So why Cast Resin Transformers? The advantages speak for themselves: Minimal fire risk: Cast resin moulding material is not very flammable and can be self-extinguishing. There are no special fire prevention coatings, with associated fire conditions, the calorific potential of the cast resin transformer is minimal and there are no dangerous fire gases capable of long-term damage. No coolants: Cast resin transformers only need air for cooling. Liquid coolants - of whichever chemical type - cannot be released into the environment. There is therefore nonrequirement for bunding a cast resin transformer,...

Why Cast Resin Transformers from SGB? SGB are able to deliver Cast Resin Transformers with capacities up to 25 MVA and series voltages up to 36 kV. Our offer includes converter transformers, distribution transformers and special transformers. With more than 30 years experience in the construction of cast resin transformers, SGB has worldwide expertise, and this is expressed in remarkably high quality coefficients such as mean time between failure (MTBF) of over 1,700 years. Thanks to their unique design, SGB Cast Resin Transformers offer a range of features which setthem aparttechnically from...

K e s U ResinQualitybySGB High voltage winding The high voltage winding is the centrepiece of the cast resin transformer. Herein lies SGB's great technical know-how. Core and low voltage winding are also important for the overall design, as all components are naturally interdependent. One of the characteristics of cast resin transformers is that the conductors of the high voltage winding are completely encapsulated in a cast resin body with a smooth surface. This can only be carried out in moulded formers under vacuum. SGB's production technology and materials used can also be distinguished through...

Rjeserves-equipped Thermal loads make overload possible SGB Cast Resin Transformers not only have an advantage over oil transformers but also cast resin transformers incorporating established alternative designs. These use a high voltage winding design where the conductor consists of aluminium foil strip and the coil/layer insulation is plastic. The insulation level of this type of system can only be considered as class F, when considering the insulation system as a whole. It is quite different with SGB Cast Resin Transformers as SGB uses insulated profile wires for a double layer winding where...

K e s U ResinQualitybySGB S|urge-proof High impulse voltages are controlled safely Only SGB Cast Resin Transformers mould their high voltage coils in vacuum combined with a double layer winding. This ensures safety in the control of impulse voltages brought about by, for example, lightning strikes or vacuum switches. Regular coil winding of other transformers leads to much greater voltage stress, especially on the input coils, because 70% of the shock impact does not apply on the first 30% of the coils. The risk of winding short circuits therefore increases significantly. Օ The SGB double layer...

Q|uantum-leap Overcome temperature shocks reliably Cast resin transformers are subject to great mechanical and thermal shocks and strains in their transport and in particular when operated. Therefore of great importance is the ability of the transformer to safely control spasmodic temperature increases. A decisive factor in this feature is the construction of the cast resin composite material, into which the conductors are moulded. This depends especially upon the tensile stress and the thermal coefficients of expansion of the composite material in relation to the winding material. With many...

K e s U ResinQualitybySGB Core With the calculation of cores for cast resin transformers, no-load losses, noises and no-load currents are quite considerable and in many cases, crucial quality features. As a result, the choice of high-quality materials for core design and manufacture is vital. For SGB Cast Resin Transformers a cold-rolled, grain-oriented magnetic plate is used and has a typical loss factor of 0.85 W/kg. In most cases of application, values according to the requirements for no-load losses and noises can be reached. For spcial requests a so-called Hi-B plate is used with which the...

Low voltage winding SGB Cast Resin Transformers' low voltage winding is almost always used as a full length foil winding. The advantages of this form of winding are vident: R镩duction of additional losses Even temperature distribution in the coil Օ High short circuit consistency Exceptions exist if the LV winding is rated as less than 160 kVA or has a voltage rating of over 3 kV. For more than 40 years SGB has been producing foil windings for distribution transformers and cast resin transformers. This long expertise is the reason for high quality features such as: SGB uses treated material...

Upper core clamp Lifting lugs

KesU ResinQualitybySGB Quality SGB has been producing cast resin transformers for over 30 years and therefore has the greatest wealth of experience in this field worldwide. This remarkable know-how is reflected in exceptionally high quality coefficients, such as MTBF of over 1,700 years. SGB Cast Resin Transformers naturally comply with all the usual quality standards such as: Fire class F1 Օ Environmental class E2 Climatic class C2. The manufacture of cast resin transformers is of course certified within SGB in accordance with ISO 9001 and ISO 14001. As a provider to OEM customers with high...

Tests SGB Cast Resin Transformers are designed and produced as standard in accordance with IEC 60076-11. SGB Cast Resin Transformers comply with all the tests required in IEC 60076-11 All detailed inspections and type tests, e.g. short circuit tests or temperature rise tests as well as many special tests have been completed in the course of our supply. In this way the specific properties stipulated in the customer specification can also be checked, and met. In conjunction with external institutes, we have also completed detailed measurements for the following areas: EMV Electromagnetic tolթrance...