10.18
SEL-351A Relay Instruction Manual Date Code 20080213
Serial Port Communications and Commands
Command Explanations
The TARGETS column will display any of the following illuminated front-panel
target LEDs if the event report is generated by a trip (assertion of TRIP Relay
Word bit):
➤ INST
➤ COMM
➤ SOTF
➤ 50
➤ 51
➤ 81
For more information on front-panel target LEDs, see Section 5: Trip and
Target Logic. For more information on event reports, see Section 12: Standard
Event Reports and SER.
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:
FEEDER 1 Date: 08/10/99 Time: 10:15:09.609
STATION A
=>
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.
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 five groups:
PULSE
event report generated by execution of the PUL (Pulse) command
TRIG
event report generated by execution of the TRI (Trigger) command
Relay
Response
Definition
NOTE: If the serial port AUTO setting
is DTA, the SEL-351A response for MET,
MET X, and MET D will be formatted
differently on that serial port than
shown below.
Courtesy of NationalSwitchgear.com
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