Electrically connecting the neutrals of every wye connected transformer and generator to earth is known as what?

• A. Resistance grounding
• B. System grounding a power system
• C. Protective coordination
• D. None of the above

Answer: (B)

Connecting the neutrals of all wye-connected transformers and generators directly to earth establishes a defined reference point and a clear path for fault currents. This arrangement is known as system grounding. By grounding the neutral, the system voltage is stabilized relative to earth, and if a ground fault occurs, fault current has a ready path back to the source. That substantial fault current allows protective relays and breakers to detect and clear the fault quickly, protecting equipment and people.

This differs from resistance grounding, where a resistor sits between the neutral and earth to limit fault current, and from protective coordination, which is about setting protective devices to trip in the right sequence. So the described setup corresponds to system grounding.