
Date Code 20020215
Testing and Troubleshooting
13-3
SEL-351R Instruction Manual
Because SEL-351R Recloser Controls are microprocessor-based, their operating characteristics
do not change over time. Time-overcurrent operating times are affected only by the SEL-351R
settings and applied signals. It is not necessary to verify operating characteristics as part of
maintenance checks.
At SEL, we recommend that maintenance tests on SEL-351R Recloser Controls be limited under
the guidelines provided above. The time saved may be spent analyzing event data and
thoroughly testing those systems that require more attention.
T
ESTING
M
ETHODS AND
T
OOLS
Test Features Provided by the SEL-351R
The following features assist you during SEL-351R testing.
METER
Command
The METER command shows the ac currents and voltages (magnitude and
phase angle) presented to the control in primary values. In addition, the
command shows power system frequency (FREQ). 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: Additional
Front-Panel Interface Details
.
EVENT
Command
The control generates a 15- or 30-cycle event report in response to faults or
disturbances. Each report contains current and voltage information, SEL-
351R element states, control cable pin statuses, and input/output contact
information. If you question the control response or your test method, use
the event report for more information. The EVENT command is available at
the serial ports. See
Section 12: Standard Event Reports and SER
.
SER
Command
The control provides a Sequential Events Recorder (SER) event report that
time-tags changes in control element and input/output contact states. The
SER provides a convenient means to verify the pickup/dropout of any
element in the control. The SER command is available at the serial ports.
See
Section 12: Standard Event Reports and SER
.
TARGET
Command
Use the TARGET command to view the state of control inputs, outputs, and
SEL-351R 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: Additional Front-Panel
Interface Details.
PULSE
Command
Use the PULSE 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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