I.14
SEL-751 Relay Instruction Manual Date Code 20170927
Synchrophasors
C37.118 Synchrophasor Protocol
Figure I.7 shows a sample MET PM command response. The synchrophasor
data are also available via the HMI > Meter PM menu in
ACSELERATOR
QuickSet, and has a similar format to Figure I.7.
You can use the MET PM time command to direct the SEL-751 to display the
synchrophasor for an exact specified time, in 24-hour format. For example,
entering the command MET PM 14:14:12 results in a response similar to
Figure I.7 occurring just after 14:14:12, with the time stamp 14:14:12.000.
See Section 7: Communications for complete command options, and error
messages.
C37.118 Synchrophasor Protocol
The SEL-751 complies with IEEE C37.118, Standard for Synchrophasors for
Power Systems. The protocol is available on serial ports 2, 3, 4, and F by
setting the corresponding port setting PROTO := PMU. In addition,
synchrophasor data can be accessed through the Ethernet port when the
EPMIP setting is enabled.
This section does not cover the details of the protocol, but highlights some of
the important features and options that are available.
=>MET PM <Enter>
SEL-751 Date: 01/07/2010 Time: 20:55:21.000
FEEDER RELAY Time Source: External
Time Quality Maximum time synchronization error: 0.000 (ms) TSOK = 1
Synchrophasors
Phase Voltages Pos. Sequence Voltage
VA VB VC V1
MAG (V) 134.00 132.21 135.34 134.31
ANG (DEG) 129.22 10.57 -111.89 128.12
VS
MAG (V) 123.41
ANG (DEG) 135.00
Phase Currents Pos. Sequence Current
IA IB IC I1
MAG (A) 24.50 23.54 22.50 23.51
ANG (DEG) 120.22 1.23 -120.21 120.32
IN
MAG (A) 3.20
ANG (DEG) 141.34
FREQ (Hz) 60.000
Rate-of-change of FREQ (Hz/s) 0.00
Digitals
SV24 SV23 SV22 SV21 SV20 SV19 SV18 SV17
1 0 0 0 1 0 0 0
SV32 SV31 SV30 SV29 SV28 SV27 SV26 SV25
0 0 1 0 0 0 0 0
Analogs
MV29 4.567 MV30 100.021 MV31 980.211 MV32 1.001
=>>
Figure I.7 Sample MET PM Command Response
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