Schweitzer Engineering Laboratories SEL-700G Series, Instruction Manual

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5.12
SEL-700G Relay Instruction Manual Date Code 20170814
Metering and Monitoring
Metering
Synchrophasor
Metering
The METER PM serial port ASCII command is used to view SEL-700G
synchrophasor measurements. There are multiple ways to use the METER
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, so that this information can be compared 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 METER PM command displays the same set of analog synchrophasor
information, regardless of the global settings PHDATAV, PHDATAI, and
PHCURR. The METER PM command can function even when no serial
ports are sending synchrophasor data.
The METER PM command only operates when the SEL-700G is in the IRIG
timekeeping mode, as indicated by Relay Word bit TSOK = logical 1.
Table 5.7 below, shows the measured values for the METER PM Command.
Figure H.7 in Appendix H: Synchrophasors shows a sample METER PM
command response. You can use the METER PM xx:yy:zzz command to
direct the SEL-700G to display the synchrophasor for an exact specified time,
in 24-hour format. For example, entering the command METER PM
14:14:12 results in a response similar to Figure H.7, occurring just after
14:14:12, with the time stamp 14:14:12.000. Refer to Appendix H:
Synchrophasors, for further details on synchrophasor measurements, settings,
C37.118 Protocol, etc.
Table 5.7 Synchrophasor Measured Values
Relay Option Fundamental Meter Values
X-Side Quantities
(model dependent)
➤
Fundamental current phasors IAX, IBX, and ICX and positive-
sequence current I1X
➤
Wye-connected input voltages (with respect to neutral): Funda-
mental voltage phasors VAX, VBX, and VCX and positive-
sequence voltage V1X
➤
Delta-connected input voltages: Fundamental voltage phasors
VABX, VBCX, and VCAX and positive-sequence voltage V1X
➤
Frequency (FREQX) in Hz
➤
df/dt in Hz/s
Y-Side Quantities
(model dependent)
➤
Fundamental current phasors IAY, IBY, and ICY and positive-
sequence current I1Y
➤
Wye-connected input voltages (with respect to neutral): Funda-
mental voltage phasors VAY, VBY, and VCY and positive-
sequence voltage V1Y
➤
Delta-connected input voltages: Fundamental voltage phasors
VABY, VBCY, and VCAY and positive-sequence voltage V1Y
➤
Frequency (FREQY) in Hz
➤
df/dt in Hz/s
Digitals TSOK and SV17–SV32 Relay Word bit status
Other Analog
(model dependent)
➤
Synchronism-check voltage input (VS) magnitude
➤
Neutral current input (IN) magnitude
➤
MV29–MV32 Math Variables
a
a
These data are calculated every 100 ms. Only the data that occur at the "Top of the Second"
are used for METER PM responses.
NOTE:
To have the MET PM
xx:yy:zzz response transmitted from a
serial port, the corresponding
port must have the AUTO setting set
to Y (YES).