Principles and Applications of Electrical Engineering
6th Edition
ISBN: 9780073529592
Author: Giorgio Rizzoni Professor of Mechanical Engineering, James A. Kearns Dr.
Publisher: McGraw-Hill Education
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Chapter 7, Problem 7.70HP
To determine
The ratio between the power delivered to the same motor in wye and delta connections.
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In general, a three-phase induction motor isdesigned for wye connection operation. However, forshort-time operation, a delta connection can be used atthe nominal wye voltage. Find the ratio between thepower delivered to the same motor in the wye anddelta connections.
What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator
. Determine the capacitance value that, when placed in parallel with this load, would produce a unity power factor. Assume that the source is 230 V at 60 Hz. The Q shown is a positive Inductive reactive power, which would have to be “offset” by the same value of Reactive Capacitance Power.
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Principles and Applications of Electrical Engineering
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- Let a 100V sinusoidal source be connected to a series combination of a 3 resistor, an 8 inductor, and a 4 capacitor. (a) Draw the circuit diagram. (b) Compute the series impedance. (C) Determine the current I delivered by the source. Is the current lagging or leading the source voltage? What is the power factor of this circuit?arrow_forwardA single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)arrow_forwardA source supplies power to the following three loads connected in parallel: (1) a lighting load drawing 10kW. (2) an induction motor drawing 10kVA at 0.90 power factor lagging, and (3) a synchronous motor operating at 10hp,85 effIciency and 0.95 power factor leading (1hp=0.746kW). Determine the real, reactive, and apparent power delivered by the source. Also, draw the source power triangle.arrow_forward
- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsarrow_forwardA single-phase source has a terminal voltage V=1200volts and a currentI=1530, which leaves the positive terminal of the source. Determine the real and reactive power and state whether the source is delivering or absorbing each.arrow_forwardConsider a single-phase load with an applied voltage v(t)=150cos(t+10)volts and load current i(t)=5cos(t+50)A. (a) Determine the power triangle. (b) Find the power factor and specify whether it is lagging or leading. (c) Calculate the reactive power supplied by capacitors in parallel with the load that correct the power factor to 0.9 lagging.arrow_forward
- Is the power factor in Question 6 a leading or lagging power factor? Explain your answer.arrow_forwardThe real power delivered by a source to two impedances, Z1=4+j5 and Z2=10 connected in parallel, is 1000 W. Determine (a) the real power absorbed by each of the impedances and (b) the source current.arrow_forwardAn industrial load consisting of a bank of induction motors consumes 50 kW at a power factor of 0.8 lagging from a 220-V,60-Hz, single-phase source. By placing a bank of capacitors in parallel with the load, the resultant power factor is to be raised to 0.95 lagging. Find the net capacitance of the capacitor bank in F that is required.arrow_forward
- Two single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V. a.) Find the currents flowing from transformers to the load. b.) Find the active powers that transformers transfer to the load.arrow_forwardTwo single-phase transformers whose phase electrical equivalent circuits are given below are connected in parallel and ZL= 0.8+j0.6ohm is feeding a worth of load. Idle operating voltage of Transformer 1 is 220 V and Transformer 2 idle operating voltage is 240V.a.) Find the currents flowing from transformers to the load.b.) Find the active powers that transformers transfer to the load.arrow_forwardA single-phase motor draws 180 W at a power factor of 0.8 lagging when connected across a 240 Vrms, 60-Hz source. A capacitor is connected in parallel with the load to produce a unity power factor. Determine the required capacitance.  The required capacitance = ____ μF.arrow_forward
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