dry-insulated transformers

I. Product Introduction

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

2. Basic technical parameters parameter (customizable)

Rated Voltage | High Voltage: 35kV (±3×2.5%); Low Voltage: Rated Capacity 10kV/0.4kV | Frequency 50KVA-8000KVA | Connection Group 50Hz | Insulation Class Dyn11/Yyn0 | Class F windings (tested according to the temperature rise criteria of Category B) Temperature Rise Limit | Windings ≤80K (B-Class) Short Circuit | 4%–6% (configurable according to the capacity) Partial Discharge Rate | ≤10pC Noise Level | ≤55dB (distance 1m from the equipment) Protection Rating | IP20–IP54 (indoor/outdoor selectable) Operating Environment | Temperature: -25°C to +55°C; Humidity: ≤95% (no condensation)

3. Key Features

1. Inherently safe design with zero fire risk. A completely dry, oil-free construction using highly fire-resistant epoxy resin casting ensures non-flammability, non-explosive properties, and no toxic fumes. This eliminates the need for expensive fire oil tanks, making it a safety priority in congested spaces such as shopping malls, hospitals, and subways.

2. Class I energy efficiency with extreme savings: Using high-quality oriented silicon sheet cores and highly conductive copper foil coils, the no-load and load losses are significantly lower than national standards, meeting the national Class I energy efficiency standard. Long-term operation shows impressive energy-saving effects, while the comprehensive operating and maintenance costs are among the lowest in the world.

3. Exceptionally high short-circuit resistance: The foil coil design combined with integrated epoxy casting provides exceptional mechanical strength, effectively withstanding short-duration power surges and preventing coil deformation and burnout. The service life of the equipment exceeds 30 years.

4. Low-noise operation and environmental protection: By optimizing the 3D connection of the iron core and using advanced vibration damping technology, the operating noise is controlled below 55dB, which is much lower than traditional oil-immersed transformers, making it suitable for urban and indoor installations with strict acoustic requirements.

5. Moisture and Dust Resistance: Integrated maintenance-free sealing and a full life cycle provide superior moisture and corrosion resistance, ensuring stable operation in harsh environments such as high humidity, dust, and coastal areas. No oil refilling, filtration, or replacement is required, ensuring true maintenance-free operation.

6. Extremely low partial discharge with reliable operation. The vacuum casting process ensures the absence of internal bubbles and air gaps in the coil, resulting in partial discharge (≤10 pS) significantly lower than industry standards. This provides excellent thermal insulation and power supply reliability, significantly outperforming oil-immersed transformers.

4. Application scenarios

1. Urban core infrastructure • Scenarios: metro stations, high-speed rail stations, airports, tunnels and large-scale underground complexes.

• Requirements: low noise, safety, fire and explosion resistance to ensure stable power supply to major transport hubs.

2. High-end commercial and civil buildings • Application: super-tall office buildings, five-star hotels, large shopping malls and high-end residential complexes.

• Requirements: High efficiency and energy saving. Compact space and silent operation, meeting green building standards.

3. Large industrial complexes • Applications: petrochemical plants, metallurgical plants, electronic factories, data centers and precision machining shops.

• Requirements: High short-circuit resistance, moisture and pollution resistance, high reliability to ensure continuous production without power outages.

4. Special Environments and New Energy • Applications: Coastal areas with high salt fog content, cold areas and domestic power distribution in substations with photovoltaic/wind power enhancement.

• Requirements: corrosion resistance, cold resistance, high thermal insulation and adaptation to various challenging climates and energy topologies.