Which of the following protects the system in a transformer bank?

In a transformer bank, the concept of a floating neutral is important because it allows for the safe operation of the system under specific conditions. A floating neutral occurs when the neutral conductor is not connected to ground at the transformer, which can help prevent overvoltages and allows the system to continue operating even if one phase is lost. This system configuration can enhance safety in certain scenarios by avoiding ground faults that could lead to equipment damage or unsafe conditions.

In contrast, overcurrent protection primarily safeguards equipment from excessive current, while a grounding electrode system connects the system to ground primarily for safety reasons and fault current management. A voltage regulator controls the voltage supply but does not specifically protect the transformer bank like the floating neutral does. Thus, understanding the role of a floating neutral is essential for ensuring the protection and reliability of transformer bank operations.