Siemens Sinamics S120 Manual page 144

Line connection and line-side power components
3.11 Line connection variants
Special case:
When operating with only one supply at a transformer, the values may be reduced by the
factor 0.73.
S
K line
S
K line
For example S
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- 29 Transformer configuration instructions
Rated power of the used
Active Module P
n
16 kW
36 kW
55 kW
80 kW
120 kW
Rated power of the used
Smart Line Module P
n
5 kW
10 kW
16 kW
36 kW
55 kW
144
≥ 0.73 • 70 • P (for Active Line Module and Smart Line Module)
n
≥ 0.73 • 30 • P (for Basic Line Module)
n
for 16 kW Active Line Module: S
K line
or S
n1
Required rated power of the
isolating transformer /
autotransformer
S (1.27 • P )
n n
≥ 21 kVA
≥ 46 kVA
≥ 70 kVA
≥ 102 kVA
≥ 153 kVA
Required rated power of the
isolating transformer /
autotransformer
S (1.27 • P )
n n
≥ 6.4 kVA
≥ 13 kVA
≥ 21 kVA
≥ 46 kVA
≥ 70 kVA
K line
K plant
) calculated under a) and b), the higher value must be used
n2
Required short-circuit
voltage U
k
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
Required short-circuit
voltage U
k
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
≤ 3 %
= 0.82 MVA = 820 kVA
plays a decisive role in dimensioning
Minimum system fault level
required
S (70 • P
Kline
≥ 1.12 MVA
≥ 2.52 MVA
≥ 3.85 MVA
≥ 5.6 MVA
≥ 8.4 MVA
Minimum system fault level
required S
Kline
≥ 0.35 MVA
≥ 0.7 MVA
≥ 1.12 MVA
≥ 2.52 MVA
≥ 3.85 MVA
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
)
n
(70 • P )
n