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Oil-immersed transformer pressboard spacers are structural insulating components manufactured from high-quality electrical insulation pressboard. They are primarily installed between transformer windings or between windings and other insulating structures to maintain the specified insulation clearances, form cooling oil ducts, and provide essential mechanical support for the windings.
These spacers are typically made from high-purity cellulose-based electrical insulation pressboard. Through cutting, grooving, pressing, and other customized machining processes, the material can be manufactured into products with different thicknesses, widths, lengths, and cross-sectional shapes to meet specific transformer design requirements.
In oil-immersed transformers, pressboard spacers are not only part of the insulation system but also influence winding heat dissipation, mechanical stability, and long-term operational reliability.
Provides reliable solid insulation when the material meets the specified requirements and is used under appropriate operating conditions.
When properly positioned, the spacers create channels between windings to facilitate transformer oil circulation.
Helps maintain the required spacing between windings and withstand mechanical loads generated during normal operation and short-circuit conditions, within the design limits.
Manufactured from electrical insulation materials suitable for oil-immersed transformers and compatible with the required oil impregnation and drying processes.
Can be manufactured to specified dimensions and shapes based on customer drawings, samples, or technical specifications.
The actual performance of pressboard spacers depends not only on the pressboard material itself but also on moisture content, density, compressive properties, dimensional stability, machining quality, drying treatment, and the overall insulation system design.
Installed between winding discs or coil layers, these spacers maintain the required spacing and form radial or axial cooling oil ducts. Transformer oil flows through these ducts to remove heat generated by the windings during operation.
When incorporated into an appropriate design, pressboard spacers work together with insulation cylinders, insulating barriers, and other components to maintain the specified distance between windings and help meet electrical field distribution and insulation coordination requirements.
During operation, transformer windings are subjected to clamping forces and electrodynamic forces generated by short circuits. Pressboard spacers provide the mechanical support required by the design, helping reduce the risk of winding deformation and changes in oil duct dimensions. Compressive strength and dimensional stability are particularly important considerations.
Pressboard spacers are used in oil-immersed distribution transformers, power transformers, and other liquid-immersed electrical equipment that incorporates cellulose-based solid insulation systems.
Spacer designs may vary significantly depending on transformer capacity, voltage rating, winding configuration, and overall insulation structure.
ZTelec Group provides electrical insulation pressboard and related insulating components for internal transformer insulation structures.For transformer pressboard spacer requirements, we can assist in confirming material grades, dimensional specifications, and machining solutions based on customer drawings, samples, or technical specifications. For projects requiring coordinated components such as insulation cylinders, barriers, and end rings, we can also discuss suitable materials and manufacturing requirements in accordance with the specific structural design.
By working closely with customers to understand their transformer designs and application requirements, ZTelec Group aims to provide suitable pressboard spacer solutions that support reliable insulation performance, effective oil circulation, and long-term transformer operation.
