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# Rotating Machinery

1.  Junior Member Pro Subscriber
Join Date
Jun 2017
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Reputation ## Rotating Machinery

A delta-connected three-phase alternator is driving a wye-connected resistive load. The alternator output voltage is 480 V. The load resistors are 12 ohms each. What is the phase current in the alternator?
Correct Answer: 40 A

The correct answer is not correct.  Reply With Quote

2. Originally Posted by wayneups A delta-connected three-phase alternator is driving a wye-connected resistive load. The alternator output voltage is 480 V. The load resistors are 12 ohms each. What is the phase current in the alternator?
Correct Answer: 40 A

The correct answer is not correct.
Agree with your assessment. My math:

Find phase voltage of Wye connected load => 480V/ sqrt(3) = 277.128 V

Find phase current of load => I = E/R = 277.128V / 12 ohm = 23.094 A

Find phase current of source => current of phase = current of line in wye connection => line current = 23.094A => current of phase in Delta = current of line / sqrt(3) = 23.094A / sqrt(3) = 13.33A  Reply With Quote

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