Schweitzer Engineering Laboratories SEL-387E - Introduction; Section 10: Testing and Troubleshooting; Testing Methods and Tools; Test Features Provided by the Relay

Date Code 20080110 Testing and Troubleshooting 10-1
SEL-387E Instruction Manual
SECTION 10: TESTING AND TROUBLESHOOTING
I NTRODUCTION
Use this section for determining and establishing test routines for the SEL-387E Relay. This
section includes discussions on testing philosophies, methods, and tools. It also shows example
test procedures for metering, overcurrent elements, differential elements, and harmonic blocking
functions. Relay troubleshooting procedures are 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 by the complexities of the tests.
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.
T ESTING M ETHODS AND T OOLS
Test Features Provided by the Relay
The following features assist you during relay testing.
METER
Command
The METER command shows the currents and voltages
presented to the relay in primary values. Compare these
quantities against other devices of known accuracy.
METER SEC
Command
The METER SEC command shows the currents, voltages, and
phase angles presented to the relay in secondar
y
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.