Question
Download Solution PDFIn an alternator, if the load power factor changes from lagging to leading, the armature reaction effect shifts from:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFArmature Reaction in Alternator
In an alternator, armature reaction refers to the effect of the armature current on the magnetic field of the machine. This interaction results in a distortion of the magnetic field, leading to changes in the terminal voltage
Nature of armature reaction on alternator:
Power factor |
Nature |
Unity |
Cross-magnetizing |
Zero PF lagging |
Purely demagnetizing |
Zero PF leading |
Purely magnetizing |
0.8 lagging |
Partially cross-magnetizing and partially demagnetizing |
0.8 leading |
Partially cross-magnetizing and partially magnetizing |
From the above table, if the load power factor changes from lagging to leading, the armature reaction effect shifts from demagnetising to magnetising.
Last updated on Jun 7, 2025
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