Siemens 6SL3845-2NN41-8AD2 Operating Instructions Manual page 38

Description
3.5 Description of the components
Consider the following properties during the configuration:
● Short-circuit voltage u
● Transformer taps for voltage adjustments:
● The voltages and insulation for the secondary-side windings must be dimensioned as
Connection
Circuit version
Infeed transformers
Recommended vector group
Drive output voltage
[kV]
3.3
The specified voltage is the required impulse withstand / test voltage for the transformer
1)
secondary windings with respect to ground. Because the transformers generally have
temperature evaluation systems in the windings, the specified test voltage is required for
strengthened insulation. If no control circuits have been installed in the windings, the test
voltage in accordance with the basic insulation is sufficient.
Basic connection
2)
Option
3)
A two-winding transformer is required for each Active Line Module. When two complete drive
units are connected in parallel, a three-winding transformer with shifted windings can be used
for suppressing line harmonics.
Consider the following properties during the configuration:
● Transformer secondary voltage: 3.3 kV
● Minimum leakage inductance: 1 mH
● Transformer taps for voltage adjustments: 2 x ± 2.5
38
k
2 x 2.5%.
The winding transformer taps are normally located on the primary side of the transformer.
shown in the following table:
Test voltage
[kV]
33.6
u
(short-circuit voltage
This value includes all the inductance between the line and the converter: Line short-circuit
inductance, transformer inductance, reactor inductance.
The winding taps are usually located on the high voltage side of the transformer.
≥ 10% (in relation to 10 MVA)
Basic connection, 12-pulse infeed Series connection of the Basic Line
1 three-winding transformer
Dy5 Dd0
1)
2 x 1.7
=15% to 28% depending on transformer output)
k
Single connection
Module
2 three-winding transformers
Dy5 Dd0
with primary shift + 7.5°
Dy5 Dd0
with primary shift - 7.5°
Transformer secondary voltage
(no-load voltage)
[kV]
2 x 0.85 (2x)
2)
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE
3)