0DLQVXSSO\FDEOH
LQGXFWDQFH
&RQQHFWLRQSRLQWRI
WKHFRQYHUWHU
&RQYHUWHU
/LQHUHDFWRU
/LQH
6
NOLQH
Requirements for line reactors
Rated power of converter (kW)
Line reactor can be omitted for
R
SC
Line reactor is required for R
SC
315 ... 500
≤ 33
> 33
> 500
≤ 20
> 20
It is recommended that a line reactor is always connected on the line side of the converter, as
in practice, it is often not known on which supply configuration individual converters are to be
operated, i.e. which supply short-circuit power is present at the converter connection point.
A line reactor can only be dispensed with when the value for R
SC
is less than that in the above
table. This is the case, when the converter, as shown in the following figure, is connected to the
line through a transformer with the appropriate rating.
Note
A line reactor is always needed if a line filter is used.
0DLQVXSSO\FDEOH
LQGXFWDQFH
&RQQHFWLRQSRLQWRI
WKHWUDQVIRUPHU
&RQQHFWLRQSRLQWRI
WKHFRQYHUWHU
/LQH
&RQYHUWHU
6
NOLQH
6
N
6
WUDQVI
8
NWUDQVI
In this case, the line short-circuit power S
k1
at the connection point of the converter is
approximately:
S
k1
= S
transf
/ (U
k transf
+ S
transf
/ S
k2 line
)
S
transf
= Transformer rated power
S
k2 line
= Short-circuit power of the higher-level voltage level
U
k transf
= Relative short-circuit voltage
Description
2.6 Optional components
SINAMICS G120X converter
34
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
