Dry type cast resin transformer is suitable for power transmission and distribution system, hotel, restaurant, hospitals, shopping malls, bank buildings ,stadiums, airports, stations especially heavy load centers and places with special fire protection requirements.
Dry type power transformer is the best choice for specific markets where safety or ecology are main concerns.
1. Core
The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel laminations insulated on both sides, guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.
2.Windings
The winding coil is made of oxygen-free copper, class H for main insulation materials and coil is insulated by NOMEX paper of DUPONT brand, LV winding is isolated by copper foils. All these make the heat-resistant is up to 220℃, with excellent overload capacity and low loss, but high efficiency.
3. Insulation System
Varelen practices strictly exclusive casting system of F(155℃) or H(180℃), and the epoxy resin is injected and casted in the vacuum machine, so it’s highly insulated, dust-proof and moisture-proof, which ensures stable and reliable performance.
4. Enclosure
The enclosure protects the transformer from environmental factors like dust, moisture, and physical damage. It is usually made of metal (steel or aluminum) and may include ventilation openings for cooling. enclosure protection IP00-IP42
5. Cooling System
6. Terminals and Bushings
Terminals provide connection points for input and output cables, while bushings are insulating devices that allow electrical connections to pass through the enclosure safely.
7. Tap Changer (Optional)
Tap changer is available to adapt respective network conditions.
8. Temperature Monitoring and Protection Devices
Temperature sensors (e.g., thermocouples or RTDs) monitor the transformer’s operating temperature, while over-temperature protection devices (e.g., thermal switches) can trigger alarms or shut down the transformer in case of overheating.
9. Mounting Frame or Base
The mounting frame provides structural support and ensures the transformer is securely installed. It may also include vibration dampers to reduce noise and mechanical stress.
Cast Resin Dry Type Transformers are fabricated with an epoxy resin. The windings are completely embedded under vacuum conditions. This casting method makes it possible to assure void-free epoxypenetration of both the inner layer and turn to turn insulation.
Dry-type transformers offer several benefits that make them a preferred choice in many applications:
Fire Safety: Since they do not use flammable liquids like oil, dry-type transformers are inherently safer and reduce the risk of fire hazards.
Environmentally Friendly: They eliminate the risk of oil leaks, making them more eco-friendly and easier to dispose of.
Low Maintenance: Dry-type transformers require minimal maintenance compared to oil-filled transformers.
Compact Design: Their compact and lightweight design makes them ideal for space-constrained installations.
Versatility: They can be used both indoors and outdoors, making them suitable for a wide range of applications.
Commercial Buildings:
Hospitals and Healthcare Facilities:
Data Centers:
Industrial Facilities:
Renewable Energy Systems:
Dry-type transformers are an essential component of modern electrical systems, offering a safe, reliable, and environmentally friendly solution for power distribution. With their robust design, low maintenance requirements, and versatility, they are well-suited for a wide range of applications. Whether you’re managing a commercial building, a healthcare facility, or an industrial plant, dry-type transformers provide the performance and safety you need.
