Question

THESE ARE QUESTION FROM THE TOPIC POWER FACTOR IMPROVEMENT FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS PLEASE DO THE QUESTIONS STEP BY STEP AND IN NEAT HAND WRITTING THE ANSWERS ARE GIVEN WITH THE QUESTIONS

1) 1. What should be the kVA rating of a capacitor which would raise the power factor of load of 100 kW from 0·5 lagging to 0·9 lagging

   ANS (125 KVA)

2)    A 3-phase, 50 Hz, 3300 V star connected induction motor develops 250 H.P. (186·5 kW), the power factor being 0·707 lagging and the efficiency 0·86. Three capacitors in delta are connected across the supply terminals and power factor raised to 0·9 lagging. Calculate :

(i) the kVAR rating of the capacitor bank    ( ANS 111.8 KVAR.)

(ii) the capacitance of each unit    (ANS 10.9uF )

Answer 1