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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
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An induction motor absorbs an apparent power of 500 kVA at a power factor of 75%, calculate the active and reactive power absorbed by the motor, what purpose does the reactive power serve
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given voltage source of 120V, a 6ohm resistor and 8ohm capacitance are connected in parallel with an unknown impedance find impedance of the unknown load given real power is 5000W and reactive power is 2kvar.
What is the maximum transfer capability of the following system to supply a constant PQ load at 0.8 lag power factor. How much can this transfer capability be increased by installing capacitor banks
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