Date Code 20011205
Testing and Troubleshooting
13-3
SEL-311A Instruction Manual
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 (
MET
) command shows the ac currents and voltages
(magnitude and phase angle) presented to the relay in primary values. In
addition, the command shows power system frequency (FREQ) and the
voltage input to the relay power supply terminals (VDC). Compare these
quantities against other devices of known accuracy. The METER command
is available at the serial ports and front-panel display. See
Section 10:
Serial Port Communications and Commands
and
Section 11: Front-Panel
Interface
.
EVENT
Command
The relay generates a 15-, 30-, or 60-cycle event report in response to faults
or disturbances. Each report contains current and voltage information, relay
element states, and input/output contact information. If you question the
relay response or your test method, use the event report for more
information. The EVENT (
EVE
) command is available at the serial ports.
See
Section 12: Standard Event Reports and SER
.
SUM
Command
The relay generates an event summary for each oscillographic event report.
Use the
SUM
command to view and acknowledge the event summaries. Use
the event summary to quickly verify proper relay operation. Compare the
reported fault current and voltage magnitudes and angles against the reported
fault location and fault type. If you question the relay response, or your test
method, obtain the oscillographic event report for a more detailed analysis.
See
Section 12: Standard Event Reports and SER
for more information on
the event summary.
SER
Command
The relay provides a Sequential Events Recorder (SER) event report that
time-tags changes in relay element and input/output contact states. The SER
provides a convenient means to verify the pickup/dropout of any element in
the relay. The
SER
command is available at the serial ports. See
Section
12: Standard Event Reports and SER
.
TARGET
Command
Use the TARGET (
TAR
) command to view the state of relay control inputs,
relay outputs, and relay elements individually during a test. The TARGET
command is available at the serial ports and the front panel. See
Section 10:
Serial Port Communications and Commands
and
Section 11: Front-Panel
Interface.
PULSE
Command
Use the PULSE (
PUL
) command to test the contact output circuits. The
PULSE command is available at the serial ports and the front panel. See
Section 10: Serial Port Communications and Commands
.
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