Key Insulation Materials for Dry-Type Transformers: Performance and Application

Apr 13, 2026

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With the increasing demand for energy conservation and environmental protection in global power systems, China Low-loss Energy-efficient Dry-type Transformer has become a hot product in the international market, and its insulation material selection and application have also attracted widespread attention. Meanwhile, professional F Class Insulation Dry Type Power Transformer manufacturers like VKE Transformer have been continuously optimizing insulation solutions to enhance product performance and meet strict international standards.

 

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Epoxy Resin Cast Coil 1
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Epoxy Resin Cast Coil 2
 

 

The common insulation materials for dry-type transformers mainly include epoxy resin, Nomex paper, DMD composite paper and epoxy glass fiber laminates, each with unique performance characteristics to adapt to different application scenarios. Among them, epoxy resin is widely used in cast-resin dry-type transformers due to its excellent dielectric strength, moisture resistance and mechanical bonding performance. It can fully encapsulate the windings, effectively isolate moisture and dust, and ensure the transformer operates stably in harsh environments.VKE Transformer also takes this material as a key choice for China Low-loss Energy-efficient Dry-type Transformer, as it helps reduce energy loss and improve operational efficiency.

 

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Nomex Paper

 

Nomex paper, a high-performance aromatic polyamide material, is famous for its excellent high-temperature resistance and flame retardancy, which can withstand long-term operation at 180℃ (H-class insulation) and does not support combustion, greatly improving the safety of dry-type transformers. It is often used in high-load and high-safety-requirement scenarios such as high-rise buildings and hospitals. For F Class Insulation Dry Type Power Transformer manufacturers, Nomex paper is also an important material for producing high-quality F-class insulation transformers, as it can meet the thermal stability requirements of F-class insulation (155℃) and ensure long service life.

DMD Composite Paper

 

DMD composite paper, a three-layer composite material composed of polyester felt and polyester film, is a cost-effective choice for medium and low-voltage dry-type transformers. It combines the mechanical toughness of polyester felt and the high dielectric strength of polyester film, with good flexibility and impregnation performance, suitable for inter-layer insulation and lead insulation of windings. This material is widely used in China Low-loss Energy-efficient Dry-type Transformer, as it can reduce production costs while ensuring insulation performance, realizing the balance between energy conservation and cost-effectiveness.

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Epoxy Glass Fiber Laminates

 

Epoxy glass fiber laminates, made of epoxy resin and glass fiber cloth, have high mechanical strength and dimensional stability, and are often used as insulating supports and structural components of transformers. They can bear certain mechanical stress and ensure the structural stability of the transformer during operation. VKE Transformer, as a professional F Class Insulation Dry Type Power Transformer manufacturer, usually selects appropriate insulation materials according to product specifications and application scenarios, and strictly tests the insulation performance to ensure that the products meet IEC 60076 and other international standards.

 

 

In conclusion, the selection and application of insulation materials directly affect the performance, safety and service life of dry-type transformers. With the continuous development of insulation material technology, China Low-loss Energy-efficient Dry-type Transformer will be more optimized in energy conservation and environmental protection, and VKE Transformer, as one of the leading F Class Insulation Dry Type Power Transformer manufacturers, will continue to promote technological innovation, providing more reliable and efficient insulation solutions for the global power industry.