Siemens SINAMICS G130 Engineering Manual page 53

Fundamental Principles and System Description
Engineering Information
The relative short circuit power RSC of the supply system must have a value of at least 10. If the short circuit power
is any smaller, the line-side resonance frequency will be affected too much and the fundamental wave of the line
voltage may increase considerably until it reaches values beyond the permissible line voltage tolerance of the
converter.
Line-side fuse protection for the Line Harmonics Filters should be implemented using the same fuse types as those
recommended in catalog D11 as line-side power components for protecting the corresponding converters.
If line-side switches or contactors are used for switching on/off a Line Harmonics Filter, these must be dimensioned
for the making current involved, which is in the same order of magnitude as the rated current. For this reason, AC-3
category contactors must be used.
The converter-side main contactor or the converter-side circuit breaker must not connect the converter to the filter,
before the filter is connected to the supply. When shutting down the system, the converter must always be
disconnected from the filter by means of the main contactor or the circuit breaker, before the filter is disconnected
from the supply.
Line Harmonics Filters can be connected in parallel in order to increase the power. A current derating of 7.5 % must
be taken into consideration.
Line Harmonics Filters LHF can also be used with G150 parallel converters (G150 power extension), if a 6-pulse
power supply is given and both partial converters are fed from the same supply resp. the same transformer winding.
In this case, each partial converter must be connected to a Line Harmonics Filter on the line side, which is adapted to
the power of the partial converter.
With a 12-pulse line connection, the use of a Line Harmonics Filter does not make technical sense because no
additional improvement of the harmonic effects will be achieved.
Line Harmonics Filter LHF can be operated on both 50 Hz and 60 Hz supply systems. The supply frequency is
selected through reconnection of jumper links in the filter at the commissioning stage. The supply frequency is set for
50 Hz in the delivery state (factory setting).
Line Harmonics Filters LHF can be used in grounded (TN/TT) and non-grounded (IT) supply systems.
Line Harmonics Filter LHF must be sited close to the converter. The length of cable between the Line Harmonics
Filter LHF and the converter input should not exceed 10 m.
SINAMICS Engineering Manual - May 2008
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