H.14
SEL-700G Relay
Instruction Manual
Date Code 20170814
Synchrophasors
View Synchrophasors Using the MET PM Command
The Relay Word bit PMDOK indicates that the phasor measurement data are
acceptable and asserts under the following conditions.
➤
The relay is enabled
➤
EPMU = Y
➤
IRIGOK = 1
➤
TSOK = 1
➤
The synchrophasor filter buffers are fully primed
➤
The magnitude of the positive-sequence voltage, |V1| > 10 V
➤
The frequency is 40–70 Hz
PMDOK takes 15 seconds to assert when the relay is first powered, after any
of the settings in Table H.1 are changed, or when an IRIG-B time signal is first
connected. This is because of the delay in time qualification (TSOK to assert).
View Synchrophasors Using the MET PM Command
You can use the MET PM serial port ASCII command to view the SEL-700G
synchrophasor measurements. See MET Command (Metering Data) on
page 7.35 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, 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, PHDATAI,
PHVOLT, 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 only operates when the SEL-700G is in the IRIG
timekeeping mode, as indicated by Relay Word bit TSOK = logical 1.
1
0
0
0
8
10 milliseconds
1
0
0
1
9
100 milliseconds
1
0
1
0
10
1 second
1
0
1
1
11
10 seconds
1
1
0
0
12
100 seconds
1
1
0
1
13
1000 seconds
1
1
1
0
14
10000 seconds
1
1
1
1
15
Fault
Table H.9
TQUAL Bits Translation to Time Quality
(Sheet 2 of 2)
TQUAL8
TQUAL4
TQUAL2
TQUAL1
Value
Time Quality
NOTE:
To have the MET PM xx:yy:zz
response transmitted from a serial
port, the corresponding port must
have the AUTO setting set to Y (YES).
Содержание SEL-700G Series
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