Siemens Sinamics S120 Manual page 146

Line connection and line-side power components
3.11 Line connection variants
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%.
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
power drawn from other loads has not been taken into account.
146
> S ⇒ S is decisive.
n2 n1
is smaller, the transformer must be stronger.
K plant
= 3,000 kVA
= 16 kW • 70 • 0.73 = 820 kVA
= 1.27 • 16 kW = 21 kVA
> S ⇒ S is decisive
n1 n2
is smaller, you can use, alternatively to example 3, a transformer with a smaller 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
of 34 kVA for a short-circuit voltage u
n
of 21 kVA for a short-circuit voltage u
n
. In the examples above, the
k
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
k
k
.
k
k
Booksize Power Units