I-beams for dry-type transformers

I. Product Introduction
Dry-type transformer I-beam support bars, also known as I-beams, traction bars, or ventilation bars, are insulating support profiles integrally formed through a continuous pultrusion process. The core is made of alkali-free glass fiber impregnated with thermosetting resin (such as epoxy or vinyl ester resin). The I-beam structure is adapted to the internal installation space and stress requirements of dry-type transformers. The surface is smooth and free of defects such as bubbles and cracks. Temperature resistance grades include F (155℃), H (180℃), and C. Various specifications are available, with common I-beam sizes including 68mm, 88mm, 1010mm, and 1620mm. Custom sizes can also be made to meet customer needs, adapting to the production of dry-type transformers of different power and specifications.

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Description
Applications
Parameter

II. Product Performance
1. Excellent Mechanical Strength: Bending strength and compressive strength are both ≥200MPa, tensile strength can reach up to 900MPa, strong impact resistance (impact strength of unnotched simply supported beam ≥90KJ/m²), capable of stably bearing the weight of the coil and the electrodynamic forces during operation, providing reliable support. 2. Outstanding Insulation and Electrical Performance: Insulation resistance ≥1.0×10¹²Ω under normal conditions, and still ≥1.0×10¹¹Ω after immersion in water for 24 hours; electrical strength in transformer oil at 90℃ ≥10KV/mm, arc resistance ≥180s, tracking resistance ≥600V, effectively isolating coil potential and preventing insulation failure.
3. Good Heat Resistance and Environmental Adaptability: F/H grade temperature resistance standard, long-term operating temperature up to 155℃-180℃, heat distortion temperature ≥240℃, resistant to high-temperature aging; water absorption ≤20mg, moisture-proof and corrosion-resistant, stable performance in humid and complex environments, requiring no additional protection.
4. Other Advantages: Flame retardancy meets standards, complying with high-voltage electrical safety requirements; smooth surface for easy processing, allowing for quick cutting and assembly, adaptable to automated production processes, and contains no metallic components, thus not affecting the transformer's electromagnetic performance.

About

Zhejiang Yuanda Fiberglass Mesh Co.,ltd.

Zhejiang Yuanda Fiberglass Mesh Co., Ltd. was founded in 2000. It is a technology-oriented manufacturing enterprise focusing on the new materials field, specializing in the research and development and production of composite reinforcing materials, insulating materials, and related intelligent equipment. Committed to providing professional and reliable products and services to customers worldwide. The company is located in the Yangtze River Delta economic Circle of China, close to Ningbo Port and Shanghai Port. The unique geographical location has brought convenience to the company's import and export business. The company covers an area of nearly 33,000 square meters and has modern standard workshops.
The three core business segments
1. Composite material fiber bars and fiber bar mesh sheets (GFRP), as well as supporting production equipment.
2. Special interlayer insulating materials for power transformers and motors.
Iii. Alkali-resistant fiberglass mesh fabric and alkali-resistant emulsion for construction.

For the past 25 years, Zhejiang Yuanda Fiberglass Mesh Co., Ltd. has been deeply engaged in the field of new materials, deepening technological innovation and industrial collaboration, continuously expanding the application scope of its products, and has won wide recognition from customers. In the future, we will be committed to building a leading domestic supplier of composite new materials and injecting continuous impetus into the high-quality development of the industry.

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