Siemens SINAMICS G130 Engineering Manual page 85

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When using 6-pulse rectifier circuits (G130, G150, S120 Basic Line Modules and S120 Smart Line Modules), the
limits can generally be maintained only if a very low percentage of the total transformer load is made up of
converter load. Typical constellations with 6-pulse rectifiers cannot maintain the limits due to excessive harmonic
currents with harmonic numbers 5, 7, 11 and 13.
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When using 6-pulse rectifier circuits (G130, G150) with Line Harmonics Filters (LHF or LHF compact), the limits
can always be maintained.
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When using 12-pulse rectifier circuits (G150 in the higher power range with two parallel connected converters,
S120 Basic Line Modules or S120 Smart Line Modules supplied by a three-winding transformer) the limits can
only be maintained with a relatively strong supply and, correspondingly, a large relative short-circuit power.
Configurations with 12-pulse rectifier circuits connected to weak supplies with small relative short-circuit power
do not maintain the limits due to high harmonic currents with the harmonic numbers 11 and 13.
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When self-commutated IGBT rectifiers / regenerative units (S150, S120 Active Line Modules) are used, the limits
can always be maintained.
If 6-pulse rectifier circuits without Line Harmonics Filters or 12-pulse rectifier circuits are used, an exact calculation of
the harmonic effects on the supply should always be performed with the supplementary conditions of the individual
plant configuration.
Fundamental Principles and System Description
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