When B is the flux density, then eddy current loss varies as-

Losses in the transformer

Core Losses Or Iron Losses

• Eddy current loss and hysteresis loss depend on the magnetic properties of the material used for the construction of the core. So, these losses are also known as core losses or iron losses.
• Eddy's current loss: \(\rm W_e=kB_{max}^2f^2t^2V\)
• Hysteresis loss: \(\rm W_e=kB_{max}^{1.6}fV\)

Copper Loss

• Copper losses are due to the resistance of the wire in the primary and secondary windings and the current flowing through them.
• These losses can be reduced by using wire with a large cross-sectional area in the manufacturing of the coils.
   

Stray Loss

• The reason for the types of loss is the occurrence of the leakage field. When compared with copper and iron losses, the percentage of stray losses is less, so these losses can be neglected.
   

Dielectric Loss

• The oil of the transformer is the reason for this loss. Oil in a transformer is an insulating material. When the oil in the transformer deteriorates then the transformer’s efficiency will be affected.