Hey guys,
Does anyone know if synchronous generators have V curves like synchronous motors do?
I came across V curves for synchronous motors while doing the Shorebrook PE Power practice exam, and the Wildi book also briefly touches on V curves for synchronous motors... but I don't remember it touching on V curves for synchronous generators...
For those of you that are unaware of V curves for synchronous motors, I attached an example illustration. The more leading p.f. a synch motor has, the more overexcited it is and hence the larger the excitation current Ix becomes. The more lagging p.f. a synch motor has, the less overexcited it is and hence the lower the excitation current Ix is.
So I'm guessing if synchronous generators have V curves, it would be horizontally mirrored to that of synch motor V curves:
Does anyone know if synchronous generators have V curves like synchronous motors do?
I came across V curves for synchronous motors while doing the Shorebrook PE Power practice exam, and the Wildi book also briefly touches on V curves for synchronous motors... but I don't remember it touching on V curves for synchronous generators...
For those of you that are unaware of V curves for synchronous motors, I attached an example illustration. The more leading p.f. a synch motor has, the more overexcited it is and hence the larger the excitation current Ix becomes. The more lagging p.f. a synch motor has, the less overexcited it is and hence the lower the excitation current Ix is.
So I'm guessing if synchronous generators have V curves, it would be horizontally mirrored to that of synch motor V curves:
- Since a lagging synchronous generator sends reactive power Q and is over-excited, the lagging arrow would point right.
- Since a leading synchronous generator absorbs reactive power Q and is under-excited, the leading arrow would point left.
- I'm guessing maybe also the locus of p.f.=1 points would veer towards the left instead of the right? Not sure about this one.
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