With a load power factor of unity, the effect of armature reaction on the main field flux of an alternator is:
With a load power factor of unity, the effect of armature reaction on the main field flux of an alternator is:
Right Answer is:
Distortional
SOLUTION
The effect of armature (stator) flux on the flux produced by the rotor field poles is called armature reaction.
- The armature reaction flux is constant in magnitude and rotates at synchronous speed
- At unity power factor load, the armature reaction is cross-magnetizing (distortional).
- At lagging power factor load, the armature reaction is partly demagnetizing and partly cross-magnetizing.
- When the generator supplies a load at the leading power factor the armature reaction is partly magnetizing and partly cross-magnetizing