Electrical Machines and Drives

P24727- Electrical Machines and Drives

Coursework-Second Attempt

Deadline For Submission: The submission deadline is as published on the Moodle drop

box associated with this submission

Submission Instructions A report containing the information required in the

assignment should be uploaded to Moodle

Instructions for completing the

assessment:

Once completed, the report should be saved as a pdf file and

uploaded to Moodle.

Examiners: Richard Walters and Branislav Vuksanovic

P24727: Electrical Machines and Drives

Lab Assignment

1. Introduction

In this project you are required to analyse and report back on an electrical machine and drive.

2. Requirements- Drives

 The drive system you are to analyse is a three phase H-bridge inverter driving a ‘star’

connected load.

 You should assume that the power supply voltage VS is 50V DC and that the power

devices are FET transistors. The transistors are ‘off’ when 𝑣𝐺𝑆 = 0𝑉 and is ‘on’ when

𝑣𝐺𝑆 > 5𝑉.

 The circuit diagram is shown in figure 1, VQn is the input to transistor Qn. The output

voltages of each phase are VR1, VR2 and VR3, and the currents through each resistor

are IR1, IR2 and IR3.

Figure 1: Three-Phase Inverter Circuit Diagram

 You should analyse two cases of the circuit during one complete cycle (360o). For each

change of input you should determine the values of VR1, VR2 and VR3, and the size

and direction of the currents IR1, IR2 and IR3. You can assume that the transistors

have zero on resistance and zero voltage drop when on. The switching of the transistors

for each case are shown in tables 1 and 2 respectively.

 Having completed the analysis, you should comment of the differences between the two

cases.

Q1

2SK2553S

Q2

2SK2553S

Q3

2SK2553S

Q4

2SK2553S

Q5

2SK2553S

Q6

2SK2553S

V1

50V

R1

10Ω

R2

10Ω

R3

10Ω

VQ1

VQ2

VQ3

VQ4

VQ5

VQ6

IR2

A

IR1

A

IR3

A

VR1

V

VR2

V

VR3

V

 Finally, comment on any particular issues relating to the switching of Q2, Q4 and Q6.

Angle Q1 Q2 Q3 Q4 Q5 Q6

0-120o On On

120-240o On On

240-360o On On

Table 1: Transistor Switching for Case 1

Angle Q1 Q2 Q3 Q4 Q5 Q6

0-60o On On On

60-120o On On On

120-180o On On On

180-240o On On On

240-300o On On On

300-360o On On On

Table 2: Transistor Switching for Case 1

3. Requirements- Machines

 You should produce a short report on the methods of protection of distribution

transformers in transformer substations.

 Your report should include a short introduction to the problem, listing and explaining

the possible types of faults and failures encountered with transformers.

 In the main section of the report you should explain and discuss the methods and

technology used to protect transformers and other equipment in transformer substations

from those failures. You can choose a particular fault type and discuss it in more details

or alternatively, you can briefly describe and list the main failure and fault types and

methods as well as equipment for the protection. You can use schematic or calculations

to illustrate the problems you are discussing.

 Your report should also have a short conclusion section where summary of discussion

and some conclusions about transformer protection methods and equipment will be

made.

 Report should not be longer than 4 pages and should be written in IEEE paper format.

4. Reporting and Assessment

A typed report of the project should be submitted

 The report should be divided into two halves, one for the drives exercise and one for

the machines exercise.

 Each half should contain a short introduction to the exercise- no more than 10 linessetting

out what is expected.

 Each part of the task should then be clearly presented in a separate section.

 A final summary section for each half should be presented where further comments and

analysis should be presented.

Marking

Drives Case 1 10 marks

Drives Case 2 20 marks

Drives Further comments 10 marks

Drives Presentation 10 Marks

Machines - Transformer Protection Report –

Introduction

15 Marks

Machines - Transformer Protection Report -

Protection Methods and Technology

20 Marks

Machines - Transformer Protection Report -

Conclusions

15 marks

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Computer Fundamentals

 

Solent University Coursework Assessment Brief

1 Assessment Details

1.1 Module designator: COM709 Summer 2020

Unit Title: Computer Fundamentals

Unit Code: COM709

Level: 7

Assessment Title: Personal Learning Record

Assessment Number: 1

Assessment Type: AE1

Wordcount restrictions: Between 20 to 200 lines per program

Consequence of failing word count There is no penalty

Individual/Group: Individual

Assessment Weighting: 100%

Issue Date: Week commencing 21/10/2019

Hand In Date: 13 September 2020 (4 PM local time)

Planned Feedback Date: 4 weeks

Mode of Submission: On-line

Number of copies to be submitted: 1

Anonymous Marking Anonymous marking

1.2 Assessment Task

ˆ You will create several computer programs in Python.

