R.9.31
Date Code 20111215 Reference Manual SEL-421 Relay
ASCII Command Reference
Description of Commands
The reset command, MET RM, resets the Line, BK1, and BK2 maximum/
minimum metering quantities. When you issue the MET RM command, the
relay responds,
Reset Max/Min Metering (Y/N)? If you answer Y <Enter>,
the relay responds,
Max/Min Reset.
MET PM
Use the MET PM command to view the time-synchronized line quantities.
The relay must be in the high-accuracy timekeeping HIRIG mode. For more
information on high-accuracy timekeeping, see Configuring High-Accuracy
Timekeeping on page U.4.71.
If the relay is not in the high-accuracy IRIG (HIRIG) timekeeping mode, it
will respond to the MET PM command with the following message:
Aborted: A High Accuracy Time Source is Required
If Global enable setting EPMU := N, the relay will respond to the MET PM
command with:
Synchronized phasor measurement is not enabled
To request a report of the synchrophasor data at a specific time, enter the
optional time parameter as a time of day. For example, the relay will respond
to the MET PM 16:40:10 command with:
Synchronized Phasor Measurement Data Will Be Displayed at
16:40:10.000
In this example, when the internal clock reaches 16:40:10.000, the relay will
display the synchrophasor data from that exact time. If the relay is not in
HIRIG mode at that time, it will display the following message:
Aborted: A High Accuracy Time Source is Required
Tabl e 9. 79 MET M Co mma n d
Command Description Access Level
MET M Display Line maximum/minimum metering
data.
1, B, P, A, O, 2
MET M k Display Line maximum/minimum metering
data successively for k times.
1, B, P, A, O, 2
MET BKn M
a
a
Parameter n is 1 or 2 to indicate Circuit Breaker 1 or Circuit Breaker 2.
Display Breaker n maximum/minimum meter-
ing data.
1, B, P, A, O, 2
MET BKn M k
a
Display Breaker n maximum/minimum meter-
ing data successively for k times.
1, B, P, A, O, 2
MET RM Reset maximum/minimum metering data. P, A, O, 2
Tabl e 9. 80 MET P M Comm a nd
Command Description Access Level
MET PM Display time-synchronized line values. 1, B, P, A, O, 2
MET PM k Display time-synchronized line values succes-
sively for k times.
1, B, P, A, O, 2
MET PM time Display time-synchronized line values cap-
tured at trigger time.
1, B, P, A, O, 2
MET PM HIS Display time-synchronized line values cap-
tured for the previous MET PM command.
1, B, P, A, O, 2
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