Manual Power Quality Filter PQFM The PQF-Manager user interface 115
Figure 83 illustrates the principle of filtering to curve for one particular harmonic order.
The flexibility of the PQF control is such that a specific curve level may be defined for
each selected harmonic.
Filtered current
Remaining
supply
current
Before filtering After filtering
Permitted
residual level
into the supply
=
curve setting
Figure 83: Filtering to curve for harmonic order n
The default filter mode is Mode 3.
7.9.1.1.2Selecting the harmonics with setting of curve levels
For setting up the filter’s main harmonics selection go to
[/Welcome/Settings/Customer set./Main settings/Main harmonics]
For setting up the filter’s auxiliary harmonics selection go to
[/Welcome/Settings/Customer set./Auxiliary settings/Aux. harmonics]
The harmonics that can be selected are presented in a table such as presented in Table
46.
When the PQF is operating in 4-W mode, 15 harmonics can be selected.
When the PQF is operating in 3-W mode, 20 harmonics can be selected.
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