UNIPOWER
UP-2210R/P Hardware installation and configuration manual
71
Sags/Swells events
The recorder can do a high-speed recording to allow detailed analysis of, for instance, a sag/swell
event. The storage time is the total recording length and is set so that the event you want to capture is
covered. A typical sag in the power distribution network is less than 1 second. The pre trig is a short
time that allows study of the time just before the event starts, the maximum pre trig is 10 seconds
with waveform enabled and 10 seconds with only RMS recording.
If waveform is not enabled, you will lose the ability to see disturbances in line-line/line-neutral
voltage. If waveform is enabled the meter stores the high-speed actual sample points. The number of
samples per cycle is selected in the properties. If waveform is not checked, only the RMS1/2-values
are stored, every half cycle. The RMS recording takes much less memory space and allows for
storing more events. With the auto stop function you can save memory. If the event goes back to
normal condition before the total storage time has passed, and this function is enabled, the recording
stops and memory space is saved. The delay before the stop is equal to the pre trig time.
To start the recording there are several different trigging methods.
Voltage triggers
a) U1-U3 trigs at deviation [% Uref]
Figure 76
