3 phase dry type transformer

I. Product Introduction 

The 35kV-class resin-cast dry-type transformer is a core power transmission and distribution equipment designed for 35kV voltage levels. Utilizing advanced epoxy resin vacuum casting technology, it integrates high-voltage windings, iron cores, and low-voltage windings into a single unit, offering key advantages such as oil-free operation, safety, energy efficiency, and maintenance-free performance.

The product is designed in strict compliance with national standards such as GB/T 1094.11 and GB/T 10228, serving as a standard configuration for indoor high-voltage power supply scenarios including modern urban power grids, large industrial plants, rail transit systems, hospitals, and data centers. It represents an environmentally friendly alternative to traditional oil-immersed transformers.

2. Core Technical Parameters  Parameter （customizable）

| Product Model | SCB13/SCB14 Series   Rated Voltage | High Voltage: 35kV (±3×2.5%); Low Voltage: 10kV/0.4kV  Rated Capacity | 200kVA to 2500kVA  Rated Frequency | 50Hz  Connection Group | Dyn11/Yyn0  Insulation Class | F-grade windings (tested under B-grade temperature rise criteria)  Temperature Rise Limit | Windings ≤80K (B-grade)  Short-circuit Impedance | 4%–6% (customizable based on capacity)  Partial Discharge Level | ≤10pC  Noise Level | ≤55dB (1m distance from equipment)  Protection Rating | IP20–IP54 (indoor/outdoor selectable)  Operating Environment | Temperature: -25°C to +55°C; Humidity: ≤95% (no condensation) 

 3. Key Features 

 1. Intrinsically Safe Design with Zero Fire Hazards  Fully dry oil-free construction using high-flame-retardant epoxy resin casting, ensuring non-combustibility, non-explosiveness, and zero toxic fume emission. Eliminates the need for expensive fire oil tanks, making it the safety-first choice for crowded spaces such as shopping malls, hospitals, and subways.

2. Class I energy efficiency with extreme energy savings: Utilizing high-quality oriented silicon steel sheet cores and highly conductive copper foil windings, both no-load and load losses are significantly lower than national standards, achieving the national Class I energy efficiency standard. Long-term operation demonstrates remarkable power-saving effects, with comprehensive operation and maintenance costs being among the lowest globally.

3. Exceptionally strong short-circuit resistance: Featuring a foil-coil structure combined with integral epoxy casting, it exhibits ultra-high mechanical strength, effectively withstanding sudden short-circuit surges in power grids while preventing coil deformation and burnout incidents. The equipment has a service life exceeding 30 years.

4. Low-noise operation and environmental friendliness: By optimizing the 3D joint structure of the iron core and employing advanced vibration damping technology, the operating noise is controlled below 55dB, significantly lower than traditional oil-immersed transformers, making it suitable for urban and indoor installation environments with stringent acoustic requirements.

5. Moisture and dust resistance: The maintenance-free integrated sealing structure with full lifecycle performance exhibits superior moisture-proofing, dust-proofing, and corrosion-resistant capabilities, enabling stable operation in harsh environments such as high humidity, dusty conditions, and coastal areas. No oil refilling, filtration, or replacement is required, achieving true maintenance-free operation.

6. Extremely low partial discharge with reliable operation. The vacuum casting process ensures zero internal bubbles and air gaps in the coil, resulting in partial discharge levels (≤10pC) far below industry standards. It exhibits superior insulation performance and power supply reliability that significantly surpasses oil-immersed transformers.

4. Application Scenarios

 1. Urban Core Infrastructure • Scenarios: Subway stations, high-speed railway stations, airports, tunnels, and large-scale underground complexes.

• Requirements: Low noise, safety, fire and explosion resistance, to ensure stable power supply for core transportation hubs.

2. High-end commercial and civil buildings • Applications: supertall office buildings, five-star hotels, large shopping malls, and upscale residential complexes.

• Requirements: Energy-efficient with Class 1 energy performance, compact space footprint, and silent operation, compliant with green building standards.

3. Large industrial complexes • Applications: petrochemical plants, metallurgical facilities, electronic manufacturing plants, data centers, and precision machining workshops.

• Requirements: Strong short-circuit resistance, moisture and contamination resistance, high reliability to ensure uninterrupted production without power outages.

4. Special Environments and New Energy • Applications: Coastal areas with high salt fog, cold regions, and indoor power distribution in photovoltaic/wind power step-up substations.

• Requirements: Corrosion-resistant, cold-resistant, high insulation performance, and adaptable to various complex climates and energy topologies.