Copper Loss
Power lost as heat in transformer windings due to electrical resistance, proportional to the square of load current.
Copper loss (I2R loss or load loss) is power dissipated in transformer windings due to conductor resistance. Unlike core loss, varies with load current squared.
Two components: basic I2R loss and stray losses from eddy currents induced by leakage flux. Stray losses minimized through conductor transposition.
Efficiency optimization balances core loss (constant) and copper loss (variable). Most efficient at 50-70% rated load where they are equal.
QDTB optimizes winding designs using high-conductivity copper and transposition techniques. Our selection guide helps balance cost vs. lifetime loss evaluation.
Related Products
Related Terms
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
Winding Resistance
The DC resistance of transformer windings, measured for loss calculation and connection quality verification.
More Terms Starting with “C”
CCC Certification
China Compulsory Certification (3C mark) required for electrical equipment sold in the Chinese domestic market.
CE Certification
Conformite Europeenne marking required for electrical equipment in the European Economic Area.
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Current Transformer
An instrument transformer producing secondary current proportional to primary current, for measurement and protection.
More in “Performance Parameters”
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
Fault Current
The extremely high current during a short circuit that transformers must withstand mechanically.
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