Engineering Board Exam Reviewer · Three-Phase Systems in Power Applications · medium
A balanced three-phase load of 100 kW operates at 0.8 power factor lagging. How many kvar of capacitors are needed to raise the power factor to 0.95 lagging?
- 75 kvar
- 108 kvar
- 42.1 kvar
- 15 kvar
Answer
C. 42.1 kvar
Solution
Q1=P ( -10.8)=100(0.75)=75 kvar and Q2=P ( -10.95)=100(0.3287)=32.9 kvar. QC=Q1-Q2=42.1 kvar.
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