For grounding purposes, when a three-phase system does not have a neutral point, a grounding transformer is used to ground the isolated systems and obtain a neutral point.

The grounding transformer can have a zigzag connection, a star-delta connection or an open-delta connection structure. By displaying a low impedance in the phase-to-ground path, it ensures that the neutral voltage of the system remains at the level of the ground voltage and is the source of zero sequence current. It limits the magnitude of transient overvoltages that occur when an arc fault to ground occurs for any reason. They create measurement points to measure fault currents and serve in unbalanced load situations.

Electrical systems operate under varying and complex voltages. Maintenance is supported in electrical systems, but short circuit faults cannot be avoided. Thanks to the use of a grounding transformer, the potential is dissipated in the event of a fault.

Grounding transformers are an inductive device. They do not carry an active charge.

Grounding transformers; They work for a short time; they can be one or two windings. They work one way. Except for the fault condition, it only has idle losses. Its cost is low. It has a high mechanical and thermal resistance in the event of a short circuit.