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Resin: also with oval section




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Shapes are changing and performances are improving

A typical cast resin transformer is designed with a magnetic core and circular section. All transformers manufacturers know that the circular section can become both oval, by lengthening the central step, and rectangular if the core has a single step.

Low voltage VPI transformers are almost exclusively produced with a rectangular section. Oil transformers can, however, come in various shapes: a section with a rectangular core for small power, oval for distribution up to 3150kVA and circular for special or high-powered transformers. The typical shape of the core section for resin transformers is always circular with the exception of the amorphous transformer, for which the best shape is oval for construction reasons bound by only three types of tape. To this end, in the last four years GBE has invested heavily in the amorphous transformer and even though this technology is now no longer a source of interest due to the ECO directive, the construction features and design studied algorithms helped us to develop and fine-tune a new range of cast resin transformers: the oval series.

This type of transformer had already been developed in 2012, but its potential has only been fully recognised over the last few years. The ECO directive has resulted in the need to drastically reduce core losses and reduce them even further from 2021 onwards. To guarantee the figures promised, the best solution to adopt is to use magnetic material with reduced losses, therefore, lasered magnetic steel sheet with a lighter core with the same section. Thanks to the oval core, this last feature is guaranteed because the length of the magnetic circuit is decreased, the weight is reduced and consequently, the losses.

GBE has developed a complete range of cast resin transformers in class 12kV and 24kV Eco Tier1 and Eco Tier2. This new transformer design is more compact, weighs less and the standards and required performances are guaranteed without sacrificing the results offered by the series with a circular section.
To produce this new type of product, GBE’s research and development department has once again adopted a series of stand-out construction features to differentiate us from our competitors, confirming our role as “specialists in special transformers”.


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