Schweitzer Engineering Laboratories SEL-421-4 - View Synchrophasors by Using the MET PM Command

18.21
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Synchrophasors
View Synchrophasors by Using the MET PM Command
View Synchrophasors by Using the MET PM Command
The MET PM serial port ASCII command may be used to view the PMU syn-
chrophasor measurements. See METER on page 14.37 for general information on
the MET command.
The MET PM command can be used as follows.
➤ As a test tool, to verify connections, phase rotation, and scaling.
➤ As an analytical tool, to capture synchrophasor data at an exact time,
to compare it with similar data captured in other phasor measurement
unit(s) at the same time.
➤ As a method of periodically gathering synchrophasor data through a
communications processor.
Figure 18.6 shows a sample MET PM command response. The synchrophasor
data are also available via the HMI > Synchrophasor Metering menu in Quick-
Set, and has a similar format to Figure 18.6.
The MET PM command can work even when no serial or Ethernet ports are con-
figured for sending synchrophasor data.
The MET PM command will only operate when the relay is in the HIRIG time-
keeping mode, as indicated by Relay Word bit TSOK = logical 1.
RTCDFB Remote frequency rate-of-change for Channel B. Hz/s
VkmPMMD,
VkmPMAD,
VkmPMRD,
VkmPMID
a, b
Aligned phase k synchrophasor voltage (M-magnitude,
A-Angle, R-Real, I-Imaginary) Terminal m.
kV Primary,
degrees,
kV Primary,
kV Primary
V1mPMMD,
V1mPMAD,
V1mPMRD,
V1mPMID
b
Aligned positive-sequence synchrophasor voltage
(M-magnitude, A-Angle, R-Real, I-Imaginary)
Terminal m.
kV Primary,
degrees,
kV Primary,
kV Primary
IknPMMD,
IknPMAD,
IknPMRD,
IknPMID
a, c
Aligned phase k synchrophasor current (M-magnitude,
A-Angle, R-Real, I-Imaginary) Terminal n.
A Primary,
degrees,
A Primary,
A Primary
I1nPMMD,
I1nPMAD,
I1nPMRD,
I1nPMID
c
Aligned positive-sequence synchrophasor current
(M-magnitude, A-Angle, R-Real, I-Imaginary)
Terminal n.
A Primary,
degrees,
A Primary,
A Primary
SODPMD Second-of-day for all aligned data. Seconds
FOSPMD Fraction-of-second for all aligned data. Seconds
FREQPMD Aligned local system frequency. Hz
DFDTPMD Aligned local rate-of-change of frequency. Hz/s
a
k = A, B, or C.
b
m = voltage terminal.
c
n = current terminal.
Table 18.12 Synchrophasor Aligned Analog Quantities for Real-Time Control
(Sheet 2 of 2)
Name Description Units