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Thames Valley University Faculty of Technology Engineering Module Study Guide Module Study Guide Power Systems Power Systems Semester 2 Contents SECTION ONE: Welcome to the Module...........................2 SECTION TWO: Learning Experience.............................3 SECTION THREE: Learning Resources............................4 SECTION FOUR: Teaching, Learning and Assessment..............6 Teaching Schedule...........................................6 SECTION FIVE: Assessment....................................11 Assessment Feedback + Timing for Formative and Summative...11 Referencing................................................11 Plagiarism.................................................11 Submission of work.........................................12 Extensions.................................................12 Evaluation of the Module...................................12 SECTION SIX: Assessment Criteria and Grading:..............13 SECTION SEVEN: Assignments.................................15 Assignment 1: Frequency Response...........................16 Assignment 2: Control system design........................18 Module Evaluation Questionnaire.............................20 Page 1 of 37
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Page 1: Power Systems MSG

Thames Valley University

Faculty of Technology

Engineering

Module Study GuideModule Study GuidePower SystemsPower Systems

Semester 2

Contents

SECTION ONE: Welcome to the Module.................................................................................2SECTION TWO: Learning Experience......................................................................................3SECTION THREE: Learning Resources....................................................................................4SECTION FOUR: Teaching, Learning and Assessment............................................................6

Teaching Schedule..................................................................................................................6

SECTION FIVE: Assessment...................................................................................................11

Assessment Feedback + Timing for Formative and Summative..........................................11

Referencing...........................................................................................................................11

Plagiarism.............................................................................................................................11

Submission of work..............................................................................................................12

Extensions.............................................................................................................................12

Evaluation of the Module.....................................................................................................12

SECTION SIX: Assessment Criteria and Grading:.................................................................13SECTION SEVEN: Assignments............................................................................................15

Assignment 1: Frequency Response..................................................................................16

Assignment 2: Control system design................................................................................18

Module Evaluation Questionnaire............................................................................................20

© TVU April 2008

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SECTION ONE: Welcome to the Module

Module Leader Name: Dr. Walid ZgallaiEmail: [email protected]: 0118 943 5637

Module SummaryThis module introduces the student to the fundamentals of power engineering. It introduces multi-phase systems, transformers, machine theory, the alternating current and direct current machines.

Basic Information about the Module

Module Code: TC50273R

Module Title: Power Systems

Module Level: 5

Learning Hours: 200

Semester Availability: 2

Length of the Module: 1 semester - 15 weeks

Core or Option: Core

Pre-requisite Module(s): None

Credits Awarded for the Module: 20

Named Pathways: BEng(hons) Power and Control

Professional Accreditation: IET

Timetable: 42 Hrs

SECTION TWO: Learning ExperienceThe aims of the module are to:

Consider the electrical power system and its constituent components, mainly three-phase systems, transformers, alternating current and direct current machines as generators and motors.

To equip students with knowledge of the design and analysis of power systems.

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Learning Outcomes

Upon completion of this module the student will be able to:1. Outline the fundamental concepts of the power systems.2. Demonstrate technical knowledge of the design and application of transformers. 3. Illustrate the principles of machine theory and its applications.4. Explain the underlying principles of alternating current machines.5. Analyse synchronous machine systems.6. Outline the basic operations of direct current machines.

Content of the Module

1. Multiphase Systems1.1 Generation1.2 Delta connection1.3 Star connection1.4 Voltage, current and power1.5 Active power and power factor

2. Transformers2.1 Introduction2.2 Phasor diagram2.3 Construction2.4 Connections2.5 Losses2.6 Regulation2.7 Equivalent circuit2.8 Cooling methods

3. Machine theory3.1 Electrical machines3.2 Analysis and performance3.3 Magnetic field energy3.4 Energy balance3.5 Rotary motion3.6 Reluctance motor

4. AC synchronous machine windings4.1 Arrangement4.2 Rotor construction4.3 Stator winding e.m.f.4.4 Three-phase currents and rotating magnetic flux4.5 Analysis and reversal of direction

5. Characteristics of AC synchronous machines5.1 Armature reaction5.2 Voltage regulation5.3 Synchronous impedance5.4 Parallel operation5.5 Principle of action5.6 Advantages and disadvantages

6. Direct current machines6.1 Arrangement6.2 Double layer drum windings6.3 Armature winding e.m.f.6.4 Armature reaction6.5 Commutation

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SECTION THREE: Learning Resources

Materials to be provided

A printed copy of the Module Study guide Handouts for each lecture Tutorial problems Powerpoint presentations on Blackboard Audio summary of all lectures Video summary of all lectures

Essential text:

Hughes, E.(2005) Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, ISBN 10013114397-2.

