SIEMENS
Engineering information
SINAMICS GM150, SINAMICS SM150
Transformers
9/12
Siemens D 12 · 2012
9
■
Configuration
SINAMICS SM150
Transformer secondary voltage (phase-to-phase, line to line):
•
SINAMICS SM150 in the IGCT version: 3.3 kV
•
SINAMICS SM150 in the IGBT version: 3.3 kV or 4.16 kV
If the converter is also to provide capacitive reactive power
(a noticeable amount) to compensate for other inductive loads
connected to the line supply, then the secondary no-load volt-
age of the transformer must be dimensioned lower, in order that
the converter voltage of 3.3 kV or 4.16 kV is sufficient. As a con-
sequence, the maximum power that can be transferred is re-
duced. For extremely high surge power levels, the secondary
no-load voltage must also be dimensioned somewhat lower.
Transformer leakage reactances
The minimum required protection values for the leakage reac-
tance of the various converter types can be found in the follow-
ing table. These values include all the inductances between the
line supply and converter Line short-circuit inductance, trans-
former inductance, reactor inductance.
Transformer minimum leakage reactances (short-circuit impedance of
the line supply of 1 % taken into account)
Transformer short-circuit voltage
The required relative short-circuit voltage
u
K
(for each second-
ary winding) depends on – for the selected leakage reactance
X
S
(see table)
– the rated apparent power of the transformer
S
NTrans
(for each secondary winding) and can be defined using
the following formula:
u
K
=
X
S
×
S
NTrans
/ (
V
sec
)
2
X
S
in
Ω
S
NTrans
in MVA
V
sec
in kV
Taps for adjusting the voltage
The winding taps are usually located on the high voltage side
of the transformer.
SINAMICS GM150
Recommended taps for the voltage adjustments:
2 × ±2.5 % or ±5 % for operation with a sine-wave filter
SINAMICS SM150
Recommended taps for the voltage adjustment:
2 × ±2.5 %
Converter
Transformer
Version
Rated output
voltage
Secondary
voltage per
winding system
V
sec
Minimum
leakage
reactance
X
S,min
1)
kV
kV
Ω
SINAMICS GM150
IGBT
2.3
1.2
0.068
3.3
1.7
0.101
4.16
2.2
0.143
IGCT
3.3
1.7
0.058
0.85
2)
0.029
2)
SINAMICS SM150
IGBT
3.3
3.3
0.314
IGCT
3.3
3.3
0.179
1)
The corresponding minimum leakage inductances
L
S,min
can be
calculated using the following formula:
X
S,min
= 2
π
×
f
Nline
×
L
S,min
(with
f
Nline
= line frequency).
2)
Option
N15
.
© Siemens AG 2012