18.20
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Synchrophasor Quantities
When using the relay for synchrophasor acquisition, the delayed and aligned ana-
log quantities listed in Table 18.11 are available. Be aware that these quantities are
only valid when RTCROK is asserted and only for the enabled channels. The spe-
cific channel quantities are also valid whenever their respective RTCROKc Relay
Word bit is set.
Table 18.11 Synchrophasor Analog Quantities
Name Description Units
Frequency
FREQPM Measured system frequency
a
a
Measured value if the voltages are valid and EMPU = Y, otherwise FREQPM = nominal frequency
setting NFREQ, and DFDT is zero.
Hz
DFDTPM Rate-of-change of frequency, df/dt
a
Hz/s
Synchrophasor Measurements
VkmPMM,
VkmPMA,
VkmPMR,
VkmPMI
b, c
b
k
= A, B, or C.
c
m
= voltage terminal.
Phase k synchrophasor voltage (M-magnitude, A-Angle, R-Real,
I-Imaginary) Terminal m
kV Primary,
degrees,
kV Primary,
kV Primary
V1mPMM,
V1mPMA,
V1mPMR,
V1mPMI
Positive-sequence synchrophasor voltage (M-magnitude,
A-Angle, R-Real, I-Imaginary) Terminal m
kV Primary,
degrees,
kV Primary,
kV Primary
IknPMM,
IknPMA,
IknPMR,
IknPMI
d
d
n
= current terminal.
Phase k synchrophasor current (M-magnitude, A-Angle, R-Real,
I-Imaginary) Terminal n
A Primary,
degrees,
A Primary,
A Primary
I1nPMM,
I1nPMA,
I1nPMR,
I1nPMI
Positive-sequence synchrophasor current (M-magnitude,
A-Angle, R-Real, I-Imaginary) Terminal n
A Primary,
degrees,
A Primary,
A Primary
SODPM Second of the day of the PM data s
FOSPM Fraction of the second of the PM data s
Table 18.12 Synchrophasor Aligned Analog Quantities for Real-Time Control
(Sheet 1 of 2)
Name Description Units
RTCAP01–RTCAP32 Remote phasor pairs for Channel A. Only those chan-
nels 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 chan-
nels 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
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