SIEMENS
Engineering information
SINAMICS GM150, SINAMICS SM150
Power cables
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Siemens D 12 · 2012
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Configuration
Basic information
The cable selection and cable dimensioning depend on various
factors (e.g. temperature, routing type, cable type, EMC require-
ments, local regulations).
This is the reason that it should be noted that the following data
represent recommendations only. The system integrator is
responsible for dimensioning the cables.
Motor cables
If the SINAMICS GM150 and SINAMICS SM150 converters are
operated without sine-wave filters, higher voltages arise on the
motor terminals and hence on the cable due to the switching
edges. Suitable cables must be selected, therefore. to meet the
EMC and voltage endurance requirements. Different technical
characteristics result in differences between the converters with
IGBT power units and those with IGCT power units.
The correct cable cross-section depends not only on the motor
current but also on the number of cables which are routed in
parallel, the routing conditions and the ambient temperature. It
must be determined for each individual case. Local installation
regulations must be observed in addition.
A finely-stranded cable for equipotential bonding between the
motor and converter should be installed parallel to the power
cables. Local regulations must be observed in this case, too.
SINAMICS GM150 in the IGBT version and SINAMICS SM150
in the IGBT version (without sine-wave filter)
Shielded three-core medium-voltage cables must be used to
connect the converter to the motor. For converters with an output
voltage of 2.3
kV, cables for a minimum of 3.6/6
kV are adequate.
For converters with output voltages of 3.3
kV and 4.16
kV, cables
for a minimum of 6/10 kV are required. Symmetrical cables with
individually shielded copper conductors are recommended. An
additional common outer shield is an advantage for improving
the EMC characteristics. The cable capacitances must not
exceed the following values.
Single-core, shielded cables are permissible if three cables are
routed in a triangular arrangement without clearance between
the cables as cable bundle on the cable tray. The symmetrically
arranged cable bundle comprises one cable for every phase
(three-phase system). The cable bundles are arranged next to
one another on the cable tray. The clearance between them
corresponds to twice the outer diameter of a single-core cable.
The cable bundles have alternating rotating fields – clockwise
and counter-clockwise.
EMC-FC (Frequency Converter) cables should be used for
increased requirements regarding EMC. Their EMC-optimized
cable design reduces the radio interference radiation and radio
interference voltage when compared to standard medium-
voltage cables.
SINAMICS GM150 in the IGBT version and SINAMICS SM150
in the IGBT version (with sine-wave filter)
For operation with a sine-wave filter there are no special require-
ments to be met by the cables from the converter to the motor.
When using unshielded medium-voltage cables, some type of
cable armor is recommended in order to ensure the mechanical
ruggedness of the cables. For a rated motor voltage of 3.3 kV
and lower, the rated cable voltage is 3.6/6 kV. For a rated motor
voltage above 3.3 kV, the rated cable voltage is 6/10 kV.
SINAMICS GM150 in IGCT version and SINAMICS SM150
in IGCT version
Shielded three-core medium-voltage cables for 6/10 kV must
be used to connect the converter to the motor. Symmetrical
cables with individually shielded copper conductors are recom-
mended. An additional common outer shield is an advantage for
improving the EMC characteristics.
Single-core, shielded cables are permissible if three cables are
routed in a triangular arrangement without clearance between
the cables as cable bundle on the cable tray. The symmetrically
arranged cable bundle comprises one cable for every phase
(three-phase system). The cable bundles are arranged next to
one another on the cable tray. The clearance between them
corresponds to twice the outer diameter of a single-core cable.
The cable bundles have alternating rotating fields – clockwise
and counter-clockwise.
EMC-FC (Frequency Converter) cables should be used for
increased requirements regarding EMC. Their EMC-optimized
cable design reduces the radio interference radiation and radio
interference voltage when compared to standard medium-
voltage cables.
Cables between the transformer and the converter
The same instructions apply as in the case of the motor cables.
Cable cross-section
Cable capacitance
3 × 240 mm
2
0.6
µ
F/km
3 × 95 ... 185 mm
2
0.5
µ
F/km
3 × 70 mm
2
0.4
µ
F/km
© Siemens AG 2012