5.11
Date Code 20150130 Instruction Manual SEL-787 Relay
Metering and Monitoring
Metering
Synchrophasor
Metering
The MET PM serial port ASCII command may be used to view the SEL-787
synchrophasor measurements. 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.
Table 5.9 below, shows the measured values for the MET PM Command.
Figure H.4 in Appendix H: Synchrophasors, shows a sample MET PM
command response. 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 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.
=>MET H <Enter>
SEL-787 Date: 01/23/2008 Time: 13:44:27
TRNSFRMR RELAY Time Source: Internal
IAW1 IBW1 ICW1 IAW2 IBW2 ICW2 IN VAB VBC VCA
Fund (sec) 1.0 1.0 1.0 2.0 2.0 2.0 1.2 67.2 66.1 117.7
2nd (%) 0.3 0.4 0.5 0.2 0.3 0.3 0.4 0.0 0.0 0.0
3rd (%) 0.5 0.6 0.6 0.2 0.3 0.2 0.3 0.0 0.0 0.0
4th (%) 0.4 0.4 0.5 0.2 0.2 0.3 0.2 0.0 0.0 0.0
5th (%) 0.6 0.6 0.9 0.3 0.3 0.2 0.4 0.0 0.0 0.0
THD (%) 0.9 1.0 1.2 0.5 0.5 0.5 0.7 0.0 0.0 0.0
=>
Figure 5.14 METER H Command Report
Table 5.9 Synchrophasor Measured Values
Relay Option Meter Values
All Models Currents: IAW1, IBW1, ICW1, I1W1 (Winding 1 positive-sequence current) and IAW2, IBW2, ICW2,
I1W2 (Winding 2 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) = 50 or 60 Hz
Rate of change of Frequency = 0
With Voltage Option Voltage phasors: VAB, VBC, VCA or VAN, VBN, VCN, and V1 (positive-sequence voltage),
magnitudes (V or kV) and phase angles (deg)
System Frequency (Hz)
Rate of change of Frequency (Hz/s)
a
These data are calculated every 100 ms. Only the data that occurs at the “Top of the Second” will be used for MET PM responses.
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