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

A line reactor can only be dispensed with when the RSC value for relative short-circuit power is less than stated in
the above table. This applies, for example, if the converter is connected to the supply via a transformer with specially
adapted rating and none of the other reasons stated above for using a line reactor is valid.
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 converter is connected to the same point of common
coupling. In this case, 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 converter must be provided with its own line reactor, i.e. it is not permissible for more than one converter to be
connected to the same line reactor.
A line reactor is also essential for any converter that is to be equipped with a line filter for RI suppression or with a
Line Harmonics Filter (LHF) for reducing harmonic effects on the supply. This is because filters of this type cannot be
100% effective without a line reactor (does not apply to Line Harmonics Filter LHF compact).
4.8.3

Line Harmonics Filters

Line Harmonics Filters reduce the low-frequency harmonic effects on the supply system created by the converter to
levels which could otherwise only be achieved with 12-pulse rectifiers, allowing compliance with the strict limit values
defined in standard IEEE 519.
Further information about the operating principle of the filters and applicable supplementary conditions can be found
in section "Line Harmonics Filters (LHF and LHF compact)" in chapter "Fundamental Principles and System
Description".
4.8.4

Line filters

SINAMICS G130 converter Chassis units 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, for motor cable lengths
of up to 100 m (applications in industrial areas or in the "second" environment).
An optional line filter is also available as a system component which renders the converters with motor cable lengths
up to 100 m suitable for category C2 applications in accordance with product standard EN 61800-3 (installation in
residential areas or in the "first" environment).
To ensure that the converters comply with the limits defined for the above categories, it is absolutely essential that
the relevant installation guidelines are followed. The efficiency of the filters as regards grounding and shielding can
be guaranteed only if the drive is properly installed.
Line filters can be used only on converters that are connected to grounded supply systems (TN or TT with grounded
neutral). On converters connected to non-grounded systems (IT supply systems), the standard integrated line filter must be
isolated from PE potential. This can be done simply by removing a metal clip on the filter when the drive is commissioned
(see operating instructions). It is not possible to use the optional line filter available as system component in non-grounded
systems to achieve compliance with the limits defined for category C2 by EMC product standard EN 61800-3.
For further details, please refer to section "Line filters" in chapter "Fundamental Principles and Description" and to
chapter "EMC Installation Guideline".
at the PCC of the converter is approximately
k1
SINAMICS Engineering Manual – November 2015
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