for the detection of undervoltage either in a single phase, two phases or three
phases.
The function contains a blocking functionality. It is possible to block function
outputs, timer or the function itself.
4.5.2.4 Analog channel configuration
PHPTUV has one analog group input which must be properly configured.
Table 790: 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 791: Special conditions
Condition Description
U3P connected to real measurements The function can work with one voltage chan-
nel connected if
Num of start phases
is set to
"1 out of 3" but the other two channels must
be fed with high values (considerably above
Start value
). For other values of
Num of start
phases
, all three voltage channels must be
connected.
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.
4.5.2.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of PHPTUV can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
1MRS759142 F
Protection functions
REX640
Technical Manual
859
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