UNIPOWER
UP-2210R/P Hardware installation and configuration manual
73
E.
Slowscan Settings
Slowscan is an optional module. Slowscan recording is often used to verify longer disturbances in
the electrical network. The type of disturbance could be caused by instability or other major events
that influence the network.
During a slowscan recording the RMS values of the parameters are stored with a resolution of 10-
100 samples per second.
Since the resolution is lower a longer recording can be made. Maximum pre trig is 30 seconds and
maximum recording length (including pre trig) is 300 seconds. For typical grid operations Unipower
recommends a configuration of 10 seconds pre trig, 120 seconds post trig. Note that appropriate
settings might take some trial and error before you find optimal storage length for your system. If
you wish you can configure the meter to automatically stop recording when values are within the
limits again.
Slowscan may be set to trig on either Voltage and Current, system Frequency and active/reactive
Power:
With voltage you may set the trig to occur on a percentage deviation from the nominal.
Current trig will let you trig on the rate of change expressed in kilo-amps per 100 milli-seconds.
The frequency trig will trig on both percentage of nominal frequency as well as frequency derivative
Hz/100milli-seconds.
The power trig will trig on rate of change power MW/second and MVAr/second
Figure 77
