Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 2, Problem 2.15P
An autotransformer is used to connect a 12.6-kV distribution line to a 13.8-kV distribution line. It must be capable of handling 2000 kVA. There are three phases, connected Y—Y with their neutrals solidly grounded.
- What must the
- How much apparent power must the windings of each autotransformer handle?
- What is the power advantage of this autotransformer system?
- If one of the autotransformers were reconnected as an ordinary transformer, what would its ratings be?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
usıng j-k and D flipflop design a counter that counts 0,2,1 again as shown below ın the table
find the minterms of the followıng boolean expressıon desıgn F's cırcuit using one of the approciate decoders given below and a NOR gateF(A,B,C,D)=(A+'BC)(B 'C+'A 'D + CD)
64) answer just two from three the following terms:
A) Design ADC using the successive method if the Vmax=(3) volt, Vmin=(-2) volt, demonstrate the
designing system for vin-1.2 volt.
Successive Approximation ADC
Input Voltage-1.1 V
-4-3.5-3 -2.5 -2 -1.5 +1 -0.5
0 0.5 1 1.5 2 2.5 3
3.5
1
T
-8 -7 -6 -5
-3
+2 -1
0 1 2
3
4
5 6
7
X=1???
1st guess: -0.25 V
(too high)
X=11??
2nd guess: -2.25 V
(too low)
3rd guess: -1.25 V
(too low)
X=1110
X=111?
4th guess: -0.75 V
(too high)
Make successive guesses and
use a comparator to tell
whether your guess is too high
or too low.
Each guess determines one bit
of the answer and cuts the
number of remaining
possibilities in half.
Chapter 2 Solutions
Electric machinery fundamentals
Ch. 2 - Is the turns ratio of a transformer the same as...Ch. 2 - Why does the magnetization current impose an upper...Ch. 2 - What components compose the excitation current of...Ch. 2 - What is the leakage flux in a transformer? Why is...Ch. 2 - List and describe the types of losses that occur...Ch. 2 - Why does the power factor of a load affect the...Ch. 2 - Why does the short-circuit test essentially show...Ch. 2 - Why does the open-circuit test essentially show...Ch. 2 - How does the per-unit system of measurement...Ch. 2 - Why can autotransformers handle more power than...
Ch. 2 - What are transformer taps? Why are they used?Ch. 2 - What are the problems associated with the Y—Y...Ch. 2 - What is a TCUL transformer?Ch. 2 - How can three-phase transformation be accomplished...Ch. 2 - Prob. 2.15QCh. 2 - Can a 60-Hz transformer be operated on a 50-Hz...Ch. 2 - What happens to a transformer when it is first...Ch. 2 - What is a potential transform? How is it used?Ch. 2 - What is a current transformer? How is it used?Ch. 2 - A distribution transformer is rated at 18 kVA,...Ch. 2 - Why does one hear a hum when standing near a large...Ch. 2 - A 100-kVA, 8000/277-V distribution transformer has...Ch. 2 - A single-phase power system is shown in Figure...Ch. 2 - Consider a simple power system consisting of an...Ch. 2 - The secondary winding of a real transformer has a...Ch. 2 - When travelers from the USA and Canada visit...Ch. 2 - A 1000-VA, 230/115-V transformer has been tested...Ch. 2 - A 30-kVA, 8000/230-V distribution transformer has...Ch. 2 - A 150-MVA, 15/200-kV, single-phase power...Ch. 2 - A 5000-kVA, 230/13.8-kV, single-phase power...Ch. 2 - A three-phase transformer bank is to handle 500...Ch. 2 - A 100-MVA, 230/115-kV, Y three-phase power...Ch. 2 - Three 20-kVA, 24,000/277-V distribution...Ch. 2 - A 14,000/480-V, three-phase, Y-connected...Ch. 2 - A 13.8-kV, single-phase generator supplies power...Ch. 2 - An autotransformer is used to connect a 12.6-kV...Ch. 2 - Prove the following statement: If a transformer...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - A 10-kVA, 480/120-V conventional transformer is to...Ch. 2 - Two phases of a 14.4-kV, three-phase distribution...Ch. 2 - A 50-kVA, 20,000/480-V, 60-Hz, single-phase...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - Prove that the three-phase system of voltages on...Ch. 2 - A single-phase, 10-kVA, 480/120-V transformer is...Ch. 2 - Figure P2-4 shows a one-line diagram of a power...