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L-profiles and frames made from pre-compressed pressboard are suitable for use as lead frames in liquid-filled power, distribution, and traction transformers. 

High purity, mechanical strength, and oil impregnability make the components optimally adaptable to the electrical field conditions in the transformer. In areas with high field strength, the shape retention and good dielectric properties of these components prove their worth. The excellent mechanical properties of the insulation material provide the required safety in the event of a short circuit.

These insulation components are produced using special processing procedures, which guarantee high compaction and dimensional stability. 


  • L-profiles and frames: angles
  • Frames: block strips

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
  • Material excellence
  • Advanced technology to scan the quality of pressboard
  • Approved supplier to major utilities worldwide
  • Global footprint

Product scope

  • Power, distribution and traction transformers
  • Insulation class A 105°C according to VDE 0530 Part 1
  • 100% sulfate pulp
  • Natural-colored
  • Made of Figeholm Elboard® HD
  • High purity and high oil absorption
  • Low shrinkage and compressibility
  • Good compatibility with liquid dielectrics
  • According to IEC 641-1 Type B 3.1

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