Cast Resin Transformers
These transformers use epoxy resin for insulation, providing excellent protection against moisture and environmental contaminants.
Cast Resin Transformers
TMR Transformers manufactures cast resin (dry-type) transformers in which the windings are encapsulated in epoxy resin instead of insulating oil. This solid-insulation design gives excellent protection against moisture, dust and industrial contaminants, and makes the transformer flame-retardant, self-extinguishing and free of oil-leak or fire-spread risk — ideal for indoor and populated environments.
Our cast resin transformers are offered up to 36 kV in three-phase configurations at 50 Hz or 60 Hz, with natural air (AN) or forced air (AF) cooling. Vacuum-cast windings minimise partial discharge and internal voids, while the robust construction withstands demanding thermal and mechanical conditions. Because there is no oil to sample or top up, maintenance is minimal and downtime is low.
Cast resin units are widely used in high-rise and commercial buildings, hospitals, data centres, tunnels, marine installations, industrial plants and renewable-energy systems where fire safety and environmental cleanliness are priorities. As a manufacturer, TMR can supply ratings and enclosures — including IP-rated options — matched to your site. Get a quote for a cast resin transformer for your project.
Key features & specifications
- Primary Voltage: Up to 36 kV
- Frequency: 50Hz / 60Hz
- Phases: Three-phase
- Cooling Systems: Natural air cooling (AN) or forced air cooling (AF)
- Minimal Maintenance: The solid insulation system reduces the need for regular maintenance, lowering operational costs.
- Environmental Protection: Eco-friendly design with no risk of oil leaks, ensuring safe and clean operation.
- Durability: Robust construction ensures long-lasting performance, even in harsh environmental conditions.
- Maintenance-Free: The sealed insulation system requires minimal maintenance, reducing downtime and operational costs.
- Eco-Friendly: No risk of oil leaks, making it an environmentally safe choice.
- Industrial Plants: Provides reliable power distribution in manufacturing and processing facilities.
- Commercial Buildings: Ensures efficient power supply for high-rise buildings, shopping centers, and office complexes.
- Renewable Energy Systems: Integrates with solar and wind power generation systems for efficient energy distribution.
Frequently asked questions
- What is a cast resin transformer?
- A cast resin transformer is a dry-type transformer whose windings are encapsulated in epoxy resin instead of insulating oil. The solid insulation resists moisture and dust and makes the unit flame-retardant and self-extinguishing, with no oil-leak or fire-spread risk.
- What is the difference between cast resin and oil-filled transformers?
- Cast resin (dry-type) transformers use solid epoxy insulation and air cooling, so they are safer indoors and need little maintenance. Oil-filled transformers use insulating oil, generally cost less per kVA at higher ratings and dissipate heat well, but require oil management and fire precautions.
- Where are cast resin transformers used?
- They are ideal for indoor and populated locations such as high-rise and commercial buildings, hospitals, data centres, tunnels, marine installations and industrial plants, as well as renewable-energy systems where fire safety and clean operation are priorities.
- What ratings does TMR manufacture for cast resin transformers?
- TMR manufactures cast resin transformers up to 36 kV in three-phase configurations at 50 Hz or 60 Hz, with AN or AF cooling and optional IP-rated enclosures, all built and tested to order.
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