What are intended primarily to provide a neutral point for grounding purposes?

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Grounding transformers are designed to create a neutral point that can be grounded, giving a solid reference for the system and a path for ground fault current. In many three‑phase installations, especially delta-connected ones, there isn’t a natural neutral. A grounding transformer (often with a zig-zag winding) provides a grounded neutral point that protective relays and equipment can rely on during faults, helping to stabilize voltages and enable isolation of faults. The other options don’t establish a grounded neutral: neutral grounding resistors limit fault current after a neutral exists, voltage regulators adjust voltage levels, and step‑down transformers only reduce voltage without creating a grounded neutral.