Question
Download Solution PDFWhich statements about the maximum power output of a cylindrical rotor synchronous generator are correct?
I. Maximum power output occurs when the load angle (δ) is 90°.
II. Maximum power is proportional to the square of the terminal voltage (V).
III. Over-excitation increases the generator’s maximum power capability.
IV. Maximum power is independent of the synchronous reactance (Xs).
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The power in a cylindrical rotor synchronous generator is given by:
\(P={EV\over X}sinδ\)
where, E = Induced EMF
V = Terminal voltage
X = Rotor reactance
δ = Load angle
Calculation
In the above expression, if δ = 90°, then sinδ = 1 and the power will be maximum.
\(P_{max}={EV\over X}\)
Hence, statement I is correct.
If the excitation of the generator is increased to an overexcited state, then the value of induced emf (E) will also increase, hence the power capability of the generator also increases.
Hence, statement III is correct.
Last updated on Jun 16, 2025
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