Siemens SINAMICS S120 Combi Manual page 54

Line-side power components
3.8 Line connection versions
Example 2
u matching transformer = 1 %
k
S
K factory
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
K plant
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%.
Example 4
If S
K factory
u matching transformer = 1%,
k
S
K factory
S
K line
according to a)
S
n1
54
= 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.
= 3000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
> S ⇒ S is decisive
n1 n2
is lower, you can use, alternatively to example 3, a transformer with a lower u
= 3000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
of 21 kVA for a short-circuit voltage u
n
of 34 kVA for a short-circuit voltage uk
n
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7
k
.
k