Problem: A three-phase, 35kW, 400V, 50Hz induction motor operates at full-load with an efficiency of 87.5% and at a power factor of 0.8 lagging.
Using the power triangle approach:
a. Calculate the three-phase kVA ratting capacitors required to raise the full-load power to 0.94 lagging.
b. Calculate the capacitance per phase, if the capacitors are star-connected.
c. Calculate the capacitance per phase, if the capacitors are delta-connected.
d. State one advantage of having the capacitors connected in:
(i) Star
(ii) Delta