Sel SEL-421 - Synchrophasor Aligned Analog Quantities

R.7.22
SEL-421 Relay Reference Manual Date Code 20111215
Synchrophasors
Synchrophasor Analog Quantities
When using the SEL-421 for synchrophasor acquisition, the delayed and
aligned analog quantities listed in Table 7.14 are available. Be aware that these
quantities are only valid when RTCROK is asserted and only for the enabled
channels. The specific channel quantities are also valid whenever their
respective RTCROKc Relay Word bit is set.
V1LPMM Synchrophasor positive-sequence voltage
magnitude
kV
b
V1LPMA Synchrophasor positive-sequence voltage
angle
degrees
V1LPMR Synchrophasor positive-sequence voltage,
real component
kV
b
V1LPMI Synchrophasor positive-sequence voltage,
imaginary component
kV
b
SODPM Second-of-day of the synchrophasor data s
FOSPM Fraction-of-second of the synchrophasor
data
s
a
Measured value if the voltages are valid and EMPU = Y, otherwise FREQ_PM = nominal
frequency setting NFREQ, and DFDT is zero.
b
Primary value of measurement.
Table 7.14 Synchrophasor Aligned Analog Quantities (Sheet 1 of 3)
Name Description Units
RTCAP01–RTCAP32 Remote phasor pairs for channel A. Only
those channels provided by the remote are
valid to use. Use the RTC command to
confirm interpretation of these quantities.
RTCBP01–RTCBP32 Remote phasor pairs for channel B. Only
those channels provided by the remote are
valid to use. Use the RTC command to
confirm interpretation of these quantities.
RTCAA01–RTCAA08 Remote analogs for channel A. Only those
channels provided by the remote are valid to
use. Use the RTC command to confirm
interpretation of these quantities.
RTCBA01–RTCBA08 Remote analogs for channel B. Only those
channels provided by the remote are valid to
use. Use the RTC command to confirm
interpretation of these quantities.
RTCFA Remote frequency for channel A Hz
RTCFB Remote frequency for channel B Hz
RTCDFA Remote frequency rate-of-change for
channel A
Hz/s
RTCDFB Remote frequency rate-of-change for
channel B
Hz/s
IAWPMMD, IBWPMMD,
ICWPMMD
Aligned local current magnitude
(I_W terminal)
A
a
IAWPMAD, IBWPMAD,
ICWPMAD
Aligned local current angle (I_W terminal) degrees
IAWPMRD, IBWPMRD,
ICWPMRD
Aligned local current real component
(I_W terminal)
A
a
Table 7.13 Synchrophasor Analog Quantities (Sheet 3 of 3)
Name Description Units