Siemens SINAMICS S120 - Page 143

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