4.3
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Application Data
Front-Panel Settings (SET F Command). Lists the settings for the front-panel
display, pushbuttons, and LED control.
Report Settings (SET R Command). Lists the settings for the sequential
event reports, event, and load profile reports.
DNP Map Settings (Set DNP n Command, n = 1, 2, or 3). Shows the DNP user
map register settings.
Modbus Map Settings (SET M Command). Shows the Modbus user map
register settings.
See Section 6: Settings for a list of all settings (SEL-751 Settings Sheets) and
various methods of accessing them. All current and voltage settings in the
SEL-751 are in secondary.
NOTE: The DeviceNet port
parameters can only be set at the rear
of the relay on the DeviceNet card
(see Figure H.1).
You can enter the settings by using the front-panel SET RELAY function (see
Section 8: Front-Panel Operations), the serial port (see Section 7: Communi-
cations), the EIA-485 port (see Appendix E: Modbus RTU Communications),
or the Ethernet port (see Section 7: Communications).
Application Data
It is faster and easier for you to calculate settings for the SEL-751 if you col-
lect the following information before you begin:
➤ System phase rotation and nominal frequency
➤ Current transformer primary and secondary ratings and
connections
➤ Voltage transformer or low-energy analog (LEA) voltage
sensor ratios and connections, if used
➤ Type and location of resistance temperature devices (RTDs), if
used
➤ Highest expected load current
➤ Expected fault current magnitudes for ground and three-phase
faults
Group Settings (SET Command)
ID Settings
All models of the SEL-751 have the identifier settings described in Tab le 4.1.
The SEL-751 prints the Relay and Terminal Identifier strings at the top of the
responses to serial port commands to identify messages from individual relays.
Table 4.1 Identifier Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Default
UNIT ID LINE 1 16 Characters RID := SEL-751
UNIT ID LINE 2 16 Characters TID := FEEDER RELAY
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