Cast Resin Transformers

Reliable, efficient and environmentally responsible, cast resin transformers represent the modern standard for power transformation technology.

Exceptional electrical performance with enhanced safety

Cast resin transformers are a specialised type of dry-type transformer, manufactured in accordance with IEC/EN 60076-11 standards, in which the active parts are vacuum-cast and encapsulated in high-quality epoxy resin rather than immersed in insulating oil. This advanced design combines exceptional electrical performance with enhanced safety, making cast resin transformers an increasingly popular solution across commercial, industrial, infrastructure and renewable energy applications.

High service reliability, even in demanding environments

Thanks to continuous advancements in manufacturing processes and insulation materials, cast resin transformers deliver outstanding service reliability, even in demanding environments. Their robust construction provides excellent resistance to moisture, dust, condensation and environmental contaminants, ensuring dependable operation throughout their service life.

Reduce risk and operational cost

With no insulating liquid required, cast resin transformers virtually eliminate the risks associated with oil leakage, fire hazards and environmental pollution. They also require minimal maintenance, helping to reduce operational costs while supporting a safer and more sustainable power distribution network.

Reasons to choose Cast Resin Transformers

Safety & Reliability

Reduced risk of fire, delivering enhanced operational safety.
Reliable performance with minimal maintenance requirements.
Suitable for installation closer to critical loads, improving power distribution efficiency.

Flexible Installation

Ideal for indoor applications, with outdoor solutions available on request.
Can be installed close-coupled to main distribution switchgear through bus-coupled connections, reducing cabling requirements.
No need for costly civil construction works or oil containment systems.
Easily retrofitted into existing commercial and industrial buildings.

Compact Design

Small footprint with a tall, slim construction.
Reduced instrumentation requirements.
Maximises available floor space in buildings and plant rooms.

Sustainability & Environmental Benefits

Environmentally friendly design with no insulating oil.
Eliminates the risk of oil leaks and associated environmental contamination.
Manufactured using up to 85% recycled materials.

Reduced Lifetime Costs

Virtually maintenance-free operation.
Lower installation and infrastructure costs.
Reduced manufacturing lead times, helping to accelerate project delivery.

Designed to minimize losses

Casting process

The casting process minimises the deposit of pollution and corrosive particles as well as being strong and waterproof. The active parts are cast with a resin mixture of quartz flour and epoxy resin after being secured to a mould and preheated under vacuum.

Power Transformer Windings

The cast windings are divided in many tapes having only one turn for each layer – achieving a higher impulse voltage resistance capability and a lower risk of partial discharge. The winding is usually made with aluminium tape therefore mechanical stresses due to the transformer’s temperature variation are reduced. Low voltage windings are manufactured by a single foil of aluminium or copper, producing a strong resistance against short-circuit stress because the dielectric stresses are very low.

Insulation

The windings are very resistant to condensation and pollution ensured by the use of pre-impregnated Class F insulating materials – making the winding solid and strong but at the same time free to move with a certain degree of flexibility.

Magnetic Core

The magnetic core of the transformer is manufactured with highly permeable, low-loss grain-oriented steel sheets with 45 degree step-lap joints – designed to minimize stray-flux losses. The surface of the magnetic core is also covered by a special paint that protects it against oxidation and corrosion as well as reducing noise.