H.5
Date Code 20081022 Instruction Manual SEL-787 Relay
Synchrophasors
Settings for Synchrophasors
The Port settings for PROTO := PMU, shown in Table H.2, do not include the
settings DATABIT and PARITY; these two settings are internally fixed as
DATABIT := 8, PARITY := N (None). See Section 7: Communications for
descriptions of these functions.
PROTO := PMU Does Not Allow Commands on That Serial Port
The PROTO := PMU settings choice in Table H.2 can be made even when
Global setting EPMU := N. However, in this situation, the serial port will not
respond to any commands or requests. Either enable synchrophasors by
making the Table H.1 settings, or change the port PROTO setting to SEL.
If you use a computer terminal session or
ACSELERATOR
®
QuickSet
®
SEL-5030 software connected to a serial port, and then set that same serial
port PROTO setting to PMU, you will lose the ability to communicate with the
relay through ASCII commands or virtual file interface commands. If this
happens, either connect via another serial port (that has PROTO := SEL) or
use the front-panel HMI SET/SHOW screen to change the disabled port
PROTO setting back to SEL.
Descriptions of Synchrophasor Settings
Definitions for the settings in Table H.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 six settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size. See
Communications Bandwidth on page H.12 for detailed information.
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.
Ta b le H. 2 SE L -787 Serial Port Settings for Synchrophasors
Setting Description Default
PROTO Protocol (SEL, MOD, EVMSG, PMU,
MBA, MBB, MB8A, MB8B, MBTA,
MBTB)
a,
b
a
Some of the other PROTO setting choices may not be available.
b
Setting choice PMU is not available on PORT 1.
SEL
c
c
Set PROTO := PMU to enable (on this port) the synchrophasor protocol.
SPEED Data Speed (300, 1200, 2400, 4800, 9600,
19200, 38400 bps)
9600
STOPBIT Stop Bits (1, 2) 1
RTSCTS HDWR HANDSHAKING (Y, N) N
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