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Option 4 : Over Excited
Where
U.E = under excited
N.E = normally excited
O.E = overexcited
We can see from the V – curve that when the machine is overexcited it delivers reactive power Q.
In over-excitation, the synchronous motor is operating under a leading power factor and acts as a capacitor.
Hence we can say that the 3-phase synchronous motor works as a capacitor when it is over-excited.
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