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3 Phase Power Quality Analyzer
Glossary
51
On polyphase systems, a voltage interruption begins when the voltages of all channels fall
below the voltage interruption threshold and ends when the voltage on any one channel is
equal to, or greater than, the voltage interruption threshold plus the hysteresis.
Note
On polyphase systems, the event is still classified as a dip when the voltage of only one
or two phases falls below the interruption limit.
Parameters to configure:
Limit
The threshold limit value is defined as % of nominal voltage. The default value is 5 % and
the hysteresis is 2 %.
Rapid Voltage Changes. Rapid voltage changes (RVC) are quick transitions of the RMS voltage
between two steady states. Rapid voltage changes are captured based on RVC threshold. RVC
threshold are set as percentage of the nominal voltage and the threshold level is calculated
over the preceding 100/120 U
RMS
(1/2) values. 100/120 is defined as 100 values for 50 Hz
nominal or 120 values for 60 Hz nominal.
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