Siemens SINAMICS S120 Combi User Manual page 53

Example 2
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%.
Example 3
If S
u matching transformer = 3 %
k
S
K plant
S
K line
according to a)
S
n1
According to b)
S
n2
The matching transformer requires a rated power S
of 3%.
SINAMICS S120 Combi
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
= 50000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
> S ⇒ S is decisive
n2 n1
is lower, then a higher-rating transformer must be used.
K plant
= 3000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
> S ⇒ S is decisive
n1 n2
Line-side power components
2.8 Line connection versions
of 21 kVA for a short-circuit voltage u
n
of 34 kVA for a short-circuit voltage uk
n
k
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