18.10
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Settings for Synchrophasors
FNR
q
Selects the numeric representation, integer (I) or floating-point (F), of the two
frequency values in the synchrophasor data stream q.
This setting affects the synchrophasor data packet size.
➤ FNRq := I sends the frequency data as a difference from nominal
frequency, NFREQ, with the following formula.
(FREQPM – NFREQ) • 1000,
represented as a signed, two-byte value. See Synchrophasor
Frequency on page 18.5 for details.
➤ FNRq := I also sends the rate-of-change of frequency data with
scaling.
DFDTPM • 100,
represented as a signed, two-byte value. See Synchrophasor
Frequency on page 18.5 for details.
➤ FNRq := F sends the measured frequency data and rate-of-change-of-
frequency as two four-byte, floating point values.
Phasor Aliases in Data Configuration
q
Phasor Name, Alias Name
This is a freeform setting category with two arguments. Specify the phasor name
and a 16 character descriptive name to be included in the synchrophasor data
stream q. If a phasor is not assigned a descriptive name, it will be described using
the phasor name.
Analog Quantities in Data Configuration
q
Analog Quantity Name, Alias Name
This is a freeform setting category with two arguments. Specify the analog quan-
tity name and an optional 16 character descriptive name to be included in the syn-
chrophasor data stream q. See Section 12: Analog Quantities in the product-
specific instruction manual for a list of analog quantities that the PMU supports.
The PMU can be configured for as many as 16 unique analog quantities for each
data configuration q. The analog quantities are floating point values, so each ana-
log quantity the PMU includes will take four bytes.
Digitals in Data Configuration
q
Relay Word Bit Name, Alias Name
This is a freeform setting category with two arguments. Specify the Relay Word
bit name and an optional 16 character descriptive name that you need to include
in the synchrophasor data stream q. See the Relay Word Bits section of the relay-
specific instruction manual for a list of Relay Word bits that the PMU supports.
You can configure the PMU for as many as 64 unique digitals for each data con-
figuration.
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