Filter
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E-51028230XT/BG - 39
Harmonics filter and
power factor
improvement
This option, placed on the normal AC
input upstream of the UPS in the 1.9
meter high UPS cubicle for UPSs up to
120 kVA and in an auxiliary cubicle for
higher ratings, reduces the reinjection
of harmonic currents into the normal
AC source. Harmonic reinjection,
produced by the rectifier/charger,
increases distortion on the normal AC
source. The amount of the increase
depends on the source impedance.
The reduction in distortion reduces the
risk of disturbing other sensitive loads
connected to the mains. The filter can
also increase the power factor
upstream of the inverter.
Three types of filter are available:
◗ uncompensated filter for the
advantages listed above;
◗ compensated filter for the
advantages listed above and to limit the
capacitive current absorbed by the filter
(additional inductance), in the event the
UPS is supplied by an engine generator
set;
◗ active harmonic conditioner, the most
effective solution because it provides
the harmonics drawn, thus allowing the
normal AC source to supply a perfectly
sinusoidal current. The conditioner may
be installed in an auxiliary cubicle or
wall-mounted.
Isolating and voltage
matching transformer
for the normal and
bypass AC source and
the load
This transformer, placed in the 1.9
meter high UPS cubicle up to 60 kVA
and in an auxiliary cubicle for higher
values, may be used to match the
bypass AC voltage to that of the
inverter, to create galvanic insulation
between the load and the Ac sources or
to create the appropriate system
earthing arrangement.
Options
Safety of life and
property
◗ backfeed protection. This option,
installed upstream of the static bypass,
is used to mechanically disconnect the
bypass AC source when the system
has shifted to battery power or when
the bypass AC source has failed. This
system is intended to enhance the
safety of life and property.