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.
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.
- 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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