H.7
Date Code 20100129 Instruction Manual SEL-751A Relay
Synchrophasors
Settings for Synchrophasors
NUMANA
Selects the number of user-definable analog values to be included in the
synchrophasor data stream.
This setting is one of six settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page H.10 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 := 1–4 sends the user-definable analog
values, as listed in Table H.4.
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 six settings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page H.10 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.
➤ Setting NUMDSW := 0 sends no user-definable binary status
words.
➤ Setting NUMDSW := 1 sends the user-definable binary status
words, as listed in Table H.5.
Table H.4 User-Defined Analog Values Selected by the NUMANA Setting
NUMANA Setting Analog Quantities Sent
Total Number of Bytes
Used for Analog Values
0None 0
1MV29 4
2 Above, plus MV30 8
3 Above, plus MV31 12
4 Above, plus MV32 16
Table H.5 User-Defined Digital Status Words Selected by the NUMDSW
Setting
NUMDSW Setting Digital Status Words Sent
Total Number of Bytes
Used for Digital Values
0None 0
1 [SV32, SV31.....SV17] 2
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