Structural Features and Forms of Dry-Type Transformers

Dry-type transformers are an important piece of electrical equipment, widely used in power systems and their distribution networks. Compared to oil-immersed transformers, dry-type transformers offer numerous advantages such as high safety, environmental friendliness, and ease of maintenance, making them favored in modern electrical engineering. This article will provide a detailed discussion on the structural features and forms of dry-type transformers.

Structural Features of Dry-Type Transformers

1.Winding Materials

The windings of dry-type transformers primarily use copper or aluminum as conductive materials, which are widely applied due to their excellent electrical conductivity. Additionally, the epoxy resin insulation layer plays a crucial role in ensuring the performance of dry-type transformers. Epoxy resin not only possesses excellent heat resistance but also maintains good insulation properties in harsh environments such as high temperatures and high humidity, effectively reducing the failure rate of the transformers.

2.Cooling Method

Dry-type transformers use natural air cooling or forced ventilation cooling. The design of the structure itself allows for free circulation of air, promoting heat dissipation. This not only enhances the operational efficiency of the transformer but also extends its service life. In high-power applications, forced ventilation cooling can be enhanced through devices such as fans to improve heat dissipation, ensuring safe and stable operation of the transformer under high load conditions.

3.Insulation Structure

The insulation structure of dry-type transformers is relatively complex, typically consisting of insulating materials, insulating boards, and insulating supports. The use of insulating materials is not limited to epoxy resin but also includes various insulating papers and plastics, allowing for adaptation to different environmental and load requirements. The insulation structure of dry-type transformers effectively blocks the intrusion of external moisture, dust, and pollutants, thereby enhancing overall durability and safety.

4.Size and Weight

Compared to oil-immersed transformers, dry-type transformers have the advantages of being smaller and lighter. For the same power rating, dry-type transformers occupy less floor space than oil-immersed transformers. This characteristic makes dry-type transformers particularly advantageous in densely populated urban areas and confined spaces.

Forms of Dry-Type Transformers

Dry-type transformers come in various forms and can be classified based on different usage scenarios and requirements. Here, they are mainly divided into the following forms:

1.Vertical Dry-Type Transformers

Vertical dry-type transformers are primarily arranged in a vertical configuration, suitable for situations with mixed electrical loads, limited space, and high height requirements for equipment. Due to their compact size, vertical dry-type transformers can effectively save space and are commonly used in the power supply systems of urban buildings.

2.Horizontal Dry-Type Transformers

Horizontal dry-type transformers adopt a horizontal arrangement, suitable for cases with concentrated electrical loads. This type of transformer, due to its low center of gravity design, is relatively stable and has a high seismic performance, making it commonly used in industrial parks, power plants, and similar locations.

3.Isolation Dry-Type Transformers

Isolation dry-type transformers are primarily designed for electrical isolation and are widely used in scenarios with high electrical safety requirements, such as hospitals and data centers. This type of transformer employs specially designed winding structures to effectively isolate the input and output circuits, preventing electrical interference and hazards, thus ensuring the normal operation of electrical equipment.

4.Fire-Resistant Dry-Type Transformers

Fire-resistant dry-type transformers are specifically designed for environments with high fire protection requirements, widely used in special industries such as chemical plants and flammable/explosive locations. These transformers use special fire-resistant materials and designs to minimize the impact of fire on the power system in the event of a fire, enhancing the safety of the distribution system.

With their unique structural features and diverse forms, dry-type transformers play an indispensable role in the field of electricity. Their superior safety, environmental friendliness, and ease of maintenance make dry-type transformers increasingly the preferred type in modern power systems. As technology continues to advance and the demand for electricity grows, dry-type transformers will have a broader application prospect in future development. Therefore, in-depth research on the structural features and forms of dry-type transformers will be of significant importance for their optimized design and application promotion.