Zemat logo 2023

Machines for the power industry

  1. Home
  2. Industries and Sectors
  3. Machines for the power industry

Machines for the power industry

Production of insulation components for power transformers requires precise forming, controlled drying, and high dimensional stability at every stage of the process.

Ask for an offer
Machines for the power industry

PRESA – a machine for the power industry

PRESA is a machine designed for the production of insulation components used in power and high-voltage transformers. It enables precise forming of pressboard, combined with simultaneous pressing and controlled drying in a single technological cycle.

The use of high-frequency (HF) technology ensures uniform heating of the entire material volume, resulting in high dimensional stability and repeatability of finished components. This solution is applied wherever machines for the power industry are required to process insulation materials.

The use of the PRESA machine in the power sector includes, among others:

  • production of insulation flanges for transformer coils,
  • forming of insulation components for power transformers,
  • pressboard processing for high-voltage applications,
  • manufacturing of components with high geometric stability.
presa box
Presa

Machines for the power industry in the production of insulation components

Machines for the power industry used in the production of transformer insulation components must meet significantly higher requirements than solutions applied in standard cellulose material processing. Insulation elements for power transformers operate in high-voltage environments and are exposed to temperature, mechanical loads, and transformer oil. Each stage of the manufacturing process has a direct impact on the safety and long-term reliability of the finished device.

In this context, dimensional stability of insulation components is of critical importance. Geometric deviations may lead to local electric field concentrations, which over time increase the risk of damage or transformer failure. For this reason, machines for the power industry must ensure not only precise material forming, but also controlled and uniform drying of the entire component volume.

High-frequency technology as the foundation of the process

In the production of insulation components for power transformers, a key challenge is removing moisture from the material without inducing internal stresses or deformation. Traditional surface-based drying methods can lead to uneven temperature distribution, which negatively affects the geometry of the component after the process is completed.

The use of high-frequency (HF) technology in machines for the power industry enables volumetric heating of the material. Energy acts on the entire pressboard mass, allowing the drying process to proceed uniformly throughout the full cross-section of the formed component. In practice, this means:

  • reduced risk of deformation after completion of the cycle,
  • preservation of repeatable geometric parameters,
  • long-term dimensional stability of insulation components during operation.

Pressboard as an insulation material in the power industry

One of the primary materials processed on machines for the power industry is a type of electrical insulation paper known as pressboard. In power transformers, this material performs both insulating and structural functions, providing separation of live components and stabilizing the winding system.

Pressboard used in the power industry must be characterized by a homogeneous structure, controlled moisture content, and the ability to retain its shape after forming and drying processes. Machines for the power industry designed for pressboard processing must enable precise shaping of the material in its wet state, followed by consolidation without disturbing its internal structure.

For this reason, processes carried out on machines such as PRESA are applied in the production of insulation flanges and other components used in high-voltage applications.

Dimensional stability and production repeatability

In the power industry, not only the quality of an individual component matters, but also the repeatability of parameters across successive production cycles. Machines for the power industry must enable the manufacturing of insulation components with identical geometry, regardless of production batch or machine operating time.

The combination of precise forming and controlled drying within a single technological cycle reduces the number of variables influencing the final result. As a result, consistent quality of insulation components used in power transformers and high-voltage transformers can be maintained.

Practical application of machines for the power industry

Machines for the power industry used in the production of insulation components are an integral part of the technological processes employed by transformer manufacturers. Their role is to ensure repeatability, stability, and quality of components that directly affect the operational safety of power equipment.

Such solutions are applied both in the production of individual insulation components and in more advanced manufacturing systems, where machines operate as part of automated production lines.

The list of possible applications for machines manufactured by Zemat Technology Group is not closed and continues to evolve. Our customers often surprise us with innovative ideas for using the technologies offered by our machines.

We invite you to contact our Sales Department.
Together, we will find the most effective solutions.

Machines can be freely modified or designed from the ground up to match the customer’s vision and specific requirements. The offer is not limited to standalone machines—complex and advanced projects are also delivered, including automated production lines equipped with state-of-the-art industrial automation.

find a machine for yourself

Check how many products can be made on our machines.

Quote request

Do you have any questions or would you like to receive a personalized offer? Please contact us.

technical support

We offer Global Technical Support for our machines. Please contact our Technical Service Department with any questions or issues about our equipment.