PQube User Manual 2.1
Page 53 of 113
minus the hysteresis setting (110% threshold – 2% hysteresis = 108% by default). You can change
the threshold for voltage swells by changing the settings in the [Phase_To_Neutral_Events] and
[Phase_To_Phase_Events] sections of the Setup.ini file on your SD card.
Voltage Interruptions
A voltage interruption occurs when all the line voltage goes away (such as when a breaker trips).
Your PQube records voltage interruptions according to IEC 61000-4-30 class A. An interruption
begins when the 1-cycle RMS of all voltage channels go below the threshold (10% of nominal by
default) and ends when any voltage is above the threshold, plus the hysteresis setting (10%
threshold + 2% hysteresis = 12% by default). You can change the threshold for voltage interruptions
by changing the settings in the [Phase_To_Neutral_Events] and [Phase_To_Phase_Events] sections of the
Setup.ini file on your SD card. Note that by definition, any voltage interruption is also a voltage dip,
so your PQube will record each voltage interruption as two overlapping events (a dip and an
interruption).
Frequency Variations
Your PQube records underfrequency and overfrequency events. Each type of event is triggered
when the frequency goes under a threshold (99.5% by default) or over a threshold (100.5% by
default), respectively. Underfrequency and overfrequency events end when the voltage frequency
approaches the nominal again. You can change the threshold for underfrequency and
overfrequency events by changing the settings in the [Frequency_Events] section of the Setup.ini file
on your SD card.
High Frequency Impulses
Your PQube includes special hardware used to detect high frequency impulses. These sensors
monitor L1-E, L2-E, L3-E and filter out everything but high frequency events. Your PQube will
detect an impulse with a ±450V (or more) peak that lasts for as little as 1 microsecond.
When your PQube detects a high frequency impulse it will make a standard event recording. Note
that the sampling rate of your PQube is 256 samples per cycle, so you may not see the impulse in
the recording, but the exact time of the impulse is marked and recorded.
Analog Dips and Swells
Your PQube includes two analog input channels called AN1 and AN2. You can set up a trigger to
record an event when your PQube detects a dip or a swell on AN1-Earth, AN2-Earth, or AN1-AN2.
You can enable these events and set the thresholds in the [AN1_E_Events], [AN2_E_Events], and
[AN1_AN2_Events] sections of the Setup.ini file on your PQube’s SD card.
If you enable these events, you will also want to enable the channel so that it is recorded in event
files. Enable the appropriate channels in the [Channels] section of the Setup.ini file on your
PQube’s SD card.
If you enable these events, be sure to set the dip and swell voltages carefully. It is important that
you not be “stuck” in an event, as this will prevent your PQube from writing updates about new
events. For example, if you connect AN1-Earth to a 24V nominal signal, but you set the swell
threshold to 20 volts, your PQube will start recording a swell immediately, but it will never finish
that event.
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