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If the torque angle ‘delta’ increases indefinitely, the system indicates
1. Steady state stability
2. Permanent stability
3. Instability
4. None of the above 

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Correct Answer - Option 3 : Instability
  • Torque angle δ is the angle between Rotor flux and Stator fluxes, both are rotating at synchronous speed.
  • When the synchronous machine is connected to an infinite bus, its speed and terminal voltage are fixed and unalterable.
  • The control variables are only field current and the mechanical torque or load on the shaft.
  • There is a limit to the mechanical load that can be applied to a synchronous motor.
  • As the load is increased, the torque angle δ also increases until the condition arises when the rotor is pulled out of synchronism and the motor is stopped.
  • If the torque angle delta (δ) increases indefinitely, the system indicates instability in the machine whereas if it reaches some point and then decreases then starts oscillating about an equilibrium point then it shows that system is not losing stability.

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