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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 PHQVVR can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
U_A
U_B
U_C
I_A
I_B
I_C
Figure 360: 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 is, all the monitored phases have to be activated. Accordingly, the deactivation
occurs when the activation requirement is not fulfilled, that is, one or more
monitored phase signal magnitudes return beyond their limits. Phases do not need
to be activated by the same variation type to activate the
START
output. Another
1MRS758755 C
Power quality measurement functions
REC615 & RER615
Technical Manual
709
Содержание Relion REC615
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