Schweitzer Engineering Laboratories SEL-421-4 - Page 1436

18.30
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
SEL Fast Message Synchrophasor Protocol
See the SEL application guide “Using SEL-421 Relay Synchrophasors in Basic
Applications” (AG2002-08) for more information on the SEL Fast Message Syn-
chrophasor protocol.
Fast Message Synchrophasor Settings
The settings for SEL Fast Message synchrophasors are listed in Table 18.19.
Many of these settings are identical to the settings for the C37.118 format (see
Settings for Synchrophasors on page 18.6).
Certain settings in Table 18.19 are hidden, depending on the status of other set-
tings. For example, if PHDATAI := NA, the PHCURR setting is hidden to limit
the number of settings for your synchrophasor application.
The SEL Fast Message Synchrophasor Protocol always includes the frequency
information in floating-point representation, and fourteen user-programmable
SEL
OGIC variables PSV49–PSV64. There are no user-programmable analog
quantities in the SEL Fast Message Synchrophasor Protocol.
Communications Bandwidth
A phasor measurement unit (PMU) that is configured to transmit a single syn-
chrophasor (positive-sequence voltage, for example) at a message period of one
second places little burden on the communications channel. As more synchro-
phasors are added, or if the message rate is increased, some communications
channel restrictions come into play.
Table 18.19 PMU Settings in the Relay for SEL Fast Message Protocol (in Global
Settings)
Setting Description
EPMU Enable Synchronized Phasor Measurement (Y, N)
MFRMT Message Format (C37.118, FM)
a
a
C37.118 = IEEE Std C37.118. FM := SEL Fast Message. Set MFRMT := FM to enter the Fast Message
settings.
PMAPP PMU Application (F = Fast Response, N = Narrow Bandwidth, 1 = Extra Narrow
b
)
b
Option 1 is not available when MFRMT = FM.
PMLEGCY
c
c
PMLEGCY must be set to Y to access the data configuration settings shown in this table.
Synchrophasor Legacy Settings (Y, N)
PHCOMP Frequency-Based Phasor Compensation (Y, N)
PMID PMU Hardware ID (0–4294967295)
PHVOLT Include Voltage Terminal
PHDATAV Phasor Data Set, Voltages (V1, ALL)
VkCOMP
d
d
k = voltage terminal.
Vk Voltage Angle Compensation Factor (–179.99 to +180 degrees)
PHCURR
e
e
Setting hidden when PHDATAI := NA.
Current Source
PHDATAI
f
f
When PHDATAV:= V1, this setting is forced to NA and cannot be changed.
Phasor Data Set, Currents (ALL, NA)
InCOMP
g
g
n = current terminal.
In Angle Compensation Factor (–179.99 to +180 degrees)