R.7.32
SEL-421 Relay Reference Manual Date Code 20111215
Synchrophasors
SEL Fast Message Synchrophasor Protocol
On a 60 Hz nominal power system (NFREQ := 60), SEL-421 firmware
version R112 and above can support the same message periods (1000, 500,
250, 200, 100, and 50 ms) as those supported by prior firmware versions.
On a 50 Hz nominal power system (NFREQ := 50), SEL-421 firmware
version R112 and above can support all but two of the same message periods
that prior firmware versions supported. Message periods 1000, 500, 200, and
100 ms are supported, while message periods 250 and 50 ms are unavailable.
Another difference is found in the serial port PROTO settings, where a new
settings choice, PMU, is available. Beginning with SEL-421 firmware version
R112, the SEL Fast Message synchrophasor protocol is only available on
ports set to PROTO := PMU. In previous firmware versions, the SEL Fast
Message synchrophasor protocol operated on ports set to PROTO := SEL.
This separation of general serial port access from the PMU function was
designed to enhance security and performance.
Beginning with SEL-421 firmware version R112, the settings for SEL Fast
Message format are different than firmware version R102–R111. The new
settings are in the Global settings class—see Upgrading Previous SEL-421
Synchrophasor Settings on page R.7.34.
SEL-421 Fast Message
Synchrophasor
Settings
The settings for SEL Fast Message synchrophasors are listed in Table 7.21.
Many of these settings are identical to the settings for the C37.118 format. See
Settings for Synchrophasors on page R.7.9.
Certain settings in Table 7.21 are hidden, depending on the status of other
settings. For example, if PHDATAI := NA, the PHCURR setting is hidden to
limit the number of settings for your synchrophasor application.
Table 7.21 PMU Settings in the SEL-421 for SEL Fast Message Protocol,
in Global Settings
Setting Description Default
EPMU Enable Synchronized Phasor
Measurement (Y, N)
N
a
a
Set EPMU := Y to access the remaining settings
MFRMT Message Format (C37.118, FM)
b
b
C37.118 = IEEE C37.118 Standard—see Tab le 7 . 1; FM := SEL Fast Message. Set MFRMT := FM to
enter the Fast Message settings.
C37.118
PMAPP PMU Application (F = Fast Response,
N = Narrow Bandwidth)
N
PHCOMP Frequency-Based Phasor Compensation
(Y, N)
Y
PMID PMU Hardware ID
(0x00000000–0xFFFFFFFF)
0x00000001
PHDATAV Phasor Data Set, Voltages (V1, ALL) V1
VCOMP Voltage Angle Compensation Factor
(–179.99 to 180 degrees)
0.00
PHDATAI
c
c
When PHDATAV := V1, this setting is forced to NA and cannot be changed.
Phasor Data Set, Currents (ALL, NA) NA
PHCURR
d
d
Setting hidden when PHDATAI := NA
Current Source (IW, IX, COMB) IW
IWCOMP IW Angle Compensation Factor
(–179.99 to 180 degrees)
0.00
IXCOMP IX Angle Compensation Factor
(–179.99 to 180 degrees)
0.00
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