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Reference texts:Bosela, T. (1996) Introduction to Electrical Power System Technology (US Imports and PHIPES) ISBN 0131865374

Dugan R (2002) Electrical Power Systems Quality (McGraw Hill) ISBN 007138622X

Other Learning Resources

IEEE JournalsIET JournalsScience Direct onlineIEEE Transactions on Power Delivery, http://www.ieee.org. IEEE Transactions on Power Systems, http://www.ieee.org.

Structure of Learning Resources for Open Learning and E-Learning

TVU Online provides a gateway to TVU's online resources. You can use the site:

to find information and learning resources relevant to your course for news and details of the University's services to access your email and other online services

Blackboard™ is a key part of TVU Online. It is the University's online learning system, providing students with web access (from anywhere in the world) to course materials, and other resources made available by lecturers.

Blackboard enables students to communicate electronically with their tutors and fellow students. It allows students and staff to take part in online group discussions, and access selected course materials, such as module study guides. Students are able to read announcements related to their course or the university as a whole, and to access a range of information sources.

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You will automatically be attached in Blackboard to the TVU programmes / modules on which you are enrolled. Course notes, assignments and announcements will be made available via Blackboard and students will also be able to submit their assignments on Blackboard.

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SECTION FOUR: Teaching, Learning and Assessment

Learning Activities

Taught sessions Seminars Tutor led workshops Student led workshops Laboratory sessions Industrial visits Invited speakers

The scheduled sessions each week are normally 3 hour taught sessions or a seminar that may be followed immediately by a practical workshop. In some weeks practical sessions may be extended by additional laboratory time.

In addition to these activities the students are expected to undertake a substantial amount of private study to compliment classroom sessions and also undertake tutorial exercises as directed.

Group activities may be undertaken as required in the class sessions and one to one sessions will be arranged as appropriate in the workshop sessions.

Teaching Schedule

Week Topic

1Topic Introduction to multiphase Systems.

Key Concepts/issues

Generation, delta connection, star connection

Teaching/ Learning

Presentation. Discussion group.

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with others

Bibliography/Reading

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Session Preparation

Independent learning

Read set text prior to lesson

Problem solving

Lecture notes

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activitiesReference to tutor handout

2Topic Introduction to multiphase Systems.

Key Concepts/issues

Voltage, current, power, active power, power factor

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solving

Bibliography/Reading

Bosela T – Introduction to Electrical Power System Technology (US Imports and PHIPES,1996) ISBN 0131865374.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

3Topic Transformers

Key Concepts/issues

Phasor diagram, construction, connections

Teaching/ Learning

Presentation. Discussion group.

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with others

Bibliography/Reading

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent

Read set text prior to lesson

Problem solving

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learning activities

Reference to tutor handout

Lecture notes

4Topic Transformers

Key Concepts/issues

Losses, regulation, equivalent circuit, cooling methods

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingSoftware tools

Bibliography/Reading

Bosela T – Introduction to Electrical Power System Technology (US Imports and PHIPES,1996) ISBN 0131865374.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

5Topic Machine theory

Key Concepts/issues

Electrical machines, analysis and performance, magnetic field energy

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingHardware design and analysis

Bibliography/Reading

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Session Preparation

Read set text prior to lesson

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Independent learning activities

Reference to tutor handout

Problem solving

Lecture notes

6Topic Machine theory

Key Concepts/issues

Energy balance, rotary motion, reluctance motor

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingHardware design and analysis

Bibliography/Reading

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

7Topic AC synchronous machine windings

Key Concepts/issues

Arrangement, rotor construction, stator winding e.m.f., three-phase currents and rotating magnetic flux, analysis and reversal of direction

