| |
|
Harmonic
Filter Solutions:
The use of a passive harmonics
filter on the input side of
harmonics-generating loads (such
as variable speed drives) can
prevent the above problems by
effectively minimising harmonics
in a very cost effective and
easy to apply way. The MTE
Matrix D Series of harmonics
filters can be supplied for both
415 volt and 690 volt 50 Hz
supply systems and with current
ratings up to 1,600 amps.
DC link
Chokes
When added between the input
rectifier and bus capacitor the link
choke will improve the DC bus
waveform and the AC input waveform.
In this location the DC reactor will
reduce the amount of AC ripple on
the DC bus, reduce the AC input line
harmonics and offer protection
against nuisance tripping due to
voltage spikes such as those caused
by capacitor switching. However, a
DC link choke, will not offer
protection of the input rectifiers.
DC link chokes offer the advantage
of maximizing the circuit inductance
for power quality reasons, but
without causing an AC input line
voltage drop. DC link chokes can be
used individually, typically on the
positive DC bus, or in pairs with
one each on both the positive and
negative bus. When two DC reactors
are used on the bus, the inductance
is additive.
|
