Question
Download Solution PDFA synchronous motor, connected to an infinite bus, is working at a leading p.f. Its excitation e.m.f Ef and alternator terminal voltage Vt are related as
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe relationship between excitation EMF (Ef) and terminal voltage (Vf) is:
1.) For synchronous motor: In the case of synchronous motor, Ef lags Vt
|
Power Factor |
Magnitude |
|
Leading |
Ef > Vt |
|
Lagging |
Ef < Vt |
|
Unity |
Ef < Vt |
2.) For synchronous generator: In the case of synchronous generator, Ef leads Vt
|
Power Factor |
Magnitude |
|
Leading |
Ef < Vt |
|
Lagging |
Ef > Vt |
|
Unity |
Ef > Vt |
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