Line Connection Booksize
2.13 Line connection variants
Booksize power units
124 Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
Example 4
If S
K plant
is smaller, you can use, alternatively to example 3, a transformer with a smaller u
k
.
u
k
matching transformer = 1%,
S
K plant
= 3,000 kVA
S
K line
= 16 kW • 70 • 0.73 = 820 kVA
According to a)
S
n1
= 1.27 • 16 kW = 21 kVA
According to b)
N9$
N9$ವN9$ವ
N9$N9$ವ
6
Q
S
n1
> S
n2
⇒ S
n1
is decisive
The matching transformer requires a rated power S
n
of 21 kVA at a u
k
of 1%.
Note
S
n2
for the matching transformer can be reduced by reducing u
k
. In the examples above, the
power drawn from other loads has not been taken into account.
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