The core Flux in transformer depends mainly on

A. supply voltage
B. supply voltage and frequency
C. supply voltage, frequency, and load
D. supply voltage and load

Answer: B. supply voltage and frequency

Flux in transformer core is given by = V/f = Supply Voltage/Frequency

So The core Flux in the transformer depends mainly on supply voltage and frequency.

The main flux is the flux found in the core at a point not under either the primary or secondary winding, and has been commonly considered as being the flux which causes the secondary induced voltage.

This flux is called leakage flux which will pass through the winding insulation and transformer insulating oil instead of passing through the core.

This phenomenon in the transformer is known as magnetic leakage.

This depends on load current, independent of voltage, frequency, and power factor.

The core flux decreases when the current is increased through the system and increased when the current was decreased through the system. 

By adding a capacitor in parallel with the load, we would be able to reduce the core loss current by 1/3.

The energy transfer in a transformer, is from one winding to another, entirely through magnetic medium it is known as transformer action.

Therefore, transformer action requires an alternating or time-varying magnetic flux in order to transfer power from primary side to secondary side.

Flux leakage is transformers can be minimized by shielding. Core of the transformer is made of soft iron.

The ideal transformer model assumes that all flux generated by the primary winding links all the turns of energy winding, including itself. 

In practice, some flux traverse paths that take it outside the windings. Such flux is termed leakage flux. 

Soft Iron is ferrmagnetic, so it acquires magnetic field when the field is on and release when it is off so, in changing magnetic field it is very good support of field.

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