A dry-type grounding transformer is in final assembly. This grounding transformer is widely used in the country.
What is a grounding transformer:
A grounding transformer or grounding transformer is an auxiliary transformer used in three-phase power systems to provide a path to ground for ungrounded one-way or delta-connected systems. Grounding transformer is an integral part of the power grid grounding system. They allow three-phase (delta-connected) systems to accommodate phase-neutral loads by providing a path for current to return to the neutral.
Grounding transformers are generally used for:
Provide a relatively low impedance ground wire so that the neutral point of the system is at or near ground potential
When a ground fault occurs again, the size of the transient overvoltage should be limited.
When there is a line-to-ground fault, a ground fault current source is provided.
Allows phase-neutral load connection if required
Zigzag grounding transformer
The most common grounding transformer is a single-winding transformer with a zigzag winding configuration, but you can also create a delta-winding transformer. Neutral grounding transformers are very common on generators in power plants and wind farms. Neutral grounding transformers are sometimes used in high voltage (secondary transmission) systems, such as 33kv, where the circuit would not otherwise be grounded; for example, if the system is powered by a delta-connected transformer. The ground point of the transformer can be connected through a resistor or arc suppression coil to limit the fault current of the system in the event of a line-to-ground fault.