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Stability of a synchronous machine
Decreases with increase in its excitation
Remains unaffected with an increase in excitation
Increases with increase in its excitation
All of these
Increases with increase in its excitation
The correct answer is C. The stability of a synchronous machine increases with an increase in its excitation, allowing for better control over the machine and enhancing its ability to withstand disturbances.
The correct answer is C. The stability of a synchronous machine increases with an increase in its excitation, allowing for better control over the machine and enhancing its ability to withstand disturbances.
E=V+IтЛЕZ тАФ where E is the electromotive force, V is the terminal voltage, I is the current, and Z is the impedance.
P=ZV2тАЛ тАФ representing power in terms of voltage and impedance.
This phenomenon occurs because higher excitation enhances the machine's ability to maintain synchronism and resist oscillations in power output. The increased excitation raises the internal generated voltage, which improves voltage regulation and stabilizes the operating point of the machine under varying load conditions.
Synchronous machines operate at a constant speed determined by the supply frequency.
Increased excitation improves the voltage stability and reactive power support of the machine.
Enhances system stability
Improves voltage regulation
Requires careful control of excitation
Over-excitation can lead to saturation
Hydroelectric power plants
Industrial power generation
Synchronous machines are critical for maintaining grid stability in large power systems.
Option A is incorrect because while excessive excitation can lead to issues, generally increasing excitation improves stability.
C is correct тАФ increased excitation improves the stability and operational performance of synchronous machines.
Understanding the relationship between excitation and machine stability can be crucial for real-world applications in electrical engineering.