The tapping in an auto transformer is used to:
regulate voltage output
In an auto-transformer:
- A single winding with multiple tap points serves as both primary and secondary.
- The tapping allows selection of different output voltage levels by changing the point where the secondary is connected.
- Purpose: Regulate (adjust) voltage output — e.g., variac (variable auto-transformer) for smooth voltage adjustment.
Tapping does NOT reduce insulation (auto-transformers have less insulation than two-winding types), does NOT increase magnetic losses, and does NOT separate windings (they are intentionally connected).
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