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  1. Y

    Can anybody help with this power question?

    "C" is typo as has been mentioned. Reactive current now at 0.8 PF is 77A. Reactive current at 0.9 will be 50A. 13 kVAR capacitor provides 27 A reactive. Connecting the cap in parallel will bring the reactive current to 50 A and the PF to 0.9.
  2. Y

    Can anybody help with this power question?

    Yes, it is vector sum. (For PF 0.9 the reactive power here should be about 21kVAR).
  3. Y

    Can anybody help with this power question?

    A reactive current is not necessarily the inductive - it may be capacitive as well. There is nothing said also whether the active power should stay the same. The reactive (supposedly inductive) power is now 12.5 kVar (50/80 X 100 = 62.5 - 50 = 12.5) slightly less than the capacitive power (from...
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