4.188
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Port Settings (SET P Command)
89A and 89B
Disconnect Switch
Status SELOGIC
Control Equations
The SEL-751 supports as many as five monitor-only, two-position discon-
nects. For the disconnect switch settings and logic, refer to Disconnect Switch
Symbol Settings and Status Logic on page 9.2. The SEL-751 Relay with the
touchscreen display option additionally provides the ability to design detailed
single-line diagrams and display the breaker and disconnect switch status.
Refer to Table 9 .3 for typical disconnect switch symbols available for display
on the bay screens. For the settings related to bay control disconnect switch
symbols, refer to Table 9.5 and the corresponding description.
Local/Remote
Breaker Control
The SEL-751 supports local/remote control of the breaker through supervision
of the OC and CC breaker control bits. For the settings related to the local/
remote control function, refer to Local/Remote Breaker Control on page 9.3.
For breaker control via front-panel pushbuttons, refer to Front-Panel Operator
Control Pushbuttons on page 8.15. For breaker control via the two-line dis-
play, refer to Control Menu on page 8.9. The touchscreen allows you to con-
trol the breaker through two applications, Bay Screens and Breaker Control.
For breaker control via the touchscreen display, refer to Breaker Control Via
the Touchscreen on page 9.5.
Port Settings (SET P Command)
The SEL-751 provides settings that allow you to configure the parameters for
the communications ports. See Section 2: Installation for a detailed descrip-
tion of port connections. On the base unit: Port F (front panel) is an EIA-232
port; Port 1 is an optional Ethernet port(s); Port 2 is an optional fiber-optic
serial port; and Port 3 (rear) is optionally an EIA-232 or EIA-485 port. On the
optional communications card, you can select Port 4 as either EIA-485 or
EIA-232 (not both) with the COMMINF setting. See Table 4.83 through
Table 4.88 for the port settings, also see appropriate Appendix for additional
information on the protocol (DNP, MODBUS, IEC-61850, DeviceNet, Syn-
chrophasors, and M
IRRORED BITS) of interest.
PORT F
Table 4.82 Time Synchronization Source Setting
Setting Prompt Setting Range
Setting Name :=
Fac to ry Defa ult
IRIG TIME SOURCE IRIG1, IRIG2 TIME_SRC := IRIG1
Table 4.83 Front-Panel Serial Port Settings (Sheet 1 of 2)
Setting Prompt Setting Range
Setting Name :=
Fac to ry De fa ult
ENABLE PORT Y, N EPORT := Y
PROTOCOL SEL, MOD, EVMSG, PMU PROTO := SEL
MAXIMUM ACCESS LEVEL 1, 2, C MAXACC := 2
SPEED 300–38400 bps SPEED := 9600
DATA BITS 7, 8 bits BITS := 8
PARITY O, E, N PARITY := N
STOP BITS 1, 2 bits STOP := 1
PORT TIME-OUT 0–30 min T_OUT := 5
HDWR HANDSHAKING Y, N RTSCTS := N
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