10KV Indoor Dry Type Power Distribution Transformer

Cotenele is a well-known transformer manufacturer in China. Our 10KV Indoor Dry Type Power Distribution Transformer has significant advantages including flame retardancy, fire resistance, explosion resistance, maintenance free operation, pollution-free performance, and compact structure. With fully enclosed encapsulated windings, they can be installed directly at the load center. Thanks to scientifically sound design and advanced casting techniques, The SC (B) series epoxy resin dry-type transformer features low partial discharge levels, low operating noise, and excellent heat dissipation capability. Under forced air cooling, they can operate continuously at 125% of rated load for extended periods. Each unit is equipped with an intelligent temperature controller that provides fault alarm, overtemperature warning, overtemperature trip, and black-box recording functions. Via an RS485 serial interface, our dry-type transformers can be connected to a computer for centralized monitoring and control.

Model and meanings

Main technical parameters

SCB11-30~2500/10kV Transformer Technical Parameter

SCB11-30~2500/10kV Transformer Dimensions

SCB12-30~2500/10kV Transformer Technical Parameter

SCB12-30~2500/10kV Transformer Dimensions

SCB13-30~2500/10kV Transformer Technical Parameter

SCB13-30~2500/10kV Transformer Dimensions

Internal Structure

For achieving the best electrical performance, mechanical strength, and thermal management, the internal structure of a dry-type transformer is comprised by multiple key components, all of them need to be carefully designed.

1. Magnetic Core

The main material of the magnetic core of a dry-type transformer is generally laminated electrical steel (silicon steel) or other ferromagnetic materials, which can reduce eddy current loss and hysteresis loss. The shape of the magnetic core can made to be rectangular, circular, or elliptical etc.

2. Windings

The windings of a dry-type transformer consist of primary and secondary windings, typically made of copper or aluminum conductors. Although copper has superior conductivity to aluminum, some customers often opt for aluminum conductors for their windings to save costs.

3. Insulation System

The insulation system of a dry-type transformer provides electrical insulation and mechanical support for the windings, mainly including:

Epoxy resin encapsulation (cast resin): Windings are completely sealed in epoxy resin, which can provide a good protection against moisture, dust, and mechanical stress.

Vacuum Pressure Impregnation (VPI): Windings are impregnated with Class H polyester resin under vacuum and pressure. This role is for enhancing the dielectric strength, mechanical strength, and thermal stability of the dry-type transformer.

Vacuum Pressure Encapsulation (VPE): Windings have a thicker insulation coating than VPI.

4. Clamping Structure

The clamping structure is usually used to secure the windings and core assembly, and it can provide the mechanical strength and ensure proper alignment, which can incorporate cooling channels or openings for air circulation.

5. Enclosure

All the components are mounted within an enclosure, and the enclosures are divided to ventilated, non-ventilated, or sealed, based on the application environment. The ventilated enclosures allow natural or forced air circulation for cooling, while non-ventilated designs are used in environments containing conductive, corrosive, or combustible materials.

Product Advantages

1. Safety Advantages

Reduced fire hazard: The dry-type transformers have no flammable insulating oil and have no fire and explosion risks.

Self-extinguishing properties: Solid insulation materials of the dry-type transformers are inherently flame-retardant.

No toxic gas emissions: Under arcing conditions, the dry-type transformers will not release hazardous gases.

2. Environmental Advantages

Eco-friendly: Due to the dry-type transformer will not leak or spill oil, this can eliminate groundwater contamination concerns.

Recyclable: Up to 90% of materials of the dry-type transformers are recyclable at end of life.

No special containment required: No need to install a leak-proof collection pool for the dry-type transformers.

3. Operational Advantages

These dry-type transformers require virtually no maintenance---no liquid testing or oil filtration, only an occasional visual inspection---and boast an extended service life of over 20 years. Due to fewer site restrictions and the absence of groundwater protection measures, dry-type transformers have lower installation costs. And they can be directly installed close to the actual load location, which can significantly reduce line losses.

4. Application Flexibility

Dry-type transformers can be installed and applied in indoor locations with high fire safety requirements. At the same time, their fully enclosed casings can withstand the risk of water immersion in flood-prone areas. The moisture-proof insulation system of dry-type transformers not only ensures stable electrical performance in high humidity environments but also effectively prevents condensation.

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