What Are Cast Resin Dry Type Transformers?

Cast resin dry type transformers are advanced three-phase power transformers that use epoxy resin to encapsulate their windings instead of relying on liquid insulation. This design eliminates the risk of oil leaks or fire hazards, making them ideal for indoor and fire-sensitive environments such as commercial buildings, hospitals, airports, and tunnels.

Unlike oil-filled transformers, these units offer excellent resistance to moisture, dust, and chemical pollutants, ensuring safe and reliable operation even in harsh or humid environments.

Why Use Cast Resin Dry Type Transformers?

Fire Safety & Reliability

The resin-encapsulated windings are flame-retardant, self-extinguishing, and produce minimal smoke in case of overheating, meeting international fire safety standards (e.g., IEC 60076-11). No risk of oil leakage ensures safe use in populated or sensitive areas.

Low Maintenance & Durability

With no need for oil checks, filtration, or leakage monitoring, these transformers are virtually maintenance-free. They provide a long operational lifespan (20+ years) with high resistance to mechanical stress, thermal cycling, and partial discharge.

Energy Efficiency

Built with low-loss silicon steel cores and optimized copper or aluminum windings, cast resin transformers achieve high electrical efficiency while operating quietly (<55–60 dB for 1000kVA), making them suitable for indoor installations.

Key Features of Cast Resin Dry Type Transformers

• Encapsulated Windings:
  Windings are fully embedded in epoxy resin, providing excellent dielectric strength and environmental protection.

• Cooling System:
  Naturally air-cooled (AN), with optional forced-air cooling (AF) for higher power ratings or compact installations.

• Safety Components:
  Equipped with temperature sensors (PT100 or digital), overheat alarms, optional fans, and protection relays for thermal monitoring and load control.

• Environmental Resilience:
  High humidity and pollution tolerance, suitable for IP23–IP44 enclosures; optional IP54 housings available for dusty or wet environments.

• Noise & Vibration:
  Low operating noise and vibration levels make them ideal for installation in schools, hospitals, shopping malls, and office buildings.

Applications of Cast Resin Dry Type Transformers

• Commercial and Residential Buildings

• Hospitals and Data Centers

• Industrial Plants and Underground Facilities

• Subways, Airports, and Tunnels

• Renewable Energy Systems (e.g., wind & solar inverter stations)

Standards and Compliance

• Design Standards: IEC 60076-11, ANSI/IEEE C57.12.01, GB/T 10228

• Testing: 100% routine testing per IEC; optional type and special tests available

• Certifications: CE, ISO9001, ISO14001, ISO45001, RoHS (on request)

Advantages of Cast Resin Dry Type Transformers

• Safe and Fire-Resistant Design

• No Risk of Oil Leaks or Contamination

• Low Partial Discharge and High Moisture Resistance

• Compact, Quiet, and Easy to Install

• Minimal Maintenance and Long Service Life

Choose CHBEB

Choose CHBEB Cast Resin Dry Type Transformers for your next indoor or environmentally sensitive power project. With over 60 years of experience in transformer manufacturing, CHBEB offers customized dry-type transformer solutions for commercial, industrial, and renewable energy applications worldwide.

👉 Need technical specs or datasheets?
Contact our team or download specifications for power ratings from 100kVA to 2500kVA.