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingSoftware skillsHardware design and analysisHardware analysis

Bibliography/ Hughes, E., Electrical and Electronic Technology, Pearson- Prentice

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Reading Hall, 9th Edition, 2005, ISBN 10013114397-2.Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

8Topic AC synchronous machines

Key Concepts/issues

Armature reaction, voltage regulation, synchronous impedance

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingSoftware skills

Bibliography/Reading

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

9Topic Three phase systems

Key Concepts/issues

Phase voltage, load current, balanced star, 3-phase supply

Teaching/ Learning

Laboratory

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills

Working with othersProblem solvingHardware design and analysis

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ActivitiesBibliography/Reading

Bosela T – Introduction to Electrical Power System Technology (US Imports and PHIPES,1996) ISBN 0131865374.

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Design, analysis, and problem solving

Lecture notes

10Topic AC synchronous machines

Key Concepts/issues

Parallel operation, Principle of action, Advantages and disadvantages

Teaching/ Learning

Presentation. Discussion group. Tutorial

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingSoftware skills

Bibliography/Reading

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

11Topic Direct current machines

Key Concepts/issues

Arrangement, double layer drum windings, armature winding e.m.f., Armature reaction, commutation.

Teaching/ Learning

Presentation. Discussion group.

Relevance to Relevant to assignment 1

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AssignmentsLinks to LSDS/Key Skills Activities

Working with othersProblem solving

Bibliography/Reading

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

12Topic Transformers

Key Concepts/issues

Three phase transformers, voltage, phase relations, isolation, voltage reduction

Teaching/ Learning

Laboratory

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solvingHardware design and analysis

Bibliography/Reading

Bosela T – Introduction to Electrical Power System Technology (US Imports and PHIPES,1996) ISBN 0131865374.

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

13Topic Industrial visit

Key Power system operation

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Concepts/IssuesTeaching/ Learning

Visit

Relevance to AssignmentsLinks to LSDS/Key Skills Activities

Group activities, communication

Bibliography/ReadingSession Preparation

Independent learning activities

Reference to tutor handout

Read set text prior to lesson

Problem solving

Lecture notes

14Topic A. C. and D. C. machines

Key Concepts/issues

Multiphase systems, transformers, machine theory, a.c. machines, and d.c. machines

Teaching/ Learning

Discussion group, tutorial.

Relevance to Assignments

Relevant to assignment 1

Links to LSDS/Key Skills Activities

Working with othersProblem solving

Bibliography/Reading

Shepherd J., Morton A. H., and Spence L. F. (1977) Higher Electrical Engineering, 2nd edition, Longman Scientific and Technical.

Hughes, E., Electrical and Electronic Technology, Pearson- Prentice Hall, 9th Edition, 2005, ISBN 10013114397-2.

Session Preparation

Independent learning activities

Read set text prior to lesson

Problem solving

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Reference to tutor handout

Lecture notes

SECTION FIVE: Assessment

This module has the following assessments

Assessment 1 Three-phase systems and transformers

Type of assessment: Written Assignment/Practical Number: 1/3Length: 6 weeksTiming: issue week 7Weighting: 15%Assessor: Tutor

Assessment 2 AC and DC machines

Type of assessment: Written Assignment Number: 2/3Length: 6 weeksTiming: issue week 7Weighting: 15%Assessor: Tutor

Assessment 3: Control System Design

Type of assessment: Unseen exam paperNumber: 3/3Length: 3 hoursTiming: issue week 15Weighting: 70%Assessor: Tutor

Pass requirements

The regulations state that students must attempt each component of formal assessment. Students must achieve a minimum of 20% in each assessed element and an overall mark of at least 40% to pass this module.

Anonymous Marking

University regulations require that all exams are subject to anonymous marking, all assessments should be subject to second marking before being seen by the external examiner. The assignments of this module will be subject to anonymous marking where possible

Assessment Feedback + Timing for Formative and Summative

Formative group feedback will be provided within 2 weeks after the submission date for each assignment

Individual feedback will be provided on feedback sheets for each assignment in accordance with College policy.

Immediate, individual feedback will be provided during workshop sessions

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ReferencingIt is vital that you include references and a full bibliography. All work will need to provide references (for works cited in the text) AND a bibliography (all works consulted, whether cited or not). Please note that these are not always the same thing.

