800-25000KVA 35KV Level Dry Type Power Transformer Airport Industrial Use

Best-selling 35KV Level Dry-type Power Transformer Airport Industrial Use

The Three Phase 35KV Level Dry-type Power Transformer is an advanced epoxy resin cast dry-type distribution transformer engineered specifically for the demanding power requirements of airports, industrial facilities, and critical infrastructure. Utilizing state-of-the-art vacuum casting technology with high-grade epoxy resin, this transformer delivers exceptional electrical performance, operational reliability, and environmental safety.

Designed for three-phase, 50/60Hz power systems, this transformer is available in capacities ranging from 30 kVA up to 25,000 kVA, with primary voltages up to 35kV. It serves as the ideal solution for stepping down 35kV grid power to lower distribution voltages (0.4kV, 10kV, or custom voltages) for airport terminals, industrial plants, commercial buildings, and infrastructure projects.

The dry-type design eliminates the need for oil or other hazardous liquids, making it a fire-safe and environmentally friendly solution—particularly critical for airports and other public facilities where fire safety regulations prohibit oil-filled equipment. The transformer has been successfully deployed in numerous landmark projects including the world's highest-altitude civil airport—Daocheng Yading Airport, Beijing Daxing International Airport, Sanya Phoenix International Airport, and the Hong Kong-Zhuhai-Macao Bridge

Product Structure

Product Features

🔥 Superior Fire Safety & Flame Resistance

The transformer is encapsulated with flame-retardant Class F or Class H epoxy resin that passes UL94 V-0 flame resistance testing. Unlike oil-immersed transformers, this dry-type design poses no fire hazard from oil leaks, making it ideal for indoor installations, airport terminals, and fire-sensitive environments. The epoxy resin casting provides a耐火极限 of up to 180 minutes, offering critical protection for life-safety systems in airports and public buildings.

⚡ High Mechanical Strength & Short-Circuit Resistance

The coil structure features high mechanical strength and exceptional resistance to short-circuit forces—capable of withstanding up to 32 times rated current impact during short-circuit events. The winding structure employs circular configurations with advanced insulation materials, ensuring optimal resistance to load variations and temperature fluctuations. The advanced design ensures that electric field strength across all components remains well below insulation material thresholds.

📉 Low Loss & Energy Efficiency

The core is manufactured from high-performance cold-rolled grain-oriented silicon steel using fully automatic robotic stacking, achieving minimal burr and low stacking factor—reducing no-load losses by 5–10% compared to manual stacking methods. The transformer complies with GB 20052-2024 energy efficiency standardsand meets Grade 1, Grade 2, or Grade 3 energy efficiency requirements. Full-load efficiency reaches ≥98.5%. Partial discharge levels are exceptionally low, controllable below 5pC.

🔇 Low Noise Operation

Advanced core design and precision manufacturing techniques result in significantly reduced operational noise levels, meeting the strict low-noise requirements of grid operators and airport environments—a critical feature for terminal buildings where passenger comfort is paramount.

🌧️ Excellent Moisture & Environmental Resistance

The epoxy resin vacuum casting process completely seals the windings, providing superior protection against moisture, humidity, dust, and corrosive environments. The transformer can operate reliably in 100% humidity conditions without pre-heating before commissioning. It is suitable for operation in ambient temperatures ranging from -25°C to +40°C and at altitudes up to 1000m—with high-altitude operation available up to 4000m with appropriate derating.

🛠️ Maintenance-Free Operation

With no oil to monitor, filter, or replace, the dry-type transformer requires minimal maintenance throughout its service life. The robust epoxy encapsulation protects windings from environmental degradation, ensuring long-term reliability with a design life of no less than 30–40 years.

📊 Intelligent Temperature Monitoring

The transformer can be equipped with an intelligent temperature control system that automatically detects and displays the operating temperature of each phase winding. The system provides automatic fan start/stop control, over-temperature alarms, and trip functions for comprehensive protection

Typical Applications

The 35kV dry-type transformer is widely used in medium-voltage power distribution systems requiring safe and continuous operation.

Airport Power Systems

• Passenger terminals
• Airfield lighting systems
• Baggage handling equipment
• Airport operation centers
• Maintenance facilities

Industrial Manufacturing

• Steel plants
• Cement factories
• Mining operations
• Petrochemical facilities
• Automotive manufacturing
• Heavy machinery workshops

Commercial Buildings

• Office complexes
• Shopping malls
• Hotels
• Exhibition centers
• Financial institutions

Public Infrastructure

• Hospitals
• Universities
• Metro stations
• Railway hubs
• Government buildings

Renewable Energy

• Solar power plants
• Wind farms
• Battery energy storage stations
• Hybrid energy systems

Data Centers & Communication Facilities

• Cloud computing centers
• Telecommunication base stations
• UPS distribution rooms
• Network operation centers

FAQ

Q1: Why are dry-type transformers preferred for airports?

A: Airports are critical public facilities with stringent fire safety requirements. Dry-type transformers use epoxy resin instead of flammable oil, eliminating fire risks from oil leaks. They are also maintenance-free, have low noise levels suitable for terminal environments, and can be installed indoors directly in load centers. Major airports including Beijing Daxing, Sanya Phoenix, and Daocheng Yading have adopted dry-type transformers for these reasons.

Q2: What is the difference between dry-type and oil-immersed transformers?

A: Dry-type transformers use epoxy resin as the insulation medium instead of oil. This provides key advantages: fire safety (no flammable oil), environmental friendliness (no risk of oil leaks), maintenance-free operation (no oil changes or filtration), and suitability for indoor installation. Oil-immersed transformers typically offer higher capacity ratings but require regular oil maintenance and have higher fire risks. Dry-type transformers are generally limited to voltages up to 35kV.

Q3: What capacity and voltage ranges are available?

A: Our 35kV dry-type distribution transformers are available in capacities from 30 kVA up to 25,000 kVA. Primary voltage is 35kV (with 38.5kV and 36.75kV options), and secondary voltage can be customized to 0.4kV, 10kV, 0.69kV, or other voltages based on your requirements. Custom multi-tap and multi-winding designs are also available.

Q4: What standards do these transformers comply with?

A: Our transformers comply with GB/T 10228-2023, GB/T 1094.11-2022, GB 20052-2024 (energy efficiency), IEC 60076, and GB/T 22072-2018. International certifications such as CE, and other regional standards are available upon request.