Why current transformer secondary side should be shorted

FAQ | Mar 18,2023

A current transformer (CT) is a type of transformer that is used to measure or monitor electrical current. The primary winding of a CT is connected to the electrical circuit carrying the current to be measured, while the secondary winding is connected to an ammeter or other measuring device.

The secondary side of a current transformer should be shorted when the CT is not in use to prevent an open circuit condition. If the secondary side is left open, the CT can generate a dangerously high voltage, which can damage the CT or any connected equipment, and can also pose a safety hazard to people working on the circuit.

Shorting the secondary winding of a CT ensures that any current induced in the transformer due to the magnetic field generated by the primary winding is dissipated within the winding itself, without generating any voltage. This prevents any potential damage to the CT or other equipment, and ensures that accurate measurements can be made when the CT is in use.

It is important to note that the secondary side of a CT should only be shorted when the CT is not in use, as shorting the secondary side while the CT is in operation can cause damage to the CT and connected equipment.

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