L.12
SEL-351A Relay Instruction Manual Date Code 20080213
SEL Synchrophasors
View Synchrophasors by Using the MET PM Command
View Synchrophasors by Using the MET PM
Command
The MET PM serial port ASCII command may be used to view the
SEL-351A synchrophasor measurements. See MET Command (Metering
Data) on page 10.18 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 this information 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 and PHDATAI. The
MET PM command can function even when no serial ports are sending fast
message synchrophasor data.
The MET PM command only displays data when the Relay Word bit TSOK =
logical 1. Figure L.4 shows a sample MET PM command response. The
synchrophasor data are also available in
ACSELERATOR
®
QuickSet
™
and have
a similar format to Figure L.4.
The MET PM [time] command can be used to direct the SEL-351A 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
Figure L.4 occurring just after 14:14:12, with the time stamp 14:14:12.000.
This method of data capture always reports from the exact second, even if the
time parameter is entered with fractional seconds. For example, entering MET
PM 14:14:12.200 results in the same data capture as MET PM 14:14:12,
because the relay ignored the fractional seconds.
See MET PM—Synchrophasor Metering on page 10.23 for complete
command options, and error messages.
Courtesy of NationalSwitchgear.com
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