6. Primary Winding Tap Information A device that adjusts the transformer's turns ratio to regulate output voltage by selecting different tap points on the winding. • Typically, ±2 × 2.5% Tap Changer – Four Taps from +5% to -5% • Manually or mechanically adjusted (e.g., via a dial or switch) when the transformer is de- energized (disconnected from power)
Lower cost than on-load tap changers Requires transformers to be offline, causing service interruptions - Not suited for frequent or dynamic voltage adjustments - Manual operation requires trained personnel maintenance - Reliable for stable load applications Works without connection changes. Adjusts primary voltage input internally reducing or increasing top for turns ration No direct impact on LV bushings (2, 3, or 4), which determine secondary voltage output configuration (e.g., 120/240 V for 3 LV bushings)
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