A dry-type transformer is an electrical transformer that uses air, epoxy resin, or cast resin for insulation and cooling, instead of traditional insulating oil. This design eliminates oil leakage risks and fire hazards, making dry-type transformers the preferred choice for indoor installations, commercial buildings, hospitals, data centers, and industrial facilities where safety and reliability are paramount.
Our dry-type transformers feature epoxy resin vacuum-cast coils with outstanding characteristics — low loss, low noise, low partial discharge, high mechanical strength, high electrical strength, and high thermal resistance. With excellent heat dissipation, strong moisture resistance, superior short-circuit withstand capability, and large overload capacity, these transformers deliver reliable performance in the most demanding environments
The dry-type design uses no flammable insulating oil, significantly reducing fire risk. The epoxy resin encapsulation is self-extinguishing and produces no harmful gases when exposed to fire, making it ideal for fire-sensitive environments.
The iron core is crafted from high-grade cold-rolled grain-oriented silicon steel sheets with a multi-stage step-lapped fully-oblique joint structure, minimizing no-load losses. Our transformers comply with national first and second-level energy efficiency standards, helping reduce operational costs and carbon footprint.
Coils are vacuum-cast with imported H-grade epoxy resin (1-3 mbar vacuum level), ensuring a bright, crack-free surface with no moisture absorption. The encapsulated windings provide excellent mechanical strength and resistance to moisture, dust, and chemical corrosion, significantly extending service life.
Equipped with cross-flow fans that can be manually or automatically controlled, the transformer supports both natural air cooling (AN) and forced air cooling (AF) modes. Under forced air cooling conditions, the transformer can operate at up to 150% of rated load.
Integrated intelligent temperature controllers enable remote temperature display and status monitoring, providing long-term protection and real-time fault alerts.
Oil-free construction means zero risk of oil leakage, making these transformers fully compliant with environmental protection requirements for clean and low-pollution applications.
Applicable Standards:
GB/T 1094.11-2022 Power transformers – Part 11: Dry-type transformers
GB/T 10228-2023 Technical parameters and requirements for dry-type power transformers
GB 20052-2024 Energy efficiency limits and energy efficiency grades for power transformers
Our dry-type transformers are widely deployed across:
✅ Proven Quality – Our transformers have passed KEMA E2, C2, and F1 tests, validating their environmental adaptability, fire resistance, and mechanical strength.
✅ Customizable Solutions – We offer flexible voltage, capacity, and connection group configurations to meet diverse project requirements.
✅ Low Maintenance – Oil-free design eliminates regular oil checks and replacements, significantly reducing operational costs.
✅ Quiet Operation – Optimized noise and vibration reduction design makes our transformers suitable for noise-sensitive indoor and urban applications.
✅ Global Compliance – All products are manufactured in strict accordance with IEC and GB standards, ensuring international acceptance.
Q: Are dry-type transformers suitable for outdoor installation?
A: Yes, with proper enclosure and protection, dry-type transformers can be installed outdoors.
Q: What is the typical service life of a dry-type transformer?
A: With proper maintenance, dry-type transformers typically last 20–30 years.
Q: How do dry-type transformers compare to oil-filled transformers?
A: Dry-type transformers offer lower fire risk, minimal maintenance, and eco-friendly operation, making them ideal for indoor and populated areas.
Q: Can dry-type transformers handle overload conditions?
A: Yes. Under forced air cooling, they can operate at up to 150% of rated load.
