8
c. Enable and set the phase overcurrent, neutral overcurrent, residual overcurrent and negative-sequence
overcurrent elements (up to four elements of each type) as required by the application.
d. Enable and set the phase time-overcurrent (TOC), maximum phase TOC, negative-sequence TOC,
neutral-ground TOC, and the residual-ground TOC elements as required by the application.
e. Enable and enter RTD settings if RTDs are supported by the relay and used for the application.
f. If ac voltage inputs are supported by the relay, enable and set the undervoltage and overvoltage elements as
required by the application.
g. If synchronism check elements are supported in the relay, enable and enter the settings per the guidance
provided in Section 4 of the SEL-751A manual.
h. Enable and set the frequency and rate-of-change of frequency elements (if supported and used for the
application).
i.
Enable and set the power factor elements (if supported and used for the application).
j.
Set the trip/close logic settings using the Relay Word bits of the enabled protection and logic elements to drive
the breaker trip logic.
k. Enable and set the recloser control elements if the relay supports the recloser control option.
l.
Enable and set demand and peak demand metering.
Group 1 Logic Settings
Enable and enter SEL
OGIC
equations settings as needed by the application.
Repeat above steps for Group 2 and 3 settings if required by the application.
Global Settings
Review, enable, and enter the Global settings required by the application. Global settings include event messenger,
synchrophasors, breaker failure, arc-flash protection, etc.
Front-Panel Settings
a. Configure relay display points. Use the front-panel display to indicate fault conditions, alarms, and operational
parameters.
b. Configure relay front-panel target indications.
Report Settings
a. Configure relay event reporting (ER) to capture relay trip conditions.
b. Configure and set the SER (sequence-of-events report) settings.
c. Configure and set the LDP (load profile report settings) report, if required.
Communications Ports and Protocol Settings
Enable and enter the communications ports and protocol settings as required by the application.
Step 4. Save the revised setting file into the database, and then with the settings still open, click the
Send Active Settings
icon
and then click
OK
when prompted to upload the revised settings into relay.
Step 5. Perform relay verification and commissioning tests per your requirements. Refer to Section 10 in the SEL-751A
manual for details on relay testing.
*PLS751A-01*
© 2007–2009 Schweitzer Engineering Laboratories, Inc. All rights reserved.
Date Code 20090
109
Relay Settings
