18.12
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Settings for Synchrophasors
PMFRQA
Selects the PMU frequency application. A setting of S sets a smooth frequency
application. A setting of F selects a fast frequency application.
The frequency application is used in the calculation of the rate of change of fre-
quency for a given analog signal. A smooth frequency application setting
(PMFRQA = S) uses 9 cycles of data for the rate of change calculation. A fast
frequency application setting (PMFRQA = F) uses 3 cycles of data for the rate of
change calculation.
The fast frequency application will detect rapid changes in frequency faster, but
will also contain more low-level oscillations. The slow frequency application will
provide a rate of change profile that is smoother, but slower to respond to rapid
frequency fluctuations.
PHCOMP
Enables or disables frequency-based compensation for synchrophasors.
For most applications, set PHCOMP := Y to activate the algorithm that compen-
sates for the magnitude and angle errors of synchrophasors for frequencies that
are off nominal.
For PMAPP = F or N, the PMU only compensates if the estimated frequency is
±5 Hz of nominal frequency. For PMAPP = 1 the PMU compensates if the fre-
quency is ±2 Hz of nominal frequency.
Serial Port Settings
The port settings found in Table 18.3 are used for configuring synchrophasor data
transmission over a serial port.
Descriptions for some of the settings in Tab le 18.3 are as follows.
Table 18.3 Serial Port 1, 2, 3, F Settings for Synchrophasors
Setting Description
PROTO Protocol (SEL, DNP, MBA, MBB, PMU
a
)
a
The specific protocol choices available depends on the relay.
SPEED Data Speed (300–57600)
STOPBIT Stop Bits (1, 2)
RTSCTS Enable Hardware Handshaking (Y, N)
FASTOP Enable Fast Operate Messages (Y, N)
PMUMODE PMU Mode (CLIENTA, CLIENTB, SERVER)
PMODC PMU Output Data Configuration (1–5)
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