PlagiarismPlagiarism is a serious academic offence. Work with un-attributed sources may be open to a charge of plagiarism, which may result in disciplinary action being taken against you. The onus is on you to ensure that you have referenced all of your citations, whether direct (in the form of quotations), or in the use of other people’s ideas.

Submission of workAll work must be submitted with the proper documentation completed (please attach a cover sheet). You would be well advised to keep a copy of your work.

ExtensionsIf you are unable to submit work on time and have good reason, then you will need either a Mitigating Circumstances Form or an Extension Form. Please consult your Module/Personal/Pathway Tutor for clarification and guidance should these circumstances apply. You will need to attend to these regulations in good time, as retrospective extensions will only be granted in exceptional circumstances. Please note that difficulty in obtaining access to typing/word processing facilities or poor time management are not deemed to be sufficient grounds for requesting an extension.

Late work without mitigating circumstances will only be eligible for a PASS (40%) grade.

Evaluation of the Module

This module will be evaluated by a student completed end of module questionnaire and tutor lead discussion, both feeding into the annual subject board meeting.

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SECTION SIX: Assessment Criteria and Grading: Assignment 1 Laboratory/Practical Assessment

16-20 14-15 12-13 10-11 8-9 4-7 0 – 3Organisation, Presentation, coherence & Style: The degree to which the work conforms to standard Laboratory report writing format. And the quality of presentationAvailable marks: 20

Excellent standard of referencing and presentation achieved.

Very high standard of referencing consistently applied, some minor editing errors, excellent presentation.

High standard of referencing consistently applied, some minor editing errors, good presentation.

Good basic referencing consistently attempted, some editing required, sound presentation.

Some evidence of basic referencing, editing required, presentational flaws.

Little evidence of referencing, major editing of work required, poorly presented.

Essentially no evidence of referencing presentation bordering on unsatisfactory

16-20 14-15 12-13 10-11 8-9 4-7 0-3Content, clarity of expression, and Specification of experimental tests, i.e what you are going to do and why

Available marks: 20

Excellent definition and Excellent critical analysis of the problem to be solved

Very good definition and comprehensive critical analysis of the problem to be solved

Good definition and good critical analysis of the problem to be solved

Clear definition and some critical analysis of the problem to be solved

Definition with some understanding of the problem to be solved

Statement but with no understanding of the problem to be solved

No obvious statement

27-35 22-26 19-21 17-18 13-16 7-12 0-6

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Laboratory Practical Work.

Available marks: 35

Excellent standard of laboratory practice displayed with many novel approaches to problems

Very good standard of laboratory practice displayed with some effective novel approaches

Good standard of laboratory practice displayed with some novel ideas

Clear standard displayed with all practical aspects completed

Basic standard of laboratory practice displayed with most of the practical tasks completed

Minimal laboratory standard with some aspects not correctly completed

Minimal laboratory standard with most aspects not correctly completed

16-20 14-15 12-13 10-11 8-9 4-7 0-3Evaluation of Data

Available marks: 25

Excellent independent and innovative conclusions achieved based on work undertaken.

Very high level of independent conclusions offered competently expressed based on work undertaken.

High level of independent conclusions offered based on work undertaken.

Good attempts made at conclusions, standard conclusions offered.

Basic conclusions offered.

Little evidence of any conclusions offered.

Conclusions essentially non existent

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SECTION SIX: Assessment Criteria and Grading

Written assignmentAssessed Criteria Max.

Marks80%+ 70%+ 60% + 50% + 40%+ 20%+ 0 - 20%

Presentation: The degree to which the work uses standard mathematical conventions, is clearly presented and requires little or no editing from the marker of the work.

10

High quality presentation with the consistent use of the correct conventions throughout the work.

Excellent use and application of the standard conventions and the work is presented in a very clear manner.

Very good application of standard conventions and a good clear presentation.

Good application of standard conventions and a clear presentation..

Basic evidence of the use of standard conventions and thought given to the presentation.

Minimal evidence of the use of standard conventions and little care taken in its setting out.

