5.14
SEL-551 Relay Instruction Manual Date Code 20110408
Serial Port Communications and Commands
Command Explanations
To display the relay event history, enter the following command:
=>HIS <Enter>
The relay responds with the event history:
FEEDER 1 Date: 03/05/96 Time: 10:04:27.151
STATION A
# DATE TIME EVENT SHOT CURR TARGETS
1 03/05/96 10:03:49.109 TRIG 2 6
2 02/29/96 16:42:50.746 ER1 2 2487
3 02/29/96 16:16:08.837 ER2 1 5
4 02/29/96 16:16:07.174 TRIP 0 2279 INST A N
=>
IRI Command (IRIG)
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:
FEEDER 1 Date: 03/05/96 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 continuously 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 (Meter)
MET displays instantaneous magnitudes and phase angles of the following:
IA: A-phase current in primary amps
IB: B-phase current in primary amps
IC: C-phase current in primary amps
IN: Measured neutral ground current in primary amps
IG: Calculated residual current in primary amps
3I2: Calculated negative-sequence current in primary amps
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