What is the effect of leakage flux?

The effect of leakage flux in a transformer is to: Cause voltage drop in winding. Increase copper losses. Decrease copper losses.

What is the main effect of leakage flux on the performance of a transformer?

As leakage flux increases, efficiency of the transformer decreases as a portion of the leakage flux may induce eddy currents within nearby conductive object such as the transformers support structure, and be converted to heat. When represented as inductance, it only represents reactive power loss.

What is secondary leakage flux?

the leakage flux in both windings serves to reduce the output voltage of the secondary; the mutual flux is less than the available primary flux because of primary leakage, and the net flux in the secondary is the mutual flux less the secondary leakage.

What is primary leakage flux?

The magnetic Leakage flux: This leakage flux is produced due to the primary-amp turn ( m.m.f ) existing between point a and b. This leakage flux φL1 completes the magnetic circuit in the portion ( a-b ) . Hence, this flux is known as primary leakage flux and is proportional to the primary ampere-turns.

What is the relation of secondary winding leakage reactance and secondary current impedance?

Clarification: The secondary winding leakage reactance is directly proportional to the secondary circuit impedance. In secondary winding the leakage reactance is reduced and in turn the secondary circuit impedance is reduced.

What is slot leakage flux?

Slot leakage: This is the flux which follows the path from tooth to tooth across the slots as shown in Fig. 5.45 and in the process links stator/rotor windings only.

What is the effect of leakage inductance?

The leakage inductance causes the main switch current at the device input to vary at a low slope between the rated value and zero and reduces the rate of commutation between output diodes.

What are leakage fluxes and mutual fluxes?

Leakage flux is both undesirable and. In a transformer, the mutual flux i.e. the flux that links both primary coil and secondary coil, is a little less than 100\%. There is some flux which links only with the primary coil, but not with the secondary coil.

What is the relation of secondary winding leakage reactance and secondary circuit impedance?

5. What is the relation of the secondary winding leakage reactance and secondary circuit impedance? Clarification: The secondary winding leakage reactance is directly proportional to the secondary circuit impedance.

What is leakage flux in induction motor?

The Leakage flux in an Induction motor is basically due to the air gap between the stator and rotor which links to either stator winding or rotor winding but not links to both windings. The presence of an air gap between the stator and rotor of an induction motor increases the reluctance of the magnetic circuit.

How leakage flux depends on load current?

The voltage drop caused by leakage flux is proportional to the load current. The greater the load current, the greater the magnitudes of both the primary and secondary ampere-turns, and hence the greater the respective leakage fluxes in both primary and secondary windings.

Why are the leakage flux represented by an inductive reactance?

Magnetic leakage This leakage flux does not link with both the windings, and hence it does not contribute to transfer of energy from primary winding to secondary winding. Hence, leakage flux produces an effect equivalent to an inductive coil in series with each winding. And due to this there will be leakage reactance.

What is leakage flux in a transformer?

In usual operation of a transformer the flux is to pass through the magnetic core structure. But some local flux is also generated in the current carrying primary and secondary windings. This flux is called the Leakage flux.

Why does leakage flux not transfer energy from primary winding to secondary?

This leakage flux does not link with both the windings, and hence it does not contribute to transfer of energy from primary winding to secondary winding. But, it produces self induced emf in each winding. Hence, leakage flux produces an effect equivalent to an inductive coil in series with each winding.

What is the leakage flux of a magnetic circuit?

This leakage flux φL1 completes the magnetic circuit in the portion ( a-b ) .Hence, this flux is known as primary leakage flux and is proportional to the primary ampere-turns. This flux φL1 is in time phase with primary current I1 and induces an e.m.f eL1 in primary winding only.

What is the effect of leakage reactance on voltage regulation of transformer?

The leakage reactance cause voltage drop in primary and secondary of the transformer, hence transformer voltage regulation gets deteriorated with increased leakage reactance. Increased transformer current with high leakage reactance cause more copper losses in the transformer. The efficiency of transformer lowers with increased leakage reactance.