R.7.13
Date Code 20111215 Reference Manual SEL-421 Relay
Synchrophasors
Settings for Synchrophasors
➤ The Fast Response setting (F) represents filters with a higher
cutoff frequency. The response in frequency domain is wider
and the response in the time domain is faster. This method
results in synchrophasor data that can be used in synchrophasor
applications requiring more speed in tracing system
parameters.
PHCOMP
Enables or disables frequency-based compensation for synchrophasors.
For most applications, set PHCOMP := Y to activate the algorithm that
compensates for the magnitude and angle errors of synchrophasors for
frequencies that are off nominal. Use PHCOMP := N if you are concentrating
the SEL-421 synchrophasor data with other PMU data that do not employ
frequency compensation.
PMSTN and PMID
Defines the name and number of the PMU.
The PMSTN setting is an ASCII string with as many as 16 characters. The
PMID setting is a numeric value. Use your utility or synchrophasor data
concentrator naming convention to determine these settings.
PHDATAV and VCOMP
PHDATAV selects which voltage synchrophasors to include in the data packet.
Consider the burden on your synchrophasor processor and offline storage
requirements when deciding how much data to transmit. This setting is one of
eight settings that determine the minimum port SPEED necessary to support
the synchrophasor data packet rate and size—see Communications Bandwidth
on page R.7.26 for detailed information.
➤ PHDATAV := V1 will transmit only positive-sequence voltage,
V
1
➤ PHDATAV := ALL will transmit V
1
, V
A
, V
B
, and V
C
➤ PHDATAV := NA will not transmit any voltages
Tab le 7.5 describes the order of synchrophasors inside the data packet.
The VCOMP setting allows correction for any steady-state voltage phase
errors (from the potential transformers or wiring characteristics). See
Synchrophasor Measurement on page R.7.6 for details on this setting.
PHDATAI, PHCURR, IWCOMP, and IXCOMP
PHDATAI and PHCURR select which current synchrophasors to include in
the data packet. Consider the burden on your synchrophasor processor and
offline storage requirements when deciding how much data to transmit. These
settings are two of the eight settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page R.7.26 for detailed information.
➤ PHDATAI := I1 will transmit only positive-sequence current, I
1
➤ PHDATAI := ALL will transmit I
1
, I
A
, I
B
, and I
C
➤ PHDATAI := NA will not transmit any currents
NOTE: The PMSTN setting is not the
same as the SEL-421 Global setting
SID (Station Identifier), even though
they share the same factory default
value.
NOTE: The SEL-421 only provides
one VCOMP setting, which is applied
to both the main or alternate voltage
sources VY or VZ; respectively. See
Voltage Source Switching and Uses
on page R.1.6.
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