e.g. Blocking Reactor: Blocking
Reactor sometimes called as re-tuned filter or
low pass filter. Harmonic currents generated by,
for example, a frequency converter are shunted
by this circuit designed to have low impedance at
a given frequency compared to the rest of the
network. The main function of this is to protect
the capacitor unit firm being exploited by the
excessive level of power harmonics in electric
network. Although passive filters are cost
effective there are some disadvantages like they
provide certain amount of reactive power which
is not desirable when the loads to be
compensated are ac drives which already have a
good power factor they are susceptible to
overload, sensitive to frequency changes and