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Cast Resin Transformers have air and no fluid as a cooling medium. The high voltage coils are completely surrounded by cast resin with all manufacturers and are consequently protected. With SGB this process occurs even under vacuum so that even the smallest voids are eliminated in the resin, as sooner or later, this lead to malfunction. As the distances must be bigger with air than with oil cooling, cast resin transformers are generally bigger and, because of the large amount of material, they are also more expensive than oil transformers.
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So, why cast resin transformers then? Well the advantages speak for themselves:
Extremely high dependability:
SGB Cast Resin Transformers are a leading-edge product of German quality. This can be demonstrated in the extremely high dependability of the transformers.
Product quality
 High short time overload capability:
The time constant for heating the coil is bigger than with oil transformers. This is to be attributed to the lower current density and as a result to the greater mass. Short time load peaks, such as with wind power installations, can then be easily absorbed without there being a need to plan the relevant oversizing.
Overload capability
 Simple increased power:
Through an optimal forced ventilation with temperature-controlled fans installed below the winding and/or at the roof there is an increase in power of about 40%.
Ventilators
 Minimal fire risk:
The sole flammable mass-namely cast resin moulding material combined with glass and conductor material (copper or aluminium) – is only very hardly flammable and self-extinguishing. There are no special fire prevention restraints. With adjacent fire conditions the calorific potential of the cast resin transformer is low and there is no dangerous long-term fire gases damage.
Fire performance Non-existant coolants:
Cast resin transformers only need air for cooling. Coolants – whichever chemical compounds – can not get in the environment. There aren’t any collection pans. Unrestricted installation possibilities:
The transformer can be placed adjacent to the load centre. Planning the installation is simplified. Installation costs are saved even if cast resin transformers are more expensive than fluid-filled ones.
Installation possibilities
 High flexibility:
The cast resin transformer can be quickly moved without structural constraints just like a switchgear cabinet.
Installation possibilities Advantageous capabilities of the enclosure:
Instead of built transformer cabins and/or cable hoods etc., a enclosure is used for necessary protection. SGB-Vario-Enclosures can be complemented through the flanging of MS- und NS- cabinets to complete focal stations.
Housings
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