13.5
Date Code 20060320 Instruction Manual SEL-311C Relay
Testing and Troubleshooting
Testing Methods and Tools
Testing Methods and Tools
Test Features
Provided by the Relay
Use the features listed in Table 1 3.1 to assist you during relay testing.
Table 13.1 Features Useful for Relay Testing
Commands Description
METER The (METER) MET command shows the ac currents and voltages
(magnitude and phase angle) presented to the relay in primary val-
ues. 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 MET 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 (Only on
Models With LCD).
EVENT The relay generates a 15-, 30-, or 60-, or 180-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 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 magni-
tudes 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 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 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 Inter-
face (Only on Models With LCD).
PULSE 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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