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
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
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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- 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
- 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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