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Preparations for use
4.1 Notes for system integrators
Depending on the application and the type of static excitation equipment used, line-side
components such as a transformer or line reactors may be required for excitation purposes if
their monitoring and control functions are not provided by the converter.
Note
The premagnetization of the converter transformer is not part of the converter.
See also
Dry transformer monitoring (option A72) (Page 43)
Oil transformer monitoring (option A73) (Page 43)
4.1.2
Selection and configuration of multi-winding transformers
Multi-winding transformers supply converters which are connected separately, in parallel, or in
series. In general, transformers are configured for a line voltage range of ±5% in accordance with
IEC 60076-1 (they may be configured differently on request).
Coupling factor
Each converter causes current harmonics as a result of non-sinusoidal input currents and
commutation processes. These current harmonics distort the voltage, which results in a
deformation of the supply voltage for subsequent windings. This can cause a malfunction in the
case of controlled line-side converters. In critical cases, ensure that the degree of coupling is less
than 10 to 15% and that the degree of decoupling is between 85 and 90%.
Design of the transformer winding
①
Figure 4-1
60
Core
Two-tier design
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
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