Almost a total lack of the use of the standard conventions and the work poorly set out

Method. Clearly shows that the problem has been understood and makes process of solving the problem clear by annotating the process that is being undertaken

45

Fully understands and clearly demonstrates a full understanding of the subject.

Excellent appreciation of the subject with a very sound approach to problem solving.

A very good approach to and execution of engineering problems.

A good appreciation for the subject which is converted into a sound approach to engineering problems.

Has grasped an understanding of the basics and is able to show some methodical approach to problem solving.

A little evidence that there is some small appreciation for understanding the subject

Does not demonstrate an understanding of the basics of the subject.

Accuracy. An incorrect answer is often produced to a problem by the careless execution of complex mathematical processes. Whereas marks will be attributed to 'method' as shown above, it is important to compute the correct answer to the problem.

30

A very high standard of accuracy is maintained with all the work.

Work virtually devoid of errors and is completed to the required accuracy.

Very few errors in the work with minimal effect on the solution of the Engineering problems.

Work contains few errors with little impact on the solution.

Work contains some errors but which do not have too much impact on the correct solutions to the problems.

Work contains many careless errors but shows some consistency at times.

Constantly makes errors in the work with little or no attention to detail.

Originality. Work which uses legitimate short-cuts or particularly efficient methods approaches to problem solving will gain extra marks. Originality does not include guesswork!

15

Originality in all areas which is beneficial to the overall process.

Originality in many areas which is beneficial to the overall process.

Originality in some areas which is beneficial to the overall process.

Good attempts made at non-standard approaches made with some success.

Some evidence of originality but on the whole basic methods prevail.

Little evidence of any different approaches to the work.

Shows no originality in the work

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SECTION SEVEN: Assignment

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Course No:

Hand in date: end of week 13Planned start date: end of week 7

If you are unable to meet this date you must follow the procedures outlined in the course handbook

BEng(hons) Power and Control

Module: Power Systems

Assignment 1: Three phase systems and transformers This assignment carries 15% of the marks available for this module.

Set by: Dr. W. Zgallai

Learning Outcomes covered by this assignment:

1. Outline the fundamental concepts of the power systems.2. Demonstrate technical knowledge of the design and application of transformers. 3. Illustrate the principles of machine theory and its applications.

Key skills:In attempting this assignment you will be able to demonstrate skills and produce evidence for at least part of:

N3.1: Plan an activity and get relevant information from relevant sources

N3.2: Use this information to carry out practical work including setting up experiments, testing components, observing circuits, getting measurements, evaluating results, and analysing.

N3.3: Interpret the results of your work, present your findings and justify your methods

ICT3.2 Enter and develop the information and derive new information

ICT3.3 Present combined information

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Experiment 1:

Aim

To derive the relationship between line and phase voltages and load currents in a balanced star connected three phase supply load.

Apparatus

Universal power supply 60-105. Switched three-phase resistance load 67-142. System frame 91-200. Standard frame of path leads 68-800. Either:

Virtual instrumentation multichannel I/O unit 68-500 (option 60-070-VIP) software pack 68-912-USBORConventional instrumentation Rectifier voltmeter and ammeter (Option C12) 68-117.

Method

With reference to your laboratory handouts:A. Consider the theoretical circuit diagram of Figure 3-13-5.

Set up the experiment as shown in Figure 3-13-6.Switch off all power.Switch on the PC and start the Virtual instrumentation software.Set the 250 V / 500 V range switches for V1 and V2 channels to 250 V.Measure and record the parameters associated with the resistive load for each leg as follows: line current, line voltage, and phase voltage.

B. Consider the theoretical circuit diagram of Figure 3-13-7.Set up the experiment as shown in Figure 3-13-8.Repeat the measurements as above.

[50 marks]

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Experiment 2:

Aim

To derive the voltage and phase relationships of commonly used three-phase transformers.

Apparatus

Universal power supply 60-105. Three phase transformer unit 61-107 System frame 91-200. Standard frame of path leads 68-800. Either:

Virtual instrumentation multichannel I/O unit 68-500 (option 60-070-VIP) software pack 68-912-USBORConventional instrumentation Rectifier voltmeter and ammeter (Option C12) 68-117.

