Reactive Power; Emc - ABB PQFA Instruction Manual

PQFA Instructions Manual
Besides the harmonic selection functionality, the user has also the possibility
to specify a filtration level for each selected harmonic. The PQFA will filter the
selected harmonics until
by the user and may be different for each selected harmonic. This
functionality is especially useful when the objective is to fulfil the requirements
of a standard and results in a better use of the available compensation power.
It also allows the installation of active filters on networks already fitted with a
fixed passive filter.
We can see that we are very close to the ideal filter: the choice of which
harmonic components to filter is free and the degree of filtering is adjustable
according to the wishes of the user.
Moreover, all typical harmonics generated by three-phase non-linear loads
may be filtered simultaneously.

3.4.2. Reactive power

Besides the filtering functionality, reactive power compensation is also
possible with the active filter. Compared to traditional capacitor banks, the
reactive compensation of the PQFA is continuous (' stepless' ), fast and
smooth (no transients at switching). The compensation can be either
capacitive or inductive.
Two types of compensation are available: automatic compensation where a
target power factor has to be set, and fixed compensation based on a
predefined amount of kvar.

3.4.3. EMC

The PQFA has been verified for compliance with EU (European Union)
directives for EMC (electromagnetic compatibility) for operation at 50 Hz and
bears the CE-mark to this effect.
When an apparatus is used in a system, EU directives may require that the
system is verified for EMC compliance.
Asea Brown Boveri Jumet S.A.
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