PHQVVR contains a blocking functionality. It is possible to block a set of function
outputs or the function itself, if desired.
10.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of the voltage variation detection function can be described with a
module diagram. All the modules in the diagram are explained in the next sections.
GUID-91ED3E3D-F014-49EE-B4B0-DAD2509DD013 V1 EN
Figure 413: Functional module diagram
10.3.4.1 Phase mode setting
PHQVVR is designed for both single-phase and polyphase ac power systems, and
selection can be made with the Phase mode setting, which can be set either to the
"Single Phase" or "Three Phase" mode. The default setting is "Single Phase".
The basic difference between these alternatives depends on how many phases are
needed to have the voltage variation activated. When the Phase mode setting is
"Single Phase", the activation is straightforward. There is no dependence between
the phases for variation start. The START output and the corresponding phase start
are activated when the limit is exceeded or undershot. The corresponding phase
start deactivation takes place when the limit (includes small hysteresis) is
undershot or exceeded. The START output is deactivated when there are no more
active phases.
However, when Phase mode is "Three Phase", all the monitored phase signal
magnitudes, defined with Phase supervision, have to fall below or rise above the
limit setting to activate the START output and the corresponding phase output, that
1YHT530004D05 D Section 10
Power quality measurement functions
615 series 773
Technical Manual
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