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What is the percentage increase of busbar voltage required to compensate for the reactance drop, when the feeder having a reactance of 5% carries a full load current at a p.f. 0.8 lagging?
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- 5%
- 1.2%
- 1.8%
- 3%
Correct Option: D
For a series impedance, approximate voltage in volts
= Vr cos φr + Vx sinφr
Here Vr and Vx are the percent resistance and reactance of the series element respectively.
Since the feeder has negligible resistance,
Vr = 0.
Percentage drop of voltage
= Vx sin φr
= 5 × 0.6
= 3%
