
H.10
SEL-787 Relay
Instruction Manual
Date Code 20081022
Synchrophasors
View Synchrophasors Using the MET PM Command
The Time Synchronization Relay Word bits in
status of the timekeeping function of the SEL-787.
View Synchrophasors Using the MET PM Command
The
MET PM
serial port ASCII command may be used to view the SEL-787
synchrophasor measurements. See
MET Command (Metering Data) on
for general information on the MET command.
There are multiple ways to use the
MET PM
command:
➤
As a test tool, to verify connections, phase rotation, and scaling
➤
As an analytical tool, to capture synchrophasor data at an exact
time, in order to compare it with similar data captured in other
phasor measurement unit(s) at the same time
➤
As a method of periodically gathering synchrophasor data
through a communications processor
The
MET PM
command displays the same set of analog synchrophasor
information, regardless of the Global settings PHDATAV, PHDATAI, and
PHCURR. The
MET PM
command can function even when no serial ports
are sending synchrophasor data—it is unaffected by serial port setting
PROTO.
The
MET PM
command will only operate when the SEL-787 is in the IRIG
timekeeping mode, as indicated by Relay Word bit TSOK = logical 1.
MET PM
command response. The synchrophasor
data is also available via the
HMI > Meter PM
menu in
AC
SEL
ERATOR
QuickSet, and has a similar format to
The
MET PM
time
command can be used to direct the SEL-787 to display the
synchrophasor for an exact specified time, in 24-hour format. For example,
entering the command
MET PM 14:14:12
will result in a response similar to
occurring just after 14:14:12, with the time stamp 14:14:12.000.
Table H.7
Synchrophasor Trigger Relay Word Bits
Name
Description
PMTRIG
Trigger (SEL
OGIC
)
TREA4
Trigger Reason Bit 4 (SEL
OGIC
)
TREA3
Trigger Reason Bit 3 (SEL
OGIC
)
TREA2
Trigger Reason Bit 2 (SEL
OGIC
)
TREA1
Trigger Reason Bit 1 (SEL
OGIC
)
Table H.8
Time Synchronization Relay Word Bits
Name
Description
IRIGOK
Asserts while relay time is based on IRIG-B time source.
TSOK
Time Synchronization OK. Asserts while time is based on an IRIG-B
time source of sufficient accuracy for synchrophasor measurement.
PMDOK
Phasor Measurement Data OK. Asserts when the SEL-787 is enabled
and synchrophasors are enabled (Global setting EPMU := Y).
Summary of Contents for SEL-787
Page 1: ...20081022 SEL 787 Transformer Protection Relay Instruction Manual PM787 01 NB ...
Page 6: ...This page intentionally left blank ...
Page 12: ...This page intentionally left blank ...
Page 18: ...This page intentionally left blank ...
Page 78: ...This page intentionally left blank ...
Page 206: ...This page intentionally left blank ...
Page 280: ...This page intentionally left blank ...
Page 334: ...This page intentionally left blank ...
Page 376: ...This page intentionally left blank ...
Page 388: ...This page intentionally left blank ...
Page 474: ...This page intentionally left blank ...
Page 508: ...This page intentionally left blank ...