Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 26, Problem 3PA
You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a current draw of 36 amperes at full load. The motor is connected to a 480-volt line. A three-phase wattmeter indicates a true power of 22 kW. Determine the power factor of the motor and the amount of capacitance needed to correct the power factor to
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Chapter 26 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 26 - How many degrees out of phase with each other are...Ch. 26 - What are the two main types of three-phase...Ch. 26 - A wye-connected load has a voltage of 480 V...Ch. 26 - A wye-connected load has a phase current of 25 A....Ch. 26 - A delta connection has a voltage of 560 V...Ch. 26 - A delta connection has 30 A of current flowing...Ch. 26 - A three-phase load has a phase voltage of 240 V...Ch. 26 - If the load in Question 7 is connected in a wye,...Ch. 26 - An alternator with a line voltage of 2400 V...Ch. 26 - What is the apparent power of the circuit in...
Ch. 26 - You are working in an industrial plant. A bank of...Ch. 26 - You are a journeyman electrician working in an...Ch. 26 - You are an electrician working in an industrial...Ch. 26 - Refer to the circuit shown in Figure 26-19 to...Ch. 26 - Refer to the circuit shown in Figure 26-20 to...Ch. 26 - Refer to the circuit shown in Figure 26-21 to...Ch. 26 - Refer to the circuit shown in Figure 26-22 to...
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- Q2. For the transformer shown in Fig. 1. A. Plot the winding connection for the transformer and justify your answer. (4M) B. If the transformer is adopted in 12 pulse diode rectifier, where two-series connected bridge rectifiers are used to supply a highly inductive load with 100 A. (i) Select a suitable turns ratio for the transformer (ii) Plot the line current of each winding ( secondary + primary) showing the current magnitude at each interval (iii) Use Fourier Page 1 of 3 analysis to obtain the Fourier series of all line currents then calculate the THD of the input current. (8=0° (16M) (Y) = 30° Fig. 1 P. I v Iarrow_forwardQ2. For the transformer shown in Fig.1, A. Find the phase shift between the primary and star-connected secondary. B. If the transformer is adopted in a 12-pulse diode rectifier, where a two-series connected bridge rectifier is connected in series and supplies a highly inductive load (i) Select a suitable turns ratio for the transformer (ii) Plot the line current of each winding (secondary + primary). (iii)Using Fourier analysis to obtain the Fourier series of all line currents, then calculate the THD of the input current. (iv) Draw the output voltage of the first and second rectifiers and give the relation of the total output voltage. N2 B C Fig. 1 N3 aarrow_forwardQ2.A. It is planned to use the transformer shown in Fig. 1, a 12-pulse rectifier. Each secondary is connected to three phase controlled bridge rectifier. The two rectifiers are connected in series to supply a highly inductive load. 1. Based on the phasor relationship between different windings. If suitable turns ratio is selected, is it possible to use this transformer to produce 12 pulse output voltage? Show the reason behind your answer. 2. Assuming this arrangement is possible to be used in 12-pulse rectifier, draw the output voltage of the 1st and 2nd rectifier and give the relation of the total output voltage. 3. Use the Fourier analysis to show the harmonics in all line currents of the transformer. A B in C Fig. 1 b la a 2 b.arrow_forward
- Q4. Give the reasons for the following 1. In AC machines drives, the frequency modulation index should be integer regardless the value of switching frequency. 2. Variable de link voltage is adopted in inverter operating in square wave operation mode 3. Practical values of switch utilization factor is different from theoretical values 4. In three-phase inverter with my is odd and multiple of 3, the even and tripplen harmonics are zero. 5. The PSC-PWM is attractive for the modular multilevel converterarrow_forwardQ6.B. Answer the following questions 1. Does the steady state load current in a half bridge inverter has an average value and what is the adverse effect of the average current component? 2. Can the LPF of single phase bridge inverter based on bipolar PWM be used with single phase bridge inverter based on unipolar PWM? Explainarrow_forwardQ3. Answer the following questions T 1. Compared to the bipolar voltage-switching scheme, the unipolar scheme is "effectively" doubling the switching frequency. Explain the statement's meaning and how this effect can be generated. 2. What are the properties of a good power switch, and what are its basic ratings? 3. What are the objectives of any PWM strategy for three-phase inverters? 4. Why is the current control PWM rectifier in the dq rotating reference frame preferred over the abc reference frame? 5. Define the switch utilization factor. Show how this factor can be calculated for different single-phase inverters for square wave operation mode at the maximum rated output.arrow_forward
- Q1.B. Explain output control by voltage cancellation in a single-phase inverter. What are the advantages over square wave operation?arrow_forwardQ3.B. What is the problem of three-phase HW rectifier and how can be resolved?arrow_forwardQ3-consider the unity feedback system shown below: a.Evaluate general formula of ess? b.Calculate the steady state error of the closed loop system due to R(s) unit step input, D(s)=0]? c.Calculate the steady-state response when D(s) and ramp and R(s)=0?arrow_forward
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