Tap Changer
A device adjusting transformer turns ratio by connecting to different tap points on a winding.
A tap changer adjusts effective turns in a winding by connecting to different points, changing turns ratio and voltage ratio.
Two types: OLTC (operate while energized—essential for continuous regulation) and DETC (require de-energization—for occasional adjustment).
OLTCs: 8-16 positions, 1.25%/2.5% steps. DETCs: typically 2x2.5% or 4x2.5%.
QDTB supplies both options with custom tap ranges. See selection guide for specification guidance.
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Related Terms
On-Load Tap Changer (OLTC)
A device changing transformer tap positions under load without interrupting supply for automatic voltage regulation.
Load Tap Changer (LTC)
A mechanism allowing transformer tap ratio changes while energized and under load for real-time voltage regulation.
Voltage Regulation
The change in secondary voltage from no-load to full-load as a percentage, indicating voltage stability.
Turns Ratio
The ratio of primary to secondary winding turns directly determining voltage transformation ratio.
More Terms Starting with “T”
Transformer
A static device transferring energy between circuits through electromagnetic induction, changing voltage and current levels.
Temperature Rise
The temperature increase of transformer components above ambient at rated load, a key design parameter.
Three-Phase Transformer
A transformer for three-phase power systems with three winding sets on a common core.
Turns Ratio
The ratio of primary to secondary winding turns directly determining voltage transformation ratio.
More in “Components & Accessories”
Bushing
An insulated device allowing a conductor to pass through a grounded barrier while maintaining insulation integrity.
Busbar
A metallic strip conducting electricity within switchgear, transformers, and distribution equipment.
HV/LV Bushing
High-voltage and low-voltage insulated conduits for transformer winding connections through the grounded tank.
Related Calculators
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