Determine the transformer tap ratios when the receiving end voltage is equal to the sending end voltage, the high voltage line operates at 220 kV and transmit 80 MW at 0.8 pf and the impedance of the line is (40+j140)ohm. Assume tstr=1.0 

(A) 0.8 (B) 0.9 (C) 0.7 (D) 0.6 
asked Apr 5, 2018 in Electrical Engineering by
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0.9 explanation given vs=vr convert in to phase voltage because impedence is always in phase line 220/root 3 then divided by reactive part that is 140 127.01/140=0.9 ans
answered Feb 6 by anonymous