No-Load Loss
Power consumed when energized but not supplying load, consisting of core losses (hysteresis + eddy currents).
No-load loss (core loss) is power consumed at rated voltage/frequency with secondary open. Consists of hysteresis and eddy current loss, plus small excitation I2R.
Constant regardless of load. Over 30-40 years energized 24/7, represents significant cost. 1,000 kVA with 1.5 kW = 13,140 kWh/year loss.
Modern designs achieve 40-70% lower through premium steel, step-lap construction, amorphous core technology.
QDTB offers standard, low-loss, and ultra-low-loss (amorphous) options. Efficiency comparison helps select optimal level.
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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.
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.
Loss Evaluation
A financial methodology assigning monetary value to transformer losses for optimal lifetime economic selection.
More Terms Starting with “N”
Neutral Point
The common connection point of a star (wye) winding where the three-phase voltage vector sum equals zero.
NEMA Rating
Enclosure protection ratings for electrical equipment specifying protection against environmental hazards.
Nameplate Rating
Manufacturer's certified specifications on the transformer nameplate defining all critical parameters.
Network Protector
An automatic switching device on secondary network systems preventing reverse power flow from distributed generation sources.
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.
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.
Related Calculators
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