Siemens SINAMICS S120 Manual page 143

The required rated power of the matching transformer can be calculated with the following
formula.
Note:
The short-circuit power at the plant connection S
the matching transformer.
From the rated power (S
for the matching transformer.
Table 3- 32 Engineering information for transformers for Active Line Modules
Rated power P
n
16 kW
36 kW
55 kW
80 kW
120 kW
Table 3- 33 Engineering information for transformers for Smart Line Modules
Rated power P
n
5 kW
10 kW
16 kW
36 kW
55 kW
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
or S ) calculated under a) and b), the higher value must be used
n1 n2
Required rated power of the
isolating transformer / auto-
transformer
S (1.27 • P )
n n
≥ 21 kVA
≥ 46 kVA
≥ 70 kVA
≥ 102 kVA
≥ 153 kVA
Required rated power of the
isolating transformer / auto-
transformer
S (1.27 • P )
n n
≥ 6.4 kVA
≥ 13 kVA
≥ 21 kVA
≥ 46 kVA
≥ 70 kVA
Line connection and line-side power components
plays a decisive role in dimensioning
K factory
Required short-circuit volt-
age U
k
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
Required short-circuit volt-
age U
k
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
3.11 Line connection variants
Minimum system fault level
required
S (70 • P )
K line n
≥ 1.12 MVA
≥ 2.52 MVA
≥ 3.85 MVA
≥ 5.6 MVA
≥ 8.4 MVA
Minimum system fault level
required
S (70 • P )
K line n
≥ 0.35 MVA
≥ 0.7 MVA
≥ 1.12 MVA
≥ 2.52 MVA
≥ 3.85 MVA
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