R.9.32
SEL-421 Relay Reference Manual Date Code 20111215
ASCII Command Reference
Description of Commands
After the MET PM time command is issued, other MET PM commands may
be entered without affecting the timed request, even if the stated time has not
arrived. However, issuing a second MET PM time command while the first
command is still pending will cancel the first command request in favor of the
newer request.
If you are not connected to the relay when the MET PM time command issues
its timed response, you can use the MET PM HIS command to view this
response. This permits you to issue MET PM time to multiple relays using a
common time and then go back later to see the results from all the relays at
this common instant in time.
See Section 7: Synchrophasors for more information on phasor measurement
functions, and View Synchrophasors by Using the MET PM Command on
page R.7.24 for sample MET PM responses.
MET PMV
Use the MET PMV command to view the protection math variables.
The last 16 protection math variables are PMV49 through PMV64. The relay
displays three places after the decimal point for these numerals. The relay
shows variables with absolute value greater than 99999.999 or less than 0.100
as scientific notation (for example, –1.002E+22).
MET RMS
Use the MET RMS command to view rms (root mean square) metering
quantities. The relay includes power system harmonics and subharmonics in
rms quantities.
Table 9.81 MET PMV Command
Command Description Access Level
MET PMV Display the last 16 protection math variables. 1, B, P, A, O, 2
MET PMV k Display the last 16 protection math variables
successively for k times.
1, B, P, A, O, 2
MET PMV A Display all protection math variables. 1, B, P, A, O, 2
MET PMV A k Display all protection math variables succes-
sively for k times.
1, B, P, A, O, 2
Table 9.82 MET RMS Command
Command Description Access Level
MET RMS Display Line rms metering data. 1, B, P, A, O, 2
MET RMS k Display Line rms metering data successively
for k times.
1, B, P, A, O, 2
MET BKn RMS
a
a
Parameter n is 1 or 2 to indicate Circuit Breaker 1 or Circuit Breaker 2.
Display Circuit Breaker n rms metering data. 1, B, P, A, O, 2
MET BKn RMS k Display Circuit Breaker n rms metering data
successively for k times.
1, B, P, A, O, 2
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