ˆ These programs must run on the examiners computer and create the

correct output according to each given exercises requirements speci-

cation.

1

ˆ If your program does not run you will FAIL that part.

ˆ Your programs must be commented to demonstrate knowledge of the

ideas for each exercise. You will be graded on the comments too.

ˆ You should keep all the information within one folder. The nal sub-

mission is a .zip archive of this folder. Within this, each exercise should

go in its own folder along with any necessary components to run the

program.

ˆ Your zip le must be named as your student number, for example;

Q12341234.zip

ˆ Inside it, folders must be EXACTLY named "exercise-01", "exercise-

02" etc

ˆ Inside each folder your main programs must be EXACTLY named

"program-01.py", "program-02" etc.

1.3 Evidencing your learning

A learning record is to be presented in code comments. These must conform

to Python "docstring" guidelines using triple quoted docstring blocks which

must return readable values when invoked with doctest.

Your program portfolio is to be built-up as a learning record throughout

the unit. Do not attempt to write all the programs in the last week - this

assignment has a signifant workload and must be spread over a suitable time-

frame. Your commented code should show evidence of evolving engagement

with, and understanding of, techniques covered by completing a number of

given tasks using appropriate computer software, algorithms, datastructures,

and online sources.

Code and its comments should make clear:

ˆ The purpose of the program. What it does.

ˆ Methods used. What algorithms, data structures and techniques make

it work

ˆ Initial conditions or pre-requisires. Any libraries, environments, paths

needed.

ˆ Input conditions. What data goes in. What is its format. Size limita-

tions?

2

ˆ Output expected. What is the data output format?

ˆ Error conditions. Are any exceptions or bad input handled?

PLEASE for ALL activities refer to the information given on SOL where

the exercises will be described in documents and/or video lectures.

1.4 Areas of work

As a heads-up, the program exercises will apply to roughly the following

areas, which do not necessarily match one-to-one with the lecture structure.

This is not a denitive list, but a guide only. To complete the tasks you will

be required to do additional reading and research:

1.4.1 Computer hardware

This task will test you on an area related to digital hardware, architecture,

number systems, code execution etc.

1.4.2 Algorithms and data structures

One task will require you to solve a problem that requires a good understand-

ing of data structures and algorithms like searcing, sorting or comparing

values.

1.4.3 Operating systems

Completing this task will require you to understand something about oper-

ating systems, scheduling, processes, lesystem directories and paths etc

1.4.4 Computer networking

This task will involve a knowledge of networking principles, IP addresses,

ports, fetching a URL, sockets or similar

1.5 Grading criteria

The following table sumarises the grading criteria. These are explained be-

low.

3

Criteria

(percent)

F3-F1 D3-D1 C3-C1 B3-B1 A4-A1

Correctness

(70)

wont run some er-

rors

pass

most

tests

pass all

tests

perfect

output

Comments

(30)

none few, con-

fusing

many

clear

complete doc

standard

1.5.1 Correctness 70%

Correctness measures whether your progam does what it should, that it

handles all input and produces accurate and meaningful output. If a program

cannot be made to run at all you will get an F grade. This may be because

you handed in a zip le that doesn't unpack, or unpacks into incorrect folder

structure, or you used the wrong version of Python, did not include a vital

le or other reason. If your program will not run in the automated program

test suite you automatically get F grade. If your program runs but gives

the wrong answers to input then you will get a D grade. Errors may be

failures to handle input ranges, numerically inaccurate output, or failure to

terinate. If your program passes most of the tests you will get a C grade.

Most peoples programs will pass some but not all tests. Tests may include

malformed strings, very large or small numbers, incomplete or missing input

parameters and so on. If your program passes some or moat of these attempts

to trick it you will get a B grade. If you program produces perfect output,

eciently, and cannot be hacked or made to break in any way you will be

awarded an A grade.

1.5.2 Comments (30%)

Comments are the documentation that explain your code, how it works, what

input it should be able to handle, what output the user can expect and so on.

In Python there is a very specic set of rules for creating good comments.

You need to use triple quoted "docstrings" which will be explained in a

lecture. Comments provide evidence that you know what your code does

and did not just copy it from a website. They help other programmers (and

professors marking your work) to understand what you were thinking when

you wrote some code. Therefore they help other programmers, and yourself

at a later date, to debug faulty code. In python, docstrings can be turned

into readable documentation by an automated process. This will be used in

the marking process. If your comments are missing you will get an F grade.