Method

With reference to your laboratory handouts:Consider the theoretical circuit diagram of Figure 4-11-4.Set up the experiment as shown in Figure 4-11-6 (a) and (b) or (c).Switch off all power.Switch on the PC and start the Virtual instrumentation software.Set the 250 V / 500 V range switches for V1 and V2 channels to 250 V.

Measure and record the parameters for each of the following cases;

Set up the star star connected transformer as shown in Figure 4-11-8 (a) and (b) or (c).

Set up the star / delta connected transformer as shown in Figure 4-11-11 (a) and (b) or (c).

Set up the delta / delta connected transformer as shown in Figure 4-11-14 (a) and (b) or (c).

[50 marks]

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Course No:

Hand in date: end of week 13Planned start date: end of week 7

If you are unable to meet this date you must follow the procedures outlined in the course handbook

BEng(hons) Power and Control

Module: Power Systems

Assignment 2: Three phase systems and transformers This assignment carries 15% of the marks available for this module.

Set by: Dr. W. Zgallai

Learning Outcomes covered by this assignment:

1. Explain the underlying principles of alternating current machines.2. Analyse synchronous machine systems.3. Outline the basic operations of direct current machines.

Key skills:In attempting this assignment you will be able to demonstrate skills and produce evidence for at least part of:

N3.1: Plan an activity and get relevant information from relevant sources

N3.3: Interpret the results of your work, present your findings and justify your methods

ICT3.2 Enter and develop the information and derive new information

ICT3.3 Present combined information

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Q1) A 100-KW, 230-V, shunt generator has Ra = 0.05 ohms and Rf = 57.5 ohms. If the generator operates at rated voltage, calculate the induced voltage at a) full load, and b) half full-load. Neglect brush-contact drop.

[25 marks]

Q2)A 10 hp, 230-V shunt motor takes a full-load line current of 40A. The armature and field resistances are 0.25 ohms and 230 ohms, respectively. The total brush contact drop is 2 V and the core and friction losses are 380 W. Calculate the efficiency of the motor. Assume that stray-load loss is 1% of output.

[25 marks]

Q3)The results of no-load and blocked-rotor tests on 1 3-phase, wye connected induction motor are as follows:

No load test:Line to line voltage = 400 VInput power = 1770 WInput current = 18.5 AFriction and windage loss = 600 W

Blocked-rotor test:Line to line voltage = 45 VInput power = 2700 WInput current = 63 A

Determine the parameters of the approximate equivalent circuit. [25 marks]

Q4)The results of open-circuit and short-circuit tests on a 25-KVA, 440-V/220-V, 50 Hz transformers are as follows:

Open circuit test: Primary open circuited, with instrumentation on the low- voltage side.

Input voltage: 220 V, input current: 9.6 A, and input power = 710 W.

Short circuit test: Secondary short circuited, with instrumentation on the high- voltage side.

Input voltage: 42 V,Input current: 57 A, andInput power: 1030 W.

Obtain the parameters of the exact equivalent circuit, referred to the high-voltage side.Assume that R1 = a2 R2 and X1 = a2 X2.

[25 marks]

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Module Evaluation Questionnaire.

Your responses to this questionnaire will allow staff to quantify student views across a programme. Please help by filling in this form. Your response will remain anonymous. Summaries of responses will be made public via student representatives and within faculty offices.

5 4 3 2 1

Module Title:

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1. The content of the module was interesting

2. I found this module harder than other modules at this level

3. The teaching sessions were helpful in furthering my understanding of the subject 4. The Module Study Guide was useful

5. The assignments were clearly explained

6. The assessment criteria were clearly explained

7. Supporting materials needed to carry out the assignment(s) – e.g. library texts/software/equipment - were readily available

8. Feedback on coursework was timely

9. Feedback on coursework was helpful

10. The teaching environment was satisfactory

11. I contributed fully to my own learning during this module (attendance, involvement in discussions, time spent studying independently, etc.)

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Other comments

Please indicate what you liked best about the module

Please indicate what you liked least about the module

What would you like to see changed in the module?

Please use this space to make any other comments which you feel may help tutors to improve the delivery of the module. For example, if you have entered “disagree” for question seven or ten you could explain what was unsatisfactory about the supporting materials or the learning environment.

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