Schweitzer Engineering Laboratories SEL-751 - Page 128

4.2
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Overview
Frequency Protection. Lists the settings associated with over/under
frequency, rate-of-change-of-frequency and fast rate-of-change-of-
frequency.
Trip/Close Logic. Lists Trip and Close logic.
Reclose Supervision Logic. Describes the logic that supervises automatic
reclosing when an open interval time times out—a final condition
check right before the close logic asserts the close output contact.
Reclose Logic. Describes all the reclosing relay settings and logic
necessary for automatic reclosing (besides the final close logic and
reclose supervision logic described previously).
Demand Metering. Lists the settings associated with demand metering.
Logic Settings (SET L Command). Lists the settings associated with latches,
timers, and output contacts.
Global Settings (SET G Command). Lists the settings that allow you to
configure the relay to your power system, date format, analog inputs/
outputs, and logic equations of global nature.
Synchrophasor Measurement. Describes Phasor Measurement Unit
(PMU) settings for C37.118 Protocol.
Breaker Failure Setting. Lists the settings and describes the logic for the
flexible breaker failure function.
Arc-Flash Protection. Lists the settings for the arc-flash elements
including arc-flash overcurrent and time-overlight
elements.
Analog Inputs. Describes analog input functionality, lists the settings and
gives an example.
Analog Outputs. Describes analog output functionality, lists the settings
and gives an example.
Station DC Battery Monitor. Describes station dc battery monitor function
and lists the settings.
Breaker Monitor. Lists the settings and describes the breaker monitor
function that you can use for scheduling circuit breaker maintenance.
Digital Input Debounce. Provides the settings for digital input dc debounce
or ac debounce mode of operation.
Data Reset. Lists the data reset SELOGIC control equation settings for
resetting targets, energy metering, max/min metering, demand
metering and peak demand metering.
Access Control. Describes the SELOGIC control equation setting you
would use for disabling settings changes from the relay front panel.
Time Synchronization Source. Describes the setting you would use for
choosing IRIG1 or IRIG2 as the time synchronization source.
89A and 89B Disconnect Switch Status SELOGIC Control Equations.
Describes the settings and logic associated with the disconnect
switches.
Local/Remote Breaker Control. Describes the local/remote breaker control
function.
Port Settings (SET P Command). Lists the settings that configure the relay
front- and rear-panel serial ports.