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Cast Resin Transformers / Dry Type Transformers

Cast Resin Transformers or Dry Type TransformersBowers’ new cast resin transformers can be supplied to suit customers’ requirements either in IP00 specification, or with sheet steel ventilated enclosures and cable boxes, designed and built to bespoke specifications. We can also offer units built integrally within our new manufactured low voltage switchgear.

Bowers’ cast resin transformers are constructed with their HV windings encapsulated in resin and are an excellent alternative to traditional oil-immersed transformers. Self-extinguishing and high mechanical resistance to electro-dynamic stresses are just some of the qualities that make these an excellent choice.

All Bowers’ cast resin transformers are manufactured to BSEN60076, IEC14-4/14-8 and CENELEC HD 464-538. Our standard range of cast resin transformers is from 50kVA up to 3150kVA. However, we are able to design and manufacture special units to suit almost every application imaginable.

Transformer windings
At Bowers we use the best materials that are commercially available in order to produce the best savings. Our HV windings are constructed from electrolytic aluminium or copper strip, having rounded edges and inter-turn polyester film insulation. Each coil is then wrapped in a fibreglass mat to provide mechanical resistance. After the drying process the coils are vacuum filled with Class ‘F’ epoxy resin, which includes quartz or tri-hydrate. Our oven-dried LV windings are usually made from electrolytic aluminium or copper foil, with Class ‘F’ inter-turn pre-impregnated film insulation. As a matter of routine, all HV cast resin transformer coils are partial discharge tested at 110% normal volts to give less than 20pC.

Typical fittings include:

  • HV off-circuit tapping links for ± 2×2.5%
  • Rating plate
  • PT100 temperature devices
  • Earthing terminal
  • Under-base with removable bi-directional rollers

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