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Saturday, March 23, 2019

Size of Neutral Earthing Transformer Excel Calculator


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Earthing transformers are classified as standard reactors. An earthing transformer (neutral coupler) is a three-phase transformer connected to the power system to provide a neutral connection for earthing, either directly or via impedance. The earthing transformers may in addition supply a local auxiliary load.

The earthing transformer creates a neutral point for a network. ZN connection is usually applied. Z connection provides linear and specified zero sequence impedance. YN+d can also be applied.


With the using of this excel sheet we perform the Calculation Size of Neutral Earthing Transformer.

This spreadsheet calculates following:-
  • Total capacitive charging current (It).
  • Neutral earthing transformer secondary current.
  • Required grounding resistor value at primary side (Rp).
  • Required resistance value at secondary side (Rsec).
  • Neutral earthing transformer X/R Ratio
  • Fault current through neutral – single line to ground fault (If)
  • Rating of neutral earthing transformer (P).



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