Earthing Transformer 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 or directly.
Can be produce the following types:
Oil-type: up to 36 kV
Dry-type: up to 36 kV
With auxiliary winding on request.
The design can be a transformer with just one winding, which is zig-zag connected. The zero sequence impedance of such a winding is normally quite low, but it can be increased if the purpose of the is to limit the current through the transformer in case of an earth fault somewhere in the power system.