18.8
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Settings for Synchrophasors
PMAPP
Selects the type of digital filters used in the synchrophasor measurement.
➤ The Narrow Bandwidth setting (N) represents filters with a cutoff
frequency approximately 1/4 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 the 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.
➤ The Filter One setting (1) represents filters that have a response much
narrower than the narrow bandwidth filters. This method has a better
step response with overshoot within 7.5 percent. This filter is
available only for MRATE = 60.
PMLEGCY
This setting is provided for supporting legacy synchrophasor settings. Set this to
N to access the latest features. See Legacy Settings on page 18.16 to see a
description of the legacy settings. The remainder of this subsection describes the
non-legacy settings.
NUMPHDC
Enables as many as five unique synchrophasor data configurations.
The four serial ports (Port 1, 2, 3, and F) and two Ethernet sessions (TCP/UDP
sessions 1 and 2) can be mapped to any of these five data configurations. In other
words each port can be configured to send unique synchrophasor data streams.
PMSTN
q
and PMID
q
Defines the station name and number of the PMU for data configuration q.
The PMSTNq setting is an ASCII string with as many as 16 characters. The
PMIDq setting is a numeric value. Use your utility or synchrophasor data con-
centrator naming convention to determine these settings. PMSTNq allows all
printable characters.
Phasors Included in the Data
q
Terminal Name, Relay Word Bit, Alternate Terminal Name
Specify the terminal for Synchrophasor measurement and transmission in the
synchrophasor data stream q.
This is a freeform setting category for enabling the terminals for synchrophasor
measurement and transmission. This freeform setting has three arguments. Spec-
ify the terminal name (any one of the valid terminals for the relay) for the first
argument. Specify any Relay Word bit for the second argument. Specify the alter-
nate terminal name (any one of the valid terminals for the relay) for the third
argument.
The second and third arguments are optional unless switching between terminals
is required. Whenever the Relay Word bit in the second argument is asserted the
terminal synchrophasor data are replaced by the alternate terminal data.
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