I. Core Principle: Electromagnetic Induction and Efficient Energy Conversion
Dry-type transformers operate based on the law of electromagnetic induction, enabling voltage transformation through a core structure composed of primary windings (high-voltage side), secondary windings (low-voltage side), and an iron core . When alternating current flows through the primary winding, it generates an alternating magnetic field in the iron core. This magnetic field is transmitted via a closed magnetic circuit formed by silicon steel laminations, inducing a proportional voltage in the secondary winding according to the turns ratio . The formula below governs this process:
\frac{V_1}{V_2} = \frac{N_1}{N_2}
By adjusting the winding turns ratio, dry-type transformers achieve step-up or step-down functions to meet diverse power demands .
II. Technological Innovations: Breakthroughs in Materials and Design
Optimized Iron Core and Windings
The iron core utilizes high-permeability silicon steel laminations to minimize eddy current and hysteresis losses, significantly improving energy efficiency . Windings are encapsulated with epoxy resin casting technology, forming robust insulation layers that enhance moisture resistance, dustproofing, and heat dissipation .
Oil-Free Cooling System
Replacing traditional oil-immersed designs, dry-type transformers adopt natural air convection or forced air cooling for heat dissipation. Advanced models integrate smart temperature control systems with real-time sensors to monitor winding temperatures and dynamically adjust cooling efficiency .
Eco-Friendly Materials and Processes
Inorganic insulating materials such as epoxy resin and fiberglass replace oil-based media, eliminating leakage risks and aligning with global sustainability goals .
III. Core Advantages: Safety, Efficiency, and Intelligence
Enhanced Safety
The oil-free design eliminates fire and explosion hazards, making it ideal for sensitive environments like hospitals and chemical plants . Epoxy encapsulation further resists lightning surges and short-circuit currents, ensuring long-term reliability .
Energy Efficiency
Dry-type transformers reduce energy losses by 15%-20% compared to oil-immersed counterparts, with minimal maintenance costs due to the absence of oil replacement .
Smart Management
Integrated IoT technology enables remote monitoring, fault prediction, and adaptive regulation, supporting the development of intelligent power grids .
IV. Application Scenarios: Empowering Green Energy Transition
Power Systems: Power distribution networks, substations, and renewable energy integration .
Industrial Sectors: Harsh environments like metallurgy, mining, and high-humidity facilities .
Public Infrastructure: Data centers, rail transit, and medical buildings requiring high reliability and fire safety .
V. Industry Outlook: Market Growth and Technological Evolution
China’s dry-type transformer market is projected to exceed CN¥15 billion in 2025, with an annual growth rate of 8% . Future advancements in high-performance insulating materials and intelligent control systems will drive innovations in lightweight design and extreme weather resistance, solidifying their role in next-generation power systems .
Conclusion
With unparalleled environmental benefits, safety, and efficiency, dry-type transformers are rapidly replacing traditional oil-immersed models, emerging as a cornerstone of global energy transition. As nations advance toward dual-carbon goals, ongoing technological breakthroughs will expand their applications, injecting momentum into the creation of green, intelligent power networks.
Post time: Jun-02-2025
