10.20
SEL-311C Relay Instruction Manual Date Code 20060320
Serial Port Communications and Commands
Command Explanations
For more information on front-panel target LEDs, see Section 5: Trip and
Targ et Log ic. For more information on event reports, see Section 12: Standard
Event Reports and SER.
For more information on event summaries, see SUM Command (Long
Summary Event Report) on page 10.31.
IRI Command (Synchronize to IRIG-B Time Code)
IRI directs the relay to read the demodulated IRIG-B time code at the serial
port input.
To force the relay to synchronize to IRIG-B, enter the following command:
=>IRI <Enter>
If the relay successfully synchronizes to IRIG, it sends the following header
and access level prompt:
SEL-311C POTT Date: 10/12/99 Time: 16:22:04.372
EXAMPLE: BUS B, BREAKER 3
=>
If no IRIG-B code is present at the serial port input or if the code cannot be
read successfully, the relay responds:
IRIG-B DATA ERROR
=>
If an IRIG-B signal is present, the relay synchronizes its internal clock with
IRIG-B. It is not necessary to issue the IRI command to synchronize the relay
clock with IRIG-B. Use the IRI command to determine if the relay is properly
reading the IRIG-B signal. In addition, the Relay Word bit TIRIG = logical 1
when the relay is properly reading an IRIG-B signal.
MET Command (Metering Data)
The MET commands provide access to the relay metering data. Metered
quantities include phase voltages and currents, sequence component voltages
and currents, power, frequency, substation battery voltage, energy, demand,
and maximum/minimum logging of selected quantities. To make the extensive
amount of meter information manageable, the relay divides the displayed
information into four groups:
➤ Instantaneous
➤ Demand
➤ Energy
➤ Maximum/Minimum
MET k-Instantaneous Metering
The MET k command displays instantaneous magnitudes (and angles if
applicable) of the following quantities:
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