Answer / shibuss

both losses are occurred in ac
If the primary of a transformer is energized it create a
magmatic flux which linked with secondary and the core. This
flux will induce an EMF in the secondary winding and also in
the core. Since the core of the transformer forms a closed
circuit this EMF will cause a current to flow through the
core known as eddy current and hence the eddy current loss.
In ac system direction of the current is reversed in every
half cycle this will cause the magnetization of the core to
reverse in each half cycle and the loss due to this
continuous magnetic reversal termed as hysteresis loss

Answer / jon

Hysteresis loss
is When the magnetic field through the core changes, the
magnetization of the core material changes by expansion and
contraction of the tiny magnetic domains it is composed of,
due to movement of the domain walls. This process causes
losses, because the domain walls get "snagged" on defects in
the crystal structure and then "snap" past them, dissipating
energy as heat. This is called hysteresis loss. It can be
seen in the graph of the B field versus the H field for the
material, which has the form of a closed loop. The amount of
energy lost in the material in one cycle of the applied
field is proportional to the area inside the hysteresis
loop. Hysteresis loss increases with higher frequencies as
more cycles are undergone per unit time.While the Eddy
current loss
The induction of eddy currents within the core causes a
resistive loss. The higher the resistance of the core
material the lower the loss. Lamination of the core material
can reduce eddy current loss, as can making the core of a
magnetic material nonconductive.

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