R.7.16
SEL-421 Relay Reference Manual Date Code 20111215
Synchrophasors
Settings for Synchrophasors
Setting FNR := I also sends the rate-of-change of frequency data with scaling.
DFDT
measured
• 100,
represented as a signed, two-byte value.
Setting FNR := F sends the measured frequency data and rate-of-change-of-
frequency as two four-byte, floating point values.
NUMANA
Selects the number of user-definable analog values to be included in the
synchrophasor data stream.
This setting is one of eight settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page R.7.26 for detailed information.
The choices for this setting depend on the synchrophasor system design.
Setting NUMANA := 0 sends no user-definable analog values.
Setting NUMANA := 1–8 sends the user-definable analog values, as
listed in Tabl e 7.6 .
The format of the user-defined analog data is always floating point, and each
value occupies four bytes.
NUMDSW
Selects the number of user-definable digital status words to be included in the
synchrophasor data stream.
This setting is one of eight settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page R.7.26 for detailed information.
The choices for this setting depend on the synchrophasor system design. The
inclusion of binary data can help indicate breaker status or other operational
data to the synchrophasor processor. See PMU Setting Example on
page R.7.28 for a suggested use of the digital status word fields.
Setting NUMDSW := 0 sends no user-definable binary status words.
Setting NUMDSW := 1 or 2 sends the user-definable binary status words,
as listed in Table 7.7 .
Table 7.6 User-Defined Analog Values Selected by the NUMANA Setting
NUMANA Setting Analog Quantities Sent
Total Number of Bytes
Used for Analog Values
0 None 0
1PMV644
2 Above, plus PMV63 8
3 Above, plus PMV62 12
4 Above, plus PMV61 16
5 Above, plus PMV60 20
6 Above, plus PMV59 24
7 Above, plus PMV58 28
8 Above, plus PMV57 32
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