Clamping Rings

Structural support for
windings in power transformers

Clamping rings are essential to the mechanical integrity of power transformers, applying the necessary axial pressure to secure windings in place. Typically donut-shaped, these components are engineered to maintain structural strength under short-circuit conditions and ensure long-term winding stability.

Weidmann manufactures clamping rings using polyester resin-bonded laminated Transformerboard – a material offering consistent mechanical properties, excellent dielectric performance, and superior dimensional stability compared to traditional wood. Unlike wood, it also avoids the release of acids during drying, enhancing long-term reliability. Drying holes Ø 10 mm, connected by slots are applied on clamping rings to improve the drying and impregnation. 

At higher voltage levels, where electrical strength is critical, laminated Transformerboard provides a highly stable and homogenous insulation material, making it the preferred choice for demanding transformer designs.