Resin Power Transformers

GBE UK manufactures resin transformers up to a power of 30 MVA and a voltage of 52 kV, with an off-circuit or on-load tap changer. The constructive design of a power transformer is completely different from that of a distribution transformer.

The masses involved are quite big, and at the design stage, it is necessary to take into account not just the mechanical and electrical stresses but also the issues related to the materials' expansion during operation.

A correct distribution of the electric field within the windings must be ensured to avoid partial discharges issues or problems related to the overvoltage resonance, and this is guaranteed by the GBE design that considers the proper distribution of the capacities between coils, layers and parts of the coils, and to the ground.

For the power transformers, the constructive design takes into account any dimensional aspects of the transformer based on the type of installation and especially the optimisation of losses so as to guarantee a competitive product, not just considering the purchase price, but also the operation cost.

What is a Resin Power Transformer?

A Resin Power Transformer is a dry‑type power transformer whose windings and insulation are manufactured and treated to operate without liquid dielectric, with GBE producing units up to 30 MVA and 52 kV and offering Off‑Circuit or On‑Load Tap Changers; the construction differs from distribution units because of the much larger masses, mechanical stresses and thermal expansion that must be managed in a power design.

How does a Resin Power Transformer work?

It transfers energy between primary and secondary windings, like any transformer, but the design emphasises correct electric-field distribution across coils, layers, and to earth, so partial discharges and overvoltage resonance are avoided. Mechanical layout, material selection, and winding geometry are calculated at the design stage to control thermal expansion and electrical stresses during operation.

What are the benefits of a Resin Power Transformer?

Key benefits include reduced fire risk compared with oil‑filled machines, lower maintenance from dry construction, and the ability to deliver high power reliably because the design optimises losses and mechanical robustness, giving a competitive lifetime cost, not just a low purchase price; GBE’s approach specifically targets partial‑discharge prevention and loss optimisation to improve service life and operating economy.

Where are Resin Power Transformers used?

They are specified where high power, safety and long‑term reliability are required. For example, in power plants, large industrial installations and substations where 30 MVA / 52 kV class units are needed and where designers demand tight control of electric‑field distribution, low operational losses and minimal on‑site maintenance.