Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Core loss (no-load loss) is power dissipated in a transformer's magnetic core when energized without load. Consists of hysteresis loss and eddy current loss.
Hysteresis loss from repeated magnetic domain reversal each AC cycle. Eddy current from circulating currents in laminations. Minimized by thin, insulated grain-oriented silicon steel.
Constant regardless of load—depends only on voltage and frequency. Represents 24/7 energy consumption over 30+ years. A 1 kW reduction saves ~8,760 kWh/year.
QDTB optimizes cores using premium steel and computer-aided design. Our amorphous alloy transformers achieve 60-70% lower core loss. See energy efficiency standards comparison.
Related Terms
Copper Loss
Power lost as heat in transformer windings due to electrical resistance, proportional to the square of load current.
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
No-Load Loss
Power consumed when energized but not supplying load, consisting of core losses (hysteresis + eddy currents).
Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
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.
Copper Loss
Power lost as heat in transformer windings due to electrical resistance, proportional to the square of load current.
Current Transformer
An instrument transformer producing secondary current proportional to primary current, for measurement and protection.
More in “Performance Parameters”
Copper Loss
Power lost as heat in transformer windings due to electrical resistance, proportional to the square of load current.
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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