for three-phase CTs, neutral current
CTs, and 300 Vac voltage inputs for three-phase (wye or delta) PTs.
MOT…xL1x…(1 A phase, 1 A neutral CTs), or …xL5x…(5 A phase, 5 A
neutral CTs), or …xL2x…(1 A phase, 5 A neutral CTs), or …xL6x… (5 A
phase, 1 A neutral CTs) or …xL3x… (1 A phase, 200 mA neutral CTs), or
…xL7x…(5 A phase, 200 mA neutral CTs). Supported in Slot Z of the
SEL-751, this card has current inputs for three-phase CTs, neutral current
CTs, and 8 Vac LEA voltage inputs for three-phase (wye or delta) PTs.
The 4 ACI/3 AVI current/voltage card inputs terminal designation for the card
with LEA voltage inputs and the regular voltage inputs is as shown in
Table 2.4.
Table 2.3 Communications Card Interfaces and Connectors
Port Interface Connectors
4A EIA-485 5-pin Euro
4C EIA-232 D-sub
Before working on a CT circuit, first
apply a short to the secondary
winding of the CT.
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