6-Pulse Operation Of Sinamics G150 Parallel Converters - Siemens SINAMICS G130 Engineering Manual

6-pulse operation of SINAMICS G150 parallel converters

a) 6-pulse operation of G150 parallel converters with production date up to autumn 2007
At 6-pulse operation, both rectifiers are connected to the same secondary winding of a two-winding transformer or to
a common infeed point, as illustrated in the following diagram.
6-pulse operation of SINAMICS G150 parallel converters with production date up to autumn 2007
With the gating impuls generator for the thyristors implemented in the rectifiers of SINAMICS G150 parallel
converters supplied up to autumn 2007, a correct 6-pulse operation can only be guaranteed when the following
supplementary conditions are met:
•
The DC links of both partial converters units must not be connected to each another, which is the
delivery state of the factory.
•
The unit must only be connected to motors with two electrically isolated winding systems.
As the line-side rectifiers have no electronic current sharing control, the line-side currents must be balanced by the
following measures:
•
Use of line reactors with a relative short-circuit voltage of uk = 2 %. The omission of the line
reactors by chosing option L22 is not permissible.
•
Use of symmetrical power cabling between the line connection point and the parallel-connected
rectifiers (cables of identical type with the same cross-section and length)
The motor-side limitations and restrictions with respect to the operation of motors with electrically isolated winding
systems are described on the following pages in the section "Operation of G150 parallel converters at motors with
two electrically isolated winding systems".
Engineering Information
SINAMICS Engineering Manual - May 2008
© Siemens AG
SINAMICS G150
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