
10.16
SEL-587Z Instruction Manual
Date Code 20020903
Testing and Troubleshooting
Maintenance Testing
Maintenance Testing
The SEL-587Z uses extensive self-testing routines and features detailed
metering and event reporting functions. These features reduce your
dependence on routine maintenance testing. When you want to perform
maintenance testing, follow the recommendations in
.
You can use the SEL-587Z reporting features as maintenance tools.
Periodically compare the relay
METER
command output to other meter
readings on a line to verify that the relay measures currents and voltages
correctly and accurately.
Each occurrence of a fault tests the protection system and relay application.
Review relay event reports in detail after each fault to determine the areas
needing your attention. Use the event report current, voltage, and relay
element data to determine that the relay protection elements and
communications channels operate properly. Inspect event report input and
output data to determine whether the relay asserts outputs at the correct times
and whether auxiliary equipment operates properly.
At each maintenance interval, the only items to test are those that have not
operated (via fault conditions and otherwise) during the maintenance interval.
The basis for this testing philosophy is simple: you do not need to perform
further maintenance testing for a correctly set and connected relay that
measures the power system properly and for which no relay self-test has
failed.
The SEL-587Z is based on microprocessor technology; the relay internal
processing characteristics do not change over time. For example, if time-
overcurrent element operating times change, these changes occur because of
alterations to relay settings and/or differences in the signals applied to the
relay. You do not need to verify relay element operating characteristics as a
part of maintenance checks.
SEL recommends that you limit maintenance tests on SEL relays according to
the guidelines listed in
. You will spend less time
checking relay operations that function correctly. You can use the time you
save to analyze event data and thoroughly test systems needing more attention.
Table 10.5
Maintenance Testing
Details
Description
Time
Test at scheduled intervals or when there is an indication of a problem with the
relay or power system.
Goals
Confirm that the relay is measuring ac quantities accurately.
Check that scheme logic and protection elements function correctly.
Verify that auxiliary equipment functions correctly.
Tests
Test all relay features/power system components that did not operate during
an actual fault within the past maintenance interval.
Содержание SEL-587Z
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