In the rapidly developing modern power system, dry transformer (Dry Transformer) has gradually become the first choice equipment in many fields with its unique advantages. As a transformer that uses solid insulating materials instead of liquid insulating media (such as oil), dry-type transformers not only have the functions of traditional transformers, but also achieve significant improvements in safety, environmental protection and ease of maintenance.

The core structure of dry transformer includes iron core and windings. The core is usually made of high-quality cold-rolled grain-oriented silicon steel sheets. The 45-degree fully oblique joint design allows magnetic flux to pass along the joint direction of the silicon steel sheets, effectively reducing energy loss. Windings come in many forms, such as winding, epoxy resin plus quartz sand filled casting, glass fiber reinforced epoxy resin casting, etc. The choice of these forms mainly depends on the application environment and performance requirements.

The working principle of dry-type transformers is similar to that of oil-immersed transformers, both of which achieve voltage conversion through the principle of electromagnetic induction. However, due to different insulation media, dry-type transformers need to pay more attention to heat dissipation and protection in design and manufacturing. Common cooling methods include natural air cooling (AN) and forced air cooling (AF). The former is suitable for long-term continuous operation at rated capacity, and the latter can increase the output capacity by 50% when needed, and is suitable for intermittent overload or Emergency overload operation.

Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, and CNC machinery and equipment. Its significant advantages are:

High safety: Dry-type transformers do not contain flammable and explosive insulating oil, so they have higher fire resistance and can be run directly in load centers, greatly reducing fire risks.
Environmentally friendly and pollution-free: The oil-free design means that the transformer will not cause pollution to the environment and ecosystem during its entire life cycle, which is in line with the development trend of green energy.
Convenient maintenance: Due to its compact structure and small size, dry-type transformers are more convenient to install and maintain, reducing operation and maintenance costs.
High efficiency and energy saving: Using advanced materials and design, dry-type transformers have the characteristics of low loss and low noise, and have significant energy saving effect.
Strong adaptability: Dry-type transformers can be customized according to different needs, such as open type, closed type and pouring type, to adapt to various complex environments.

As the world's requirements for environmental protection and energy efficiency continue to increase, the dry-type transformer market has ushered in unprecedented development opportunities. It is predicted that in the next five years, the dry-type transformer market will grow at a compound annual growth rate of up to 25%, from US$3 billion in 2022 to US$10 billion in 2027. Especially in the residential, commercial and industrial fields, dry-type transformers occupy a dominant position due to their unique advantages.

In terms of technological innovation, the dry-type transformer industry is also constantly exploring new technological routes. For example, the emergence of new products such as brushless excitation dry-type transformers and high-frequency switching power supplies not only improves the performance and efficiency of transformers, but also further promotes the sustainable development of the industry. At the same time, with the widespread application of digital and intelligent technologies, dry-type transformers have also introduced advanced control systems to achieve real-time monitoring and intelligent management of operating status, improving the stability and reliability of the system.