Earthing Transformers

  • These earthing transformers are used to create a neutral point in a three-phase system, which provides possibility for neutral earthing. 
  • The earthing can be through an arc-suppression reactor, a neutral earthing reactor or resistor are directly in these earth transformers. 
  • These earthing transformers are usually oil immersed and may be installed outdoor. 
  • In cases where a separate reactor is connected between the earth transformer neutral and earth, the reactor and the transformer can be incorporated in the same tank.
  • Neutral earthing transformers are normally provided in 3-phase system, which is without neutral and earth fault protection.
  • Neutral earthing transformer is having zig-zag (interstar) winding to achieve the required zero phase impedance. 
  • In addition an auxiliary winding can also be provided to meet the requirement of auxiliary power supply in these electrical earthing transformers.

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