I.5
Date Code 20170927 Instruction Manual SEL-751 Relay
Synchrophasors
Settings for Synchrophasors
limit the number of settings for your synchrophasor application. Definitions
for the settings in Table I.1 are as follows.
MRATE
Selects the message rate in messages per second for synchrophasor data
streaming on serial ports.
Choose the MRATE setting that suits the needs of your PMU application. This
setting is one of seven settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size. See
Communications Bandwidth on page I.15 for detailed information.
PMAPP
Selects the type of digital filters used in the synchrophasor algorithm:
➤ The Narrow Bandwidth setting (N) represents filters with a
cutoff frequency approximately ¼ of MRATE. The response in
the frequency domain is narrower, and response in the time
domain is slower. This method results in synchrophasor data
that are free of aliasing signals and well suited for post
disturbance analysis.
➤ 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 you can use in synchrophasor
applications requiring more speed in tracking 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-751 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, VCOMP, and
VSCOMP
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
seven settings that determine the minimum port SPEED necessary to support
the synchrophasor data packet rate and size—see Communications Bandwidth
on page I.15 for detailed information.
➤ PHDATAV := V1 transmits only positive-sequence voltage, V
1
➤ PHDATAV := ALL transmit V
1
, V
A
, V
B
, V
C
, and V
S
(if
available). VAB, VBC, VCA are transmitted if DELTA_Y :=
DELTA.
➤ PHDATAV := NA does not transmit any voltages
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