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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
- a)inductor motor torque
- b)induction generator torque
- c)synchronous motor torque
- d)d.c. motor toque
Correct answer is option 'B'. Can you explain this answer?
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When the rotor speed, in a synchronous machine, becomes more than the ...
Synchronous machines are designed to operate at a fixed speed known as synchronous speed. However, during hunting, the rotor speed may deviate from the synchronous speed due to sudden variations in load or disturbances in the power system. When the rotor speed becomes more than the synchronous speed during hunting, damper bars develop induction generator torque.
Explanation:
Induction generator torque is the torque developed by the damper bars of the rotor of a synchronous machine when it operates above synchronous speed. The damper bars are short-circuited copper or aluminum bars that are placed in the slots of the rotor laminations. The purpose of the damper bars is to provide damping to the rotor oscillations during hunting.
When the rotor speed is more than the synchronous speed, the relative velocity between the magnetic field and the damper bars increases. This results in the development of eddy currents in the damper bars, which in turn produces a magnetic field that opposes the field of the stator. The interaction between the magnetic fields of the stator and the rotor produces a torque known as induction generator torque.
Induction generator torque is a transient torque that is produced during hunting and is not available during normal operation. The magnitude of the induction generator torque depends on the speed deviation, the damper winding resistance, and the geometry of the damper bars.
In conclusion, when the rotor speed becomes more than the synchronous speed during hunting, the damper bars develop induction generator torque. This torque helps to bring the rotor speed back to the synchronous speed and stabilize the machine.
Explanation:
Induction generator torque is the torque developed by the damper bars of the rotor of a synchronous machine when it operates above synchronous speed. The damper bars are short-circuited copper or aluminum bars that are placed in the slots of the rotor laminations. The purpose of the damper bars is to provide damping to the rotor oscillations during hunting.
When the rotor speed is more than the synchronous speed, the relative velocity between the magnetic field and the damper bars increases. This results in the development of eddy currents in the damper bars, which in turn produces a magnetic field that opposes the field of the stator. The interaction between the magnetic fields of the stator and the rotor produces a torque known as induction generator torque.
Induction generator torque is a transient torque that is produced during hunting and is not available during normal operation. The magnitude of the induction generator torque depends on the speed deviation, the damper winding resistance, and the geometry of the damper bars.
In conclusion, when the rotor speed becomes more than the synchronous speed during hunting, the damper bars develop induction generator torque. This torque helps to bring the rotor speed back to the synchronous speed and stabilize the machine.
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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars developa)inductor motor torqueb)induction generator torquec)synchronous motor torqued)d.c. motor toqueCorrect answer is option 'B'. Can you explain this answer?
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