SGB - Auto Transformers
From Large Power Transformers up to 800KV
At higher voltages, large auto-transformers are used to interconnect the 400kV-500kV systems with either the 230kV-275kV systems or 120kV-145kV systems (the exact values depend on the country being considered). The HV and MV windings in an auto-transformer are connected together unlike in other transformers. The result is that the MV winding (common winding) is shared between the MV and HV systems. This results in a smaller and less expensive transformer than if the windings were separated as in a conventional fully rated two winding transformer.
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Products Details
However, this is only advantageous if relatively close voltage ratios are used. A separate delta connected tertiary winding may be provided for harmonic suppression or for the supply of local loads at lower voltages.
These auto-transformers are generally more complex than generator step-up transformers and their dielectric design more difficult. Their performance under short-circuit has also to be carefully analysed at the design stage, as they are connected to large systems with high short circuit fault capacities capable of the bulk infeed of fault current during a short circuit on the external system.
Technical Information
Royal SMIT Transformers B.V. has an ongoing engineering evaluation process for continuous improvement and upgrade of its design programs.
Royal SMIT engineering is making full use of a high end 3D-CAD system for the complete transformer design. Active parts and tanks can be combined in one model allowing the best possible check on correct dimensioning.
Almost all engineers use 3D-CAD stations. The introduction of 3D-CAD technology was thoroughly prepared over the past years. A team of experts worked fulltime on the required tank- and active part models.
The great advantages for SMIT as well as its customers are:
- constant quality because of modular design
- large reduction of engineering time for standardised transformer designs
- reduced engineering lead time for even the most complicated transformers
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