Hysteresis Loss
Energy lost in core steel from repeated reversal of magnetic domains each AC cycle, a component of core loss.
Hysteresis loss is one of two core loss components (with eddy current loss. Occurs from repeated magnetic domain reversal each AC cycle, dissipating energy as heat.
Depends on B-H loop area, flux density, frequency. Steinmetz equation: Ph = Kh x f x Bmax^n. Modern GOES has narrow loop, significantly reducing loss vs. older materials.
Hi-B and domain-refined steels reduce further 20-40%. Combined with thin lamination eddy current minimization = lowest possible no-load losses.
QDTB uses premium grain-oriented steel including domain-refined grades. Our amorphous transformers virtually eliminate hysteresis loss.
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.
Eddy Current
Circulating currents induced in conductive materials by changing magnetic fields, causing energy losses in transformers.
Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
Efficiency Class (IE1-IE4)
International classification for transformer energy efficiency, IE1 (standard) to IE4 (premium) with progressively lower losses.
More Terms Starting with “H”
Harmonics
Integer multiples of fundamental frequency from non-linear loads, causing increased transformer losses and overheating.
Hot-Spot Temperature
The highest temperature within transformer winding insulation, determining aging rate and loading capability.
HV/LV Bushing
High-voltage and low-voltage insulated conduits for transformer winding connections through the grounded tank.
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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