ENGINEERING APPLICATION The impedances of motors,
Chapter , Problem 18(choose chapter or problem)
ENGINEERING APPLICATION The impedances of motors, transformers, and electromagnets include both resistance and inductive reactance. Suppose that the phase of the current to a large industrial plant lags the phase of the applied voltage by when the plant is under full operation and using of power. The power is supplied to the plant from a substation from the plant; the line voltage at the plant is The resistance of the transmission line from the substation to the plant is The cost per kilowatt-hour to the company that owns the plant is $0.14, and the plant pays only for the actual energy used. (a) Estimate the resistance and inductive reactance of the plants total load. (b) Estimate the rms current in the power lines and the rms voltage at the substation. (c) How much power is lost in transmission? (d) Suppose that the phase at which the current lags the phase of the applied voltage is reduced to 18 by adding a RLC bank of capacitors in series with the load. How much money would be saved by the electric utility during one month of operation, assuming the plant operates at full capacity for each day? (e) What must be the capacitance of this bank of capacitors to achieve this change in phase angle?
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