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Agrounding transformer must handle the unbalanced load on the circuit aswell as the duty during line-to-ground faults.Grounding transformers are alsoused whereutilities need a ground source during abnormal conditions.
GroundingTransformers are designed for providing an artificial neutral point forungrounded three phase power systems.
Duringthe line-to-ground faults, grounding transformers provide an easy path toground faults to limit the fault currents and transient overvoltages.
Groundingtransformers normally carry short-circuit ground current until the circuitbreaker clears the fault. Therefore, they have short time ratings.
ThekVA rating of a earthing transformer depends on the normal line to neutralvoltage and the fault current value for a specified time, such as seconds tominutes.