MV/LV Dry Type Transformers
A distinctive element of the dry transformer is the fact that the magnetic circuit and the windings are not immersed in an insulating liquid. It could be MV/LV, MV/MV, or LV/LV with cast coils or resin impregnated coils.
Cast Resin Transformer:
- The MV coil – cast in resin
- The LV coil- cast or impregnated in resin.
Definition impregnated in resin (in-air transformer)
- The MV coil – impregnated in resin
- The LV coil – impregnated in resin
The core is made of high magnetic permeability grain-oriented electrical sheet, with with a 45 degree cut and intercalated step lap joints method. Alternatively, it could be of amorphous type, and which is a crystalline structure that guarantees extremely low losses, up to 4 times lower compared to the standard grain oriented solution.
The MV windings are made with fully automatic machines which insulate the wire or strip, either aluminium or copper, with class F or H insulation materials. The MV windings can be impregnated in polyester resin or cast in epoxy resin. The epoxy resin is loaded with aluminium, silicone and other additives that modify the mechanical characteristics and the TG (transition temperature). This guarantees to meet the most severe climate and environmental classes such as: low temperatures down to -60°C or high temperatures up to +60°C, and any other saline high condensation environment or environment with high pollution as required by the regulations in force for some types of application.
The LV windings are made of aluminium or copper foil or strip, insulated with class F or H materials and vacuum pressure impregnated with class H high cementing polyester resin that gives the coil excellent insulation and mechanical sealing. For special applications the insulation used is the pre-impregnated type and on request can be cast on an epoxy resin mould. The terminals are automatically welded for the whole length of the winding, to provide easy accessibility and high mechanical resistance to electrodynamic stresses.
All steelwork is of GBE production and is galvanised to allow installation in even the most aggressive environments. For some installations, the transformer can be equipped with IP protective box required for indoors or outdoors.
Therefore, GBE production are suitable for installations in hospitals, banks, public and residential buildings, and also on ships, galleries, subways and offshore platforms.
A customised supply for one of the most innovative oil rigs in Europe GBE, a company capable of developing customized solutions covering all kinds of products, satisfying any installation need and managing also the machining processes internally, has played once again a strategic role in one of its recent supplies. For the Tempa Rossa plant, […]
The economic and compact solution for adjusting the grid voltage, optimising the performance of the transformer and reducing losses In most countries in Europe (and around the world), the voltage of the power lines for the distribution of energy varies by more than +/- 10%, no longer guaranteeing the maximum limit as required by EN50160. […]
The aim is to reduce losses and gain in efficiency. GBE are ready, thanks to their high ECODESIGN transformers production. The global commitment for energy efficiency and emissions reduction keeps moving on. The newest European Union Legislation 548/2014 sets the new standards about ecodesign, imposing a drastic reduction on losses of new transformers launched on […]