Siemens 6SL3120-2TE21-0AA3

Line connection and line-side power components
3.11 Line connection variants
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
145
Rated power of the used
Active Module P
n
Required rated power of the
isolating transformer /
autotransformer
S
n
(1.27 • P
n
)
Required short-circuit
voltage U
k
Minimum system fault level
required
S
Kline
(70 • P
n
)
Rated power of the used
Basic Line Module P
n
Required rated power of the
isolating transformer /
autotransformer
S
n
(1.27 • P
n
)
Required short-circuit
voltage U
k
Minimum system fault level
required
S
Kline
(30 • P
n
)
20 kW
≥ 26 kVA
≤ 10 %
≥ 0.6 MVA
40 kW
≥ 51 kVA
≤ 10 %
≥ 1.2 MVA
100 kW
≥ 127 kVA
≤ 10 %
≥ 3.0 MVA
Note
Ask your local power utility company for the short
-circuit power at the plant connection S
K
plant
.
Example 1
u
k
matching transformer = 3%,
S
K plant
= 50,000 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)
S
n2
> S
n1
⇒ S
n2
is decisive.
The matching transformer requires a rated power S
n
of 25 kVA for a short-circuit voltage u
k
of 3%.
Example 2:
u
k
matching transformer = 1%,
S
K plant
= 50,000 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)
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