Which device provides a neutral point for grounding purposes in a substation?

• A. Grounding Transformers
• B. Lightning Arresters
• C. Regulators
• D. Capacitors

Answer: (A)

The key idea is providing a defined earth reference for fault currents. A grounding transformer, often called a neutral grounding transformer, creates a neutral point for grounding by linking one winding to earth. This establishes a grounded neutral for the substation, allowing any ground faults to funnel current safely to ground and enabling protective relays to detect and clear the fault quickly. The other devices don’t establish a grounded neutral: lightning arresters divert surge energy, regulators adjust voltage, and capacitors affect reactive power—none of them provide the neutral path needed for grounding purposes.