Question
Download Solution PDFIf the alternator is over-excited and it delivers reactive power to the infinite bus, then under this condition:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExcitation of Synchronous Generator (Alternator):
Leading power factor: If field excitation is such that Eb < V the generator is said to be under excited and it has a leading power factor. So that it absorved reactive power.
Lagging power factor: If field excitation is such that Eb > V the generator is said to be over-excited and it draw lagging current. So that it delivered reactive power.
Unity power factor: If field excitation is such that Eb = V the generator is said to be normally excited.
V -curve for synchronous generator is shown below
Mistake Points
For Synchronous Motor:
Over-excited Synchronous Motor works at the leading power factor
The normal excited Synchronous Motor works at the lagging power factor
The Under excited Synchronous Motor works at lagging power factor
Last updated on May 9, 2025
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