Earthing Transformer

Earthing Transformer

An Earthing Transformer is usually associated with three phase supply systems. Earthing of any electrical system at the source is considered by most countries to be the safer practice with regard to personnel and equipment safety.
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.  

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