VSQVUB contains a blocking functionality. It is possible to block a set of function
outputs or the function itself.
10.4.4 Analog channel configuration
VSQVUB has one analog group input which must be properly configured.
Table 1641: Analog inputs
Input Description
U3P Three-phase voltages
See the preprocessing function blocks in this document for the possible
signal sources.
There are a few special conditions which must be noted with the configuration.
Table 1642: Special conditions
Condition Description
U3P connected to real meas-
urements
The function can work with any two voltage channels con-
nected but it is recommended to connect all three voltage
channels.
Further, if
VT connection
is "Delta" in that particular UTVTR,
the
Unb detection method
cannot be set to "Zero Seq" or
"Zero to Pos Seq".
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
For troubleshooting, check the contents of this chapter and also the preprocessing
blocks in this document. The configuration can be written to the protection relay
once the mismatch is corrected.
10.4.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of VSQVUB can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
1MRS759142 F
Power quality measurement functions
REX640
Technical Manual
1849
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