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Question

A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and p.f is raised to 0.9 lagging. The kVAR rating of capacitor connected in each phase is ____ kVAR.
  1. 0.66

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Solution

The correct option is A 0.66


Reactive power before compensation =5×103×tan(41.41)

=4.409 kVAR

Reactive power after compensation =5×103×tan(25.84)

=2.421 kVAR

Reactive power supplied by capacitor bank,

=1.988 kVAR

kVAR rating of capacitors connected in each phase =1.9883=0.662 kVAR

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