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Earthing transformers

Earthing transformers

An earthing transformer is usually associated with three-phase supply systems

On a three-phase system, the neutral would be earthed either directly or through some limiting impedance / resistance. When the neutral point is not available or does not exist with a delta secondary winding of the transformer, a neutral point needs to be created. This is the purpose of the earthing transformer, which could consist of a zig-zag winding, or a two-winding star delta transformer where the star winding of correct voltage supplies an accessible neutral point when connected to the supply system.

Product scope

  • Up to 2 MVA
  • High voltage up to 36 kV
  • Low voltage up to 0.69 kV
  • Classes E2, E3, C2, F1
  • Frequencies: 50 Hz, 60 Hz and 16 2/3 Hz
  • Cooling: AN / ANAN / ANAF
  • Insulation system temperature: F and H
  • Partial discharges <10 pC
  • Protection degree: IP00 - IP54

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  • Powerful engineering and Hitachi ABB Power Grids design
  • Customized solutions for all customers
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Earthing transformers