What is a Ground Bank?

• A. Installed on true Delta systems with relation to ground. Take the high amount of imbalance of an entire circuit safely to ground usually installed at substations.
• B. A type of transformer
• C. A safety harness
• D. A lighting device

Answer: (B)

Ground banks are grounding transformers used to create a neutral grounding point for a delta-connected system. In a delta system there isn’t a natural neutral, which makes it harder to provide a solid path to earth for fault currents. A ground bank uses transformer windings arranged to form a neutral point that is bonded to earth, giving a controlled, low-impedance path for ground faults. Because this relies on magnetic coupling between windings to establish the neutral, it’s a transformer-based device, not a resistor, harness, or lighting device. Substations install ground banks to ensure reliable ground fault protection and maintain system stability.