Q: What is the nature of armature reaction?

The armature reaction flux is constant in magnitude and rotates at a constant speed called synchronous speed. The nature of armature reaction is cross magnetizing when the synchronous generator supplies a unity power factor load. When the generator supplies the leading power factor load the armature reaction is magnetizing. the armature reaction is demagnetizing when the generator supplies the lagging power factor load.

Question 1

What is armature reaction in alternator?

Accepted Answer

The effect of armature flux on the main field flux, thereby distorting the effect of the main flux is called armature reaction in alternator or synchronous generator.

Question 2

What are the main effects of armature reaction?

Accepted Answer

The armature reaction in alternator causes distortion in the main field flux, thereby increasing or decreasing the resultant flux. The distortion of the field flux causes three effects such as cross magnetizing, demagnetizing and magnetizing effect.

Question 3

What is the nature of armature reaction?

Accepted Answer

The armature reaction flux is constant in magnitude and rotates at a constant speed called synchronous speed. The nature of armature reaction is cross magnetizing when the synchronous generator supplies a unity power factor load.

When the generator supplies the leading power factor load the armature reaction is magnetizing. the armature reaction is demagnetizing when the generator supplies the lagging power factor load.

Question 4

What effect will the armature reaction produce for pure capacitive and RL load?

Accepted Answer

When a pure capacitive load or zero power factor leading load is connected across the terminals of the alternator, the current in armature winding will lead the induced e.m.f. by 90°. So the armature flux will be in phase with the main field flux, resulting in strengthening of the field flux causing the magnetizing effect. But for any intermediate power factor, the effect of armature reaction will be partly distorting and partly demagnetizing.

Question 5

How do you reduce the armature reaction in an alternator?

Accepted Answer

The armature reaction can be reduced by increasing the reluctance of the path of the magnetizing field between the armature teeth and pole tip. The armature reaction effect can also be mitigated by adding the compensating winding in series with the armature winding.

Author: Abragam Siyon Sing

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