Siemens SINAMICS S120 Combi User Manual page 54

Line-side power components
2.8 Line connection versions
Example 4
If S
u matching transformer = 1 %,
k
S
K plant
S
K line
according to a)
S
n1
According to b)
S
n1
The matching transformer requires a rated power S
of 1%.
Note
S
n2
above, the power drawn from other loads has not been taken into account.
52
is lower, you can use, alternatively to example 3, a transformer with a lower u
K plant
= 3,000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
> S ⇒ S is decisive
n2 n1
for the matching transformer can be reduced by reducing u
of 21 kVA for a short-circuit voltage u
n
. In the examples listed
k
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
.
k
k
SINAMICS S120 Combi