9. Consider a long 3 phase feeder with the following phase conductor properties:
ID: 2265643 • Letter: 9
Question
9. Consider a long 3 phase feeder with the following phase conductor properties: Reactance, XL = 0.050 AC resistance, R = 0.050 The feeder is supplying a balanced load. For a fixed current of 50 A, which of the following statements concerning the phase-to-neutral voltage drop at the receiving end of the feeder is most correct? a. The voltage drop is relatively independent of the load power factor. b. The voltage drop will be largest for a unity load power factor, c. The voltage drop will be largest for a zero load power factor. d. The voltage drop will be largest for a lagging load power factor of 0.707 than for either a unity load power factor or a zero load power factor.Explanation / Answer
Answer: d
The line reactance and resistance together is creating a power factor angle of 45 deg. Now with a lagging power factor of 0.707 an additional 45 deg power factor angle is added. Effectively there is a lagging angle of 90 deg which will create the maximum voltage drop.
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