SAFACTIVE FILTER - COMAR CONDENSATORI SpA

So:
‣ it recognizes and compensates all the current up to the 50 th harmonic order
‣ it has excellent dynamic response to fast load variation
‣ it compensates if network features change due to new machinery or equipment in the installation
‣ it is impossible to overload
‣ it’s easy to size
‣ every module is easily connected
‣ it fits every kind of load so it will not be obsolete
These good performance of SAF, with the possibility to connect it to existing an installation and its
modular design allows the filter to give the right solution for every problem with harmonic pollution,
in every kind of condition.
Current from a non linear load (top)
and his relative filtered current (bottom)
Operating mode
The active filter is based on “compensation”, that means that in order to eliminate in a three phase
system the harmonic current absorbed by the non linear load, the filter from the current of the load,
calculates and injects the same harmonics (over the fundamental) shifted by 180 degrees. It results in a
complete elimination from the installation of the dangerous component of the current.
Figure 1
LOAD
Active Filter operation scheme
At the same way it is possible to have a power factor correction of the load, producing three sinusoidal shaped
current waveforms, with an amplitude in line with the load.
In order to understand how SAF operates, look at the picture below there are three different blocks, each one
showing different operating stages of the Active Filter:
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