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Network TheoryThree-Phase Circuits

A balanced three-phase load takes 6 kW at a power factor of 0.6 lagging. Its reactive power is?

  • A3.6 kVAR
  • B4.8 kVAR
  • C6 kVAR
  • D8 kVAR
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Correct Answer: D. 8 kVAR
Explanation: For cos(phi)=0.6, sin(phi)=0.8 and tan(phi)=4/3. Hence Q=P tan(phi)=6×4/3=8 kVAR.
Reference: Standard network theory: three-phase reactive power
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