Dry-Type Transformer Iron Core Structure and Performance
In modern power systems and industrial applications, dry-type transformer iron core are widely adopted for their safety, eco-friendliness, and low-maintenance advantages. As the “heart” of these transformers, the iron core directly determines efficiency, noise levels, and operational longevity. For buyers and end-users, understanding the Magnetic core design, materials, and performance benefits is critical for optimizing investment returns. This article explores the iron core structure, material innovations, manufacturing processes, and practical value, empowering you to make informed purchasing decisions.
Basic structure and function of Dry-Type Transformer Iron Core
The iron core is located at the core of the dry-type transformer and is the main component of the transformer magnetic circuit. It is mainly composed of iron core column and iron yoke, and is responsible for the transmission of magnetic flux and power conversion. It determines the key performance indicators of the transformer such as no-load loss, load loss, temperature rise and noise.
function: High-quality iron core can effectively reduce energy consumption and improve the operating efficiency and reliability of the transformer.
Core Material Working Principles
High Permeability & Eddy Current Control: Silicon steel laminations enhance electromagnetic induction, while insulated coatings block eddy current paths, reducing iron losses by 20-40%.
Alternating Flux Optimization: Grain-oriented steel aligns magnetic domains, improving response to alternating flux (Φ=Φm sin ωt) for precise voltage regulation.
Hysteresis Loss Reduction: Cold-rolled processing minimizes lattice defects, shrinking hysteresis loop area and cutting no-load losses by 15-30%.
Dry-Type Transformer Iron Core vs Other Transformer Cores
| Feature | Dry-Type Iron Core | Oil-Immersed Iron Core | Amorphous Alloy Iron Core |
|---|---|---|---|
| Material | Insulated grain-oriented silicon steel | Non-insulated hot-rolled steel | Ultra-thin amorphous alloy (0.03mm) |
| Insulation | Epoxy/PET encapsulation (fire-resistant) | Oil-dependent, periodic maintenance | Multi-layer high-temp insulation |
| Cooling | Air-cooled (no oil leakage risk) | Oil circulation with radiators | Passive convection (lower efficiency) |
| Efficiency | 20-40% lower no-load loss vs. oil-immersed | High overload capacity | 60-80% lower no-load loss vs. steel |
| Applications | High-rises, subways, data centers | Outdoor substations, industrial parks | Renewable energy, low-load scenarios |
Core manufacturing process and innovation
Adopt advanced longitudinal shearing, transverse shearing, stacking and other automated equipment to ensure the core cutting accuracy and stacking quality. Bevel joints, full bevel joints and other processes can effectively reduce magnetic flux leakage and noise. Strictly control burrs, flatness and dimensional tolerances to improve the overall performance of the core.
- Precision Cutting: Laser-guided slitting and stacking ensure burr-free edges (≤0.02mm) and 45° fully staggered joints.
- Automation: Robotic stacking systems achieve ±0.1mm dimensional accuracy, boosting consistency.
- R&D Collaboration: Partnerships with universities optimize core designs for niche applications.
Dry-Type Transformer Iron Core insulation and safety performance
The cores are isolated with high-performance insulation materials to prevent short circuits and leakage.
The insulation structure design complies with international safety standards and improves the equipment’s ability to withstand breakdown.
High-grade insulation materials (such as PET F grade) ensure long-term safety and stability.
Good insulation performance helps extend the overall life of the transformer and reduce maintenance frequency.
The actual value of core performance to buyers
High-quality core can significantly reduce transformer no-load loss and operating noise, saving electricity expenses.
Energy saving and consumption reduction, environmental protection and low noise, meeting the requirements of green building and industrial energy saving.
Maintenance-free, low failure rate, reducing later operation and maintenance costs.
Customized design can be carried out according to customer needs to adapt to different application scenarios (such as high-rise buildings, subways, factories, etc.).
Stable raw material supply chain guarantees delivery time and improves purchasing experience.
The core is the defining component of a dry-type transformer, its quality directly determines the overall performance and service life of the transformer. Prioritize suppliers using high-grade materials (e.g., HiB steel), advanced automation, and rigorous QA testing. A well-designed core not only slashes operational costs but also future-proofs your infrastructure.
Choosing a manufacturer with mature core manufacturing technology and a strict quality control system can not only provide high-efficiency, energy-saving, and low-noise products, but also save a lot of costs in subsequent operation and maintenance.
Ready to optimize your power systems? Explore our core solutions contact our anna@rooqcn.com for a tailored proposal. Let’s build a safer, greener, and more efficient grid together.
