9.5
Date Code 20171021 Instruction Manual SEL-421 Relay
ASCII Command Reference
Description of Commands
MET E
Use the MET E command to view the energy import and export quantities.
The reset command, MET RE, resets the Line, BK1, and BK2 energy metering
quantities. When you issue the MET RE command, the relay responds with
Reset Energy Metering (Y/N)? If you answer Y <Enter>, the relay responds
with
Energy Metering Reset.
MET RMS
Use the MET RMS command to view root-mean-square (rms) metering quanti-
ties. The relay includes power system harmonics and subharmonics in rms quan-
tities.
NOTE: In firmware R310 and newer,
the rms value is zero when the current
is below 0.02 • I
NOM
.
MET SYN
Use the MET SYN command to view the synchronism-check reference voltage,
normalized source voltages, angles, and slip calculations.
If you have not enabled the synchronism-check function, the relay responds with
Synchronism Check Element Is Not Available. (Enable synchronism check
with the Global settings E25BK1, E25BK2, and NUMBK; see Synchronism
Check on page 5.158).
Ta b l e 9.3 M E T E Co m m a n d
Command Description Access Level
MET E Display Line energy metering data. 1, B, P, A, O, 2
MET E k Display Line energy metering data successively for k times. 1, B, P, A, O, 2
MET RE Reset Line energy metering data. P, A, O, 2
Ta b l e 9.4 MET RM S Comm a n d
Command
a
a
Parameter
n
is 1 or 2 to indicate Circuit Breaker 1 or Circuit Breaker 2.
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 Display Circuit Breaker n rms metering data. 1, B, P, A, O, 2
MET BKn RMS k Display Circuit Breaker n rms metering data succes-
sively for k times.
1, B, P, A, O, 2
Ta b l e 9.5 M E T SY N Co m m a n d
Command Description Access Level
MET SYN Display the synchronism-check values. 1, B, P, A, O, 2
MET SYN k Display the synchronism-check values successively
for k times.
1, B, P, A, O, 2
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