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# Rotating Machinery

1. Junior Member Pro Subscriber
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Jun 2017
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## 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?

The correct answer is not correct.

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?

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

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