What are the transformer losses?

Transformer losses have two sources-copper loss and magnetic loss. Copper losses are caused by the resistance of the wire (I2R).

Magnetic losses are caused by eddy currents and hysteresis in the core.

Copper loss is a constant after the coil has been wound and therefore a measurable loss.

Hysteresis loss is constant for a particular voltage and current.

Eddy-current loss, however, is different for each frequency passed through the transformer.

The major losses occurs in the two parts of transformer.

  1. Core – [Eddy current & Hysteresis loss]-- Constant loss does not depend on load
  2. Winding - I^2 R loss - Caused by current flowing in the winding( Variable loss)