TRANSFORMERS:THE VOLTAGE RATIO ACROSS A TRANSFORMER

THE VOLTAGE RATIO ACROSS A TRANSFORMER

The average flux present in the primary winding of a transformer is.

The effect of this flux on the secondary coil of the transformer depends on how much of the flux reaches the secondary coil. Only a portion of the flux produced in the primary coil reaches the secondary coil. Some of the flux lines pass through the surrounding air instead of through the iron core (Fig. 3.7). The leakage flux is the portion of the flux that passes through one of the coils but not the other.

The flux in the primary coil can be divided into two components: a mutual flux, which remains in the core and links both coils (windings), and a small leakage flux, which passes through the primary winding and returns through air, bypassing the secondary winding:

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