Line Harmonics Filter; Line Filters - Siemens SINAMICS G130 Engineering Manual

In this case, the short-circuit power S
S
Transf
=
S
k 1
S
Transf
+
v
k Transf
S
k 2 Line
Abbreviation Meaning
S Rated apparent power of the transformer
Transf
v Relative short-circuit voltage of the transformer
k Transf
S Short-circuit power of the higher voltage level
k2 Line
Line reactors must always be provided if more than one rectifier is connected to the same point of common coupling.
In this instance, the reactors perform two functions, i.e. they smooth the line current and decouple the rectifiers at the
line side. This decoupling is essential in ensuring fault-free operation of the rectifier circuit. For this reason, each
rectifier must be provided with its own line reactor, i.e. it is not permissible for more than one rectifier to be connected
to the same line reactor.
Another constellation which requires the use of line reactors is the parallel connection of rectifiers where these are
connected to a common power supply point. This usually applies to 6-pulse connections. The line reactors provide for
balanced current distribution and ensure that no individual rectifier is overloaded by excessive current imbalances.
7.3.2.7

Line Harmonics Filter

Line Harmonics Filters for reducing harmonic effects on the supply system are not included in the liquid-cooled
SINAMICS S120 Cabinet Modules product range.
To reduce harmonic effects on the supply system, 12-pulse connections with a three-winding transformer or Active
Infeeds with the SINAMICS S120 Active Infeed must be used.
7.3.2.8

Line filters

The Infeeds in the SINAMICS S120 Cabinet Modules range are equipped as standard with an integrated line filter for
limiting conducted interference emissions in accordance with EMC product standard EN 61800-3, category C3
(applications in industrial areas or in the "second" environment). This standard line filter is installed in the Basic Line
Module for the Basic Line Connection Module and in the Active Interface Module for the Active Line Connection
Module.
The maximum permissible motor cable lengths for the different SINAMICS S120 Infeeds which ensure compliance
with the interference voltage limits defined for the above categories can be found in section "Line filters (radio
frequency interference (RFI) suppression filter or EMC filter)" of chapter "Fundamental Principles and System
Description".
To ensure that the converters comply with the tolerance limits defined for the above categories, it is absolutely
essential that the relevant installation guidelines are followed. The efficiency of the filters can be guaranteed only if
the drive is properly installed, i.e. if it is correctly grounded and shielded. For further details, please refer to section
"Line filters (radio frequency interference (RFI) suppression filter or EMC filter)" in chapter "Fundamental Principles
and System Description" and to chapter "EMC Installation Guideline".
Line filters can be used only for SINAMICS S120 Cabinet Modules that are connected to grounded supply systems
(TN or TT with grounded neutral). On converters connected to non-grounded systems (IT systems), the standard
integrated line filter must be isolated from PE potential. This is done by removing the appropriate metal clip when the
drive is commissioned (see operating instructions).
Note:
Although the Infeeds of the air-cooled S120 Cabinet Modules can be optionally equipped with an additional line filter
(option L00) in order to limit conducted interference emissions in accordance with EMC product standard
EN 61800-3, category C2, this is not currently possible for liquid-cooled S120 Cabinet Modules.
SINAMICS S120 Cabinet Modules
at the PCC of the Basic Line Connection Module is approximately:
k1
SINAMICS Engineering Manual – November 2015
Engineering Information
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