Q5 (b)   A synchronous generator and a motor are both rated at 30MVA, 2kV and both have transient reactance of 20%. The transmission line connecting them has a reactance of 10% on the base of the machine ratings. The motor is drawing 20MW at 0.8 power factor lagging and a terminal voltage of 12.8kV when a symmetrical three-phase fault occurs at the motor terminals. Using the internal voltage of the machines, carry out design calculations to determine:   1.   The prefault generator terminal voltage. 2.   The sub-transient current in the generator and the motor. 3.   The total fault current

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  • Q5 (b)
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  • A synchronous generator and a motor are both rated at 30MVA, 2kV and both have transient reactance of 20%. The transmission line connecting them has a reactance of 10% on the base of the machine ratings. The motor is drawing 20MW at 0.8 power factor lagging and a terminal voltage of 12.8kV when a symmetrical three-phase fault occurs at the motor terminals. Using the internal voltage of the machines, carry out design calculations to determine:

 

  • 1.   The prefault generator terminal voltage.
  • 2.   The sub-transient current in the generator and the motor.
  • 3.   The total fault current

 

  • 4.   Comment on the relative sizes of the sub-transient currents in the generator and in the motor which were obtained in Q5 (b).
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