4

A few comments that don't really help, or seem confused will earn you a

D grade. If you include a fair amount of docstring comments, at least for

each function and the main program, you will get a C. Extensive comments

that describe the algorithm and input-output conditions will be worth a B.

Finally, if you include a complete, well written doctest suite that performs

you own automated testing of the program and writes its own report you

can have an A grade.

1.6 Academic context

1.6.1 Learning Outcomes

This assessment will enable students to demonstrate in full or in part the

learning outcomes identied in the unit descriptors.

Late Submissions

Students are reminded that:

If this assessment is submitted late i.e. within 5 working days of the sub-

mission deadline, the mark will be capped at 40% if a pass mark is achieved;

If this assessment is submitted later than 5 working days after the submission

deadline, the work will be regarded as a non-submission and will be awarded

a zero; If this assessment is being submitted as a referred piece of work (sec-

ond or third attempt) then it must be submitted by the deadline date; any

Refer assessment submitted late will be regarded as a non-submission and

will be awarded a zero.

http://portal.solent.ac.uk/documents/academic-services/academic-handbook/

section-2/2o-assessment-principles-and-regulations.pdf?t=1534423842941

1.6.2 Extenuating Circumstances

The University's Extenuating Circumstances procedure is in place if there are

genuine circumstances that may prevent a student submitting an assessment.

If students are not 't to study', they can either request an extension to

the submission deadline of 5 working days or they can request to submit

the assessment at the next opportunity (Defer). In both instances students

must submit an EC application with relevant evidence. If accepted by the

EC Panel there will be no academic penalty for late submission or non-

submission dependent on what is requested. Students are reminded that EC

covers only short term issues (20 working days) and that if they experience

longer term matters that impact on learning then they must contact the

Student Hub for advice.

A summary of guidance notes for students is given below:

5

http://portal.solent.ac.uk/documents/academic-services/academic-handbook/

section-2/2p-extenuating-circumstances.pdf?t=1534423896787

1.6.3 Academic Misconduct

Any submission must be students' own work and, where facts or ideas have

been used from other sources, these sources must be appropriately referenced.

The University's Academic Handbook includes the denitions of all practices

that will be deemed to constitute academic misconduct. Students should

check this link before submitting their work.

Procedures relating to student academic misconduct are given below:

http://portal.solent.ac.uk/support/official-documents/information-for-students/

complaints-conduct/student-academic-misconduct.aspx

1.6.4 Ethics Policy

The work being carried out by students must be in compliance with the

Ethics Policy. Where there is an ethical issue, as specied within the Ethics

Policy, then students will need an ethics release or an ethical approval prior

to the start of the project.

The Ethics Policy is contained within Section 2S of the Academic Hand-

book: http://portal.solent.ac.uk/documents/academic-services/academic-handbook/

section-2/2s-university-ethics-policy.pdf

1.6.5 Grade marking

The University uses a letter grade scale for the marking of assessments.

Unless students have been specically informed otherwise their marked as-

signment will be awarded a letter grade. More detailed information on grade

marking and the grade scale can be found on the portal and in the Student

Handbook.

http://portal.solent.ac.uk/documents/academic-services/academic-handbook/

section-2/2o-annex-2-assessment-regulations-grade-marking-scale.

pdf?t=1534424273208

Guidance for online submission through Solent Online Learning (SOL)

http://learn.solent.ac.uk/onlinesubmission

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Nuclear Technology

Academic Year 2019/20

P24603 – Nuclear Technology

Referral Examination or Coursework – Chernobyl Report

Submission Instructions

An electronic copy of the report is to be uploaded to Moodle via the unit website.

Instructions for completing the assessment:

The report must be the student’s own work, with any material taken from other sources properly referenced. Unreferenced material will not be marked.

The final submission must be written in English and must be able to be easily understood by the marker without significant deciphering. This rules out the use of automatic translation programmes to translate from another language, without proper scrutiny of the legibility of the final product.

Examiners:

Dr. S. Vincent and Mr. C. Smith

2019-20 Page 1 of 2

Aim

The aim of this second attempt exam - report is to produce a report which tests the student’s understanding of the Unit Learning Outcomes in the event of a failure in the first examination attempt.

Scope of the Report

The scope of the second attempt exam - report will cover the Unit Learning Outcomes as detailed below.

The second attempt exam - report will be a nominal 2000 words and will be based on the 1986 Chernobyl reactor