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Calendered pressboards

Insulation components and insulation sheets made of pressboard are primarily used in oil-filled power transformers and distribution transformers because of their high purity, mechanical strength and optimum oil impregnability.

Due to a different drying process for calendered boards the shrinkage factors are higher compared to pre-compressed boards. Calendered boards are preferred when a flexible insulation board is required, such as for small angles, barriers or protections. Calendered boards are also used for different insulation applications in liquid-filled distribution transformers like core formers, cooling ducts, barriers and cylinders.

Hitachi Energy produces calendered boards in different densities depending on the application.

Why Hitachi Energy?

  • More than 150 years of experience in insulation
  • Complete range of insulation products for liquid-filled transformers; comprehensive range for dry-type
  • Complete range of insulation products for transformers from 11 kV up to 1,200 kV AC and 800 kV DC
  • Material excellence
  • Global footprint

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