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Flicker:
•
Pst:
The
QNA-P/PV
saves the Flicker value (Pst) obtained over the
recording period. The Plt value will be calculated by the data analysis
software in the PC.
Harmonics:
Harmonic distortion:
The
QNA-P/PV
will calculate and record in the
memory the value of the average voltage harmonic distortion detected in
the monitored power system.
Harmonic content:
The
QNA-P/PV
will calculate and record in the
memory the average value of the individual harmonic distortion rate for
each voltage harmonic in the monitored power system (up to the 40
th
harmonic) (harmonic content of each 10-cycle blocks which have been
integrated over a recording period).
Direction of the harmonics:
The
QNA-P/PV
allows the direction of the
individual harmonics to be displayed, indicating if a specific harmonic is
being generated by the user or is being generated outside the installation.
Wave types:
Voltage:
Records one cycle of the voltage signal wave type on finishing
the recording.
Current:
Records one cycle of the current signal wave type on finishing
the recording.
Unbalance:
Asymmetry rate:
ratio of homo-polar voltage to direct voltage.
Unbalance rate:
ratio of inverse voltage to direct voltage.
8.2.2.- Events file (EVQ)
The analyzer also records an events file containing information on any event
detected in the monitored power system. The following data is saved about each
event:
Event date:
Indication of the time of the event. This value is obtained with an
accuracy of one cycle.
Type of event:
Indication of the event type, i.e. a voltage dip, a voltage swell
or an interruption. These events are defined in accordance with the
QNA-P/PV
setup.
The type of event also identifies the phase where this event ocurred.
Duration of the event:
Period of time in milliseconds that the event lasted.
Maximum/minimum voltage for the event:
In the event of an interruption or
voltage dip, the minimum RMS½ (*) voltage value obtained during the event. In the
event of a voltage swell, the maximum values will be recorded.
Average voltage for the event:
The average RMS½ (*)voltage value during
the event.
Voltage prior to the event:
The RMS½ (*) voltage value before the event
occurrence is recorded.
(*) RMS ½ value: RMS value of a complete cycle, refreshed every semi-cycle.
Содержание Q20711
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