What is required at the Xo terminal of a transformer?

At the Xo terminal of a transformer, it is essential that it is bonded and grounded. This requirement is in place for safety reasons and is crucial for effective operation. The Xo terminal usually represents the neutral point in a transformer, particularly in three-phase systems. Bonding this terminal helps to ensure that it is at the same electrical potential as the ground, providing a reference point for the system. Grounding also helps to protect against overvoltages and fault conditions, reducing the risk of electrical shock or fire hazards.

In addition, proper bonding and grounding of the Xo terminal can enhance the relay protection schemes in the system. It helps to ensure that protective devices operate correctly in the event of a fault, which is critical for preventing extensive damage to equipment and maintaining safety in industrial electrical systems. Having the Xo terminal adequately connected to ground helps to maintain system stability and facilitate the effective clearing of ground faults.