WAZIPOINT Engineering Science & Technology: Magnetic Leakage of a Transformer Breaks Ideal Characteristic

## Wednesday, March 3, 2021

### Magnetic Leakage of a Transformer Breaks Ideal Characteristic

 Fig-1: Magnetic Leakage of Transformer

## How does magnetic flux determine the ideal transformer is not possible in practice?

Generally, it is assumed as our elementary knowledge about the transformer theory that the flux linked with the primary winding is also linked to the secondary winding.

But a practical transformer cannot link all the fluxes to the secondary windings that is linked at the primary. In simple all primary flux is not possible to transfer into secondary windings, some fluxes will be lost which is known as leakage flux.

More details about the transformer magnetic leakage:

## Core Type and Shell Type Transformer Basic

### Classification of Transformer Flux Line

The flux lines in the transformer operation can be classified into two types according to their nature.

1. Mutual flux
2. leakage flux

#### Mutual flux

This is the number of fluxes that are generated on the supply side and transferred to the load side by means of electromagnetic induction. The supply side and the load side are magnetically coupled with this static device. Due to the presence of mutual flux alternating EMF is induced on the load side which causes the load current to flow. This mutual flux plays the main principle of the operation of a transformer.

#### Leakage flux

In the above picture, the primary side leakage fluxes are denoted as ФL1, Ф1 , and in secondary side leakage fluxes are ФL2, Ф2 . this function of the leakage flux is to reduce the mutual flux in the core of the transformer so that increase in leakage flux in a transformer reduces the overall efficiency of it. So the leakage reactance of a transformer is made high to reduce the leakage flux density As the magnitude of the leakage ﬂux increases, the magnitude of ﬂux in the core decreases. Leakage ﬂux increases considerably as the currents in the windings increase. So the leakage flux has to be kept as low as possible.

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