Question

Calculate the compensator rating required for sin(Φ)=.13.

(a) 0.45 P.U

(b) 0.12 P.U

(c) 0.13 P.U

(d) 0.82 P.U

I got this question during an interview.

The above asked question is from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct option is (c) 0.13 P.U

For explanation: The compensator rating can be calculated using the relation QP.U=√1-cos^2(∅)=sin(∅)=.13. This per unit value VAR compensator is required to improve the power factor of the system.