Transformer Pressboard

Types of Transformer Pressboard Transformer pressboard […]

Types of Transformer Pressboard

Transformer pressboard is an important material used in the insulation systems of oil-immersed transformers. It is primarily used for electrical insulation, mechanical support, winding separation, oil duct formation, and improving the reliability of the insulation system.

1. Main Types of Transformer Insulation Pressboard

1.1 Electrical Insulation Pressboard

Electrical insulation pressboard is primarily made from high-purity cellulose fibers, typically using unbleached kraft wood pulp as the raw material. It is one of the most widely used solid insulation materials in oil-immersed transformers.

Main applications: Winding end insulation, interlayer insulation, insulating spacers, and support components.

Common keywords: Transformer insulation pressboard, electrical insulation pressboard, transformer insulating board.

1.2 High-Density Insulation Pressboard

High-density insulation pressboard features relatively high density, good mechanical strength, and dimensional stability. It is suitable for insulation structures requiring enhanced mechanical support.

Main applications: Winding supports, insulating barriers, and load-bearing insulation components.

Common keywords: High-density transformer pressboard, high-density electrical insulation board.

1.3 Molded Insulation Pressboard Components

Molded insulation pressboard components are manufactured by forming or machining insulation pressboard into specific shapes. Products include not only flat sheets but also various customized insulation components.

Main products: Insulation rings, angle rings, end rings, spacers, barriers, and customized molded insulation components.

Common keywords: Machined transformer pressboard components, molded transformer insulation components.

1.4 Insulation Pressboard Strips and Oil Duct Spacers

Insulation pressboard can be cut or processed into strips and spacers to form oil ducts between transformer windings or within winding assemblies.

Main applications: Electrical insulation spacing, transformer oil circulation, and heat dissipation.

Common keywords: Transformer pressboard strips, transformer oil duct spacers, transformer insulation spacers.

2. Classification by Manufacturing Process and Structure

Note: These classifications are not mutually exclusive. A product may be classified as high-density, pre-compressed, or thick pressboard at the same time. Actual performance should be verified against the manufacturer’s technical data sheet.

3. Differences Between Transformer Insulation Pressboard and Other Insulation Materials

3.1 Transformer Insulation Pressboard

Insulation pressboard is primarily used in the solid insulation systems of oil-immersed transformers. It can be manufactured into sheets, strips, spacers, and molded insulation components.

3.2 Diamond-Dotted Paper (DDP)

Diamond dotted paper features a surface coated with adhesive dots arranged in a diamond pattern. Under specified heating conditions, the adhesive dots soften or bond, helping secure the insulation layers.

This material is commonly used for interlayer or interturn insulation in transformer windings.

3.3 Crepe Insulation Paper

Crepe insulation paper offers good flexibility and conformability, making it suitable for wrapping transformer leads, conductors, and irregularly shaped insulation areas.

3.4 Electrical Laminated Wood

Electrical laminated wood provides good mechanical strength and electrical insulation performance. It is commonly used for transformer clamping plates, support components, and structural parts.

Unlike cellulose-based insulation pressboard, electrical laminated wood is a wood-based laminated insulation material.

Contact the Manufacturer

Xujue Electrical is a professional manufacturer of transformer insulation materials, specializing in high-quality insulation solutions for oil-immersed transformers and other electrical equipment.

We supply a wide range of products, including transformer insulation pressboard, pressboard strips, winding insulation paper, and customized insulation components. Based on the voltage rating, operating environment, and specific application requirements of different transformers, we provide reliable and consistent insulation materials and tailored solutions.

Contact us today to request free insulation material samples and receive professional product recommendations and customized solutions for your project!