5.10
SEL-751A Relay Instruction Manual Date Code 20100129
Metering and Monitoring
Metering
=>>MET PE<Enter>
SEL-751A Date: 12/01/2008 Time: 15:44:43
FEEDER RELAY Time Source: External
IAPD IBPD ICPD IGPD 3I2PD
PEAK DEM (A pri.) 835.7 868.4 795.7 83.8 54.2
LAST RESET = 11/14/2008 11:32:01
=>>
Figure 5.13 Device Response to the MET PE Command
Synchrophasor
Metering
The METER PM serial port ASCII command may be used to view the
SEL-751A 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, 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 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.
NOTE: In order to have the MET PM
xx:yy:zz response transmitted from a
serial port, the corresponding port
must have the AUTO setting set to
YES (Y).
The METER PM command will only operate when the SEL-751A 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.
Table H.4 in Appendix H: Synchrophasors, shows a sample METER PM
command response. The METER PM XX:XX:XXX command can be used
to direct the SEL-751A to display the synchrophasor for an exact specified
time, in 24-hour format. For example, entering the command METER PM
14:14:12 will result in a response similar to Figure H.4, 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 Meter Values
All Models Currents: IA, IB, IC, IN, I1 (positive-sequence current) magnitudes (A primary) and phase angles (deg)
Digitals TSOK and SV17–SV32 Relay Word Bit status
Analogs MV29–MV32 Math Variables
a
System Frequency (Hz)
Rate-of-change of Frequency (Hz/Second)
Additional Data With
Voltage Option
Voltage phasors: VA, VB, VC, VS (if available), and V1 (positive-sequence voltage), magnitudes (V or
kV) and phase angles (deg)
a
This data is calculated every 100 ms. Only the data that occurs at the “Top of the Second” will be used for METER PM responses.
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