Question

A balanced load of phase impedance 100 and power factor 0.8 is connected (a) in STAR, and (b) in DELTA, to a 400V, 3-phase supply. Calculate the power dissipation in each case.

Answer 1

Answer:

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Step-by-step explanation:

The input power to a 3-phase a.c. motor is measured as 5kW. If the voltage The input power to a 3-phase a.c. motor is measured as 5kW. If the voltage and current to the motor are 400V and 8.6A respectively, determine the power factor of the system?

Power P=5000W,

line voltage VL = 400 V,

line current, IL = 8.6A and

power, P =√3 VLIL cos φ

Hence

power factor = cos φ = P √3 VLIL

= 5000 √3 (400) (8.6)

Power P=5000W,

line voltage VL = 400 V,

line current, IL = 8.6A and

power, P =√3 VLIL cos φ

Hence

power factor = cos φ = P √3 VLIL

= 5000 √3 (400) (8.6)