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SECTION VI THEORY OF OPERATION
Utrecht
- Page
55 - Ref 001
4. VOLTAGE ANOMALY RECORDING
Voltage anomalies occur when a voltage exceeds preset boundaries. The rms voltages of
each half input cycle are used for comparison. For every Voltage Anomaly detected, the
Instrument stores:
Date & time when the anomaly started.
The nominal voltage.
Minimum or maximum voltage during the anomaly.
The previous 64 rms values, calculated on half input cycles (half periods), before
the anomaly occurred.
Voltage Anomaly recording is enabled on selected voltage inputs and can be calculated
based either on a fixed tolerance window or on a variable tolerance window.
In Fixed Tolerance Mode, the nominal voltage is set by user and the high and low
limits are set as a percentage of nominal voltage. (fig. 43)
In Variable Tolerance Mode, the nominal voltage is calculated and is the average
voltage during the previous anomaly integration period (settable between 1 and
900 seconds). The new nominal reference voltage can be up to ± 30% of
programmed nominal voltage. High and low limits are set as a percentage of the
nominal voltage and can be between ± 1% and ± 30% of the nominal voltage.
(fig. 43)
fig 43
fig 44
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