Grounding transformer

[1][2] Grounding transformers are part of an earthing system of the network.

They let three-phase (delta connected) systems accommodate phase-to-neutral loads by providing a return path for current to a neutral.

[2][4] Neutral grounding transformers are very common on generators in power plants and wind farms.

[2] Neutral grounding transformers are sometimes applied on high-voltage (sub-transmission) systems, such as at 33 kV, where the circuit would otherwise not have a ground; for example, if a system is fed by a delta-connected transformer.

The grounding point of the transformer may be connected through a resistor or arc suppression coil to limit the fault current on the system in the event of a line-to-ground fault.