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ANALYZER OF THE QUALITY OF ELECTRIC POWER SUPPLY
QNA-303 --
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6.1.5.- Quality parameters
•
% of voltage swell threshold:
The detection of a voltage swell depends on
the value set in this point (% of the rated voltage). Every semicycle whose
RMS value is over the defined limit value is stated to be a voltage swell. A
record will be saved into the event file (EVQ) every time this limit value is
exceeded, with the indication of the maximum voltage value detected, the
voltage average value and the duration of the voltage swell event.
•
Voltage swell hysteresis:
A voltage swell hysteresis value can be defined to
set a different value for the voltage swell event starting and ending point.
Thus, a voltage swell event starts when the voltage swell threshold is
exceeded, and ends when the voltage value is under the value defined by the
subtraction of the voltage swell hysteresis value from the voltage swell
threshold.
•
% of voltage dip threshold:
The detection of a voltage dip depends on the
value set in this point (% of the rated voltage). Every semicycle whose RMS
value is below the defined limit value is stated to be a voltage dip. A record will
be saved into the event file (EVQ) every time this limit value is exceeded, with
the indication of the minimum voltage value detected, the voltage average
value and the duration of the voltage dip event.
•
Voltage dip hysteresis:
A voltage dip hysteresis value can be defined to set
a different value for the voltage dip event starting and ending point. Thus, a
voltage dip event starts when the voltage dip threshold is not reached, and
ends when the voltage value is over the value defined by the addition of the
voltage dip hysteresis value to the voltage dip threshold.
•
% of interruption threshold:
The detection of an interruption depends on the
value set in this point (% of the rated voltage). Every semicycle whose RMS
value is below the defined limit value is stated to be an interruption. A record
will be saved into the event file (EVQ) every time this limit value is exceeded,
with the indication of the minimum voltage value detected, the voltage average
value and the duration of the interruption event.
