# How to calculate transformer iron core losses?

How to calculate transformer iron core losses?

The alternating magnetic flux that flows through the transformerâ€™s magnetic core causes iron loss.

To calculate transformer iron core losses, first determine the losses caused by

• Hysteresis and
• Eddy currents

in the core material.

These losses depend on the core material parameters,

• The frequency of the magnetic flux, and
• The maximum flux density.

Hereâ€™s a step-by-step calculation for calculating these losses.

## Hysteresis Loss

The hysteresis loss (Ph) in a transformer core is calculated as:

## Ph = kh Bmaxn f V

Where

The Steinmetz exponent ranges between 1.6 & 2.5 for the majority of core materials.

f represents the frequency of the magnetic flow (Hz).

V represents the volume of core (mÂł).

## Eddy Current Loss

The equation for eddy current loss (Pe) in a transformer core is as follows:

## Pe = kh Bmax2 f 2 t 2 V

Where

t represents the thickness of core laminations (in meters).

f represents the frequency of magnetic flow (Hz).

V represents the volume of the core (mÂł).

## Total Core (Iron) Loss

The total core loss (P core) combines hysteresis & eddy current losses:

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