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Datacommunıcatıonin a commuinaction ASYNCHRONOUS TRANSMİTİON is used in this transmistion 7-bit chatacter will be transfered even parity will be used ,stop element is as 1,5 bits a)=select a chracter yourself and dısplay the signal transfered in this transmission , and calculate the overhead in this transmisionarrow_forward(i) Find the inverse z-transform of the system H(z) = for the following regions of convergence. Write in the final answer for each case in the allocated rectangular box below (a) |z| 3 (c) 1arrow_forwardQ3: Material A and Material B are collected in a tank as shown where the system consists of three Push-Button, three Level Sensors, two Inlet valve, one Outlet valve, Heater, Temperature Sensor, Agitator Motor, and Alarm Light. Material A and Material B are to be mixed and heated until it reaches 90°C temperature, and it will be drain using outlet valve also high-level Alarm Light will come ON when the tank is full and stay on even if the tank level drops until the operator press Reset Push-Button. Implement automation of this system in PLC using Ladder Diagram programming language (Note: The tank is fed with Material A before B and the temperature sensor can withstand 200°C and it gives voltage from 0 to 10 volts) (25 Marks) Valve A Agitator Motor Valve B Level B Heater E Level A Low Level Sta Start Push-Button Stop Push-Button 36. ویر نکند Temperature sensor Outlet Valve Reset Push-Button Alarm Lightarrow_forward.Explain how a gated J-K latch operates differently from an edge-triggered J-K flip-flop. . For the gated T Latch circuit, answer the following: a) Draw the gate-level diagram of a gated T latch using basic logic gates and SR latch b) Write the characteristic equation. c) Draw the state diagram.arrow_forwardA Digital Filter is described by the following. difference equation: Y(n)=0.5x(n) 0.5(n-2) - Find the transfer function ..arrow_forwardQ4) answer just two from three the following terms: A) Design ADC using the successive method if the Vmax=(3) volt, Vmin=(-2) volt, demonstrate the designing system for vin-1.2 volt.arrow_forward(a) For a voltage phasor V(jω) and a current phasor I(jω), give an expression for the complex power.(b)Give three examples of how real (average) power might be dissipated.(c)A time-domain voltage is defined by the expression v(t)= 5 cos(πt/3) V. When this is applied across an impedance Z = 4∠60° Ω, determine:(i)The instantaneous power.(ii)The average power.arrow_forwardConsider the LTI system with the input x(t) = e^28(t) and the impulse response h(t) = e−²tu(t). a) Determine the Laplace transform of x(t) and h(t). (10 marks) b) Using convolutional property, determine the Laplace transform and the ROC for the output response y(t).arrow_forward解出R1和R2arrow_forwardAccording to the book the answers are m= 30 and n = 5 and number of switch blocks is 220arrow_forwardfind reactive power demand , capacitor bank provides and overcompenstationarrow_forward(A) Consider a communication system where the number of successful transsions out of 10 trials follows a binomial distribution. The success probability for each triat is 0,95, Let X be the random variable representing the number of successful transmissions. -Sketch the cumulative distribution function (CDF) of the distribution. 2- Find Skewness coefficients and check if the distribution is symmetrical or skewed to the right or left. 3- Find kurtosis coefficients, Check if the distribution is mesokurtic, leptokurtic or platykurtic. 4- Find the probability of getting at most eigh. successful transmissions. 5- Find the probability P(20 with a mean 2-1 calculate the probability that the noise is greater than 3 units.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
Recommended textbooks for you
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...
Electrical Engineering
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:Cengage Learning
TRANSFORMERS - What They Are, How They Work, How Electricians Size Them; Author: Electrician U;https://www.youtube.com/watch?v=tXPy4OE7ApE;License: Standard Youtube License