Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Section 10
Testing and Troubleshooting
Overview
The Testing section should be used for determining and establishing test
routines for the SEL-387 Relay. Included are discussions on testing
philosophies, methods, and tools. Example test procedures are shown for the
overcurrent elements, differential elements, harmonic blocking functions,
Restricted Earth Fault protection, and metering. Relay troubleshooting
procedures are shown at the end of the section.
Protective relay testing may be divided into three categories: acceptance,
commissioning, and maintenance testing. The categories are differentiated by
when they take place in the life cycle of the relay, as well as in the test
complexity.
The paragraphs below describe when each type of test is performed, the goals
of testing at that time, and the relay functions that you need to test at each
point. This information is intended as a guideline for testing SEL relays.
Testing Methods and Tools
Test Features
Provided by the Relay
The following features will assist you during relay testing.
For more information on these features and commands, see Section 7: Serial
Port Communications and Commands.
Table 10.1 Features to Use to Test the Relay
METER Command
The METER command shows the currents presented to the
relay in primary values. Compare these quantities against
other devices of known accuracy.
EVENT Command
The relay generates an event report in response to faults or
disturbances. Each report contains current information,
relay element states, and input/output contact information.
If you question the relay response or your test method, use
the EVENT command to display detailed information.
TARGET,
TARGET F Command
Use the TARGET n command to view
the state of relay control inputs, relay outputs,
and relay elements individually during a test.
SER Command
Use the Sequential Events Recorder for timing
tests by setting the SER trigger settings (SER1, SER2,
SER3, or SER4) to trigger for specific elements asserting or
deasserting. View the SER with the SER command.
Programmable Outputs
Programmable outputs allow you to isolate individual relay
elements. Refer to the SET command.
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