Turns Ratio
The ratio of primary to secondary winding turns directly determining voltage transformation ratio.
The turns ratio = N1/N2. Determines voltage ratio (V1/V2 = N1/N2) and inverse current ratio. For step-down N1 > N2; step-up N1 < N2.
Fundamental design parameter. Actual ratio deviates slightly due to impedance drops. Verified during factory testing (turns ratio bridge, tolerance typically +/-0.5% per IEC 60076).
Also affects reflected impedance (secondary Z appears at primary multiplied by ratio squared).
QDTB verifies with high precision for every transformer during factory testing.
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Related Terms
EMF (Electromotive Force)
The voltage generated by electromagnetic induction in a transformer winding, proportional to flux change and turns.
Tap Changer
A device adjusting transformer turns ratio by connecting to different tap points on a winding.
Vector Group
Standardized designation of transformer winding connections and phase displacement between HV and LV.
More Terms Starting with “T”
Transformer
A static device transferring energy between circuits through electromagnetic induction, changing voltage and current levels.
Tap Changer
A device adjusting transformer turns ratio by connecting to different tap points on a winding.
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.
More in “Electrical Fundamentals”
Apparent Power (kVA)
The total power in an AC circuit combining real (active) and reactive power, measured in kilovolt-amperes (kVA).
Eddy Current
Circulating currents induced in conductive materials by changing magnetic fields, causing energy losses in transformers.
EMF (Electromotive Force)
The voltage generated by electromagnetic induction in a transformer winding, proportional to flux change and turns.
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