Pressboard Strips for Oil Duct

Pressboard strips for transformer oil duct are rigid cellulose insulation strips used inside oil-filled transformers to form oil channels, maintain insulation clearance and support winding structures.

These strips are typically made from electrical transformer pressboard and are used between winding layers or structural parts where controlled spacing and oil circulation are required. In transformer construction, they are not simple spacers. 

For transformer manufacturers, good pressboard strips are important because poor dimensional consistency or edge quality can create assembly problems and affect the final winding structure.
Chengrui Insulation supplies pressboard strips for transformer oil duct applications to transformer manufacturers, winding workshops, insulation component processors and industrial distributors. We can provide strips and other pressboard spacers components in standard or custom widths, thicknesses and lengths according to transformer design and production needs.

What Are Pressboard Strips for Transformer Oil Duct?

Pressboard strips are narrow insulation strips cut from transformer pressboard. Their main purpose is to create and maintain oil ducts inside the transformer winding structure.

In practical transformer design, oil circulation is essential for cooling. If the winding structure is too compact without proper oil channels, heat dissipation becomes less effective. Pressboard strips help solve this by creating controlled spacing between winding layers or structural parts.

At the same time, the strips also provide:

• electrical insulation separation

• dimensional spacing

• mechanical positioning

• support for the oil-paper insulation system

This is why pressboard strips are widely used in distribution transformers, power transformers and oil-immersed transformer winding systems.

Main Functions in Transformer Structures

1. Form Oil Ducts

This is the main function. The strips create channels that allow transformer oil to circulate more effectively inside the winding structure.

2. Maintain Insulation Spacing

The strips help keep the required distance between conductors, winding layers or insulation parts.

3. Support Cooling Performance

By helping form regular oil channels, they support internal cooling and heat dissipation.

4. Provide Mechanical Support

Although they are insulation components, they also help stabilize the winding arrangement.

5. Support Assembly Accuracy

Consistent strip dimensions make transformer assembly more efficient and reduce fitting problems in production.

Main Material

The strips are generally made from electrical transformer pressboard, a high-density cellulose insulation material commonly used in oil-filled transformer insulation systems.

Typical material features include:

• good dielectric performance

• compatibility with transformer oil

• rigid structure

• easy cutting into strips and fabricated parts

• suitability for oil-paper insulation systems

Depending on the transformer design, strip grade and density can be selected according to actual application requirements.

Typical Applications

Pressboard strips for transformer oil duct are commonly used for:

• oil duct formation in transformer windings

• winding layer spacing

• interlayer insulation spacing

• insulation support inside oil-filled transformers

• structural strip components in power and distribution transformers

They are especially relevant in transformer designs where controlled oil flow and internal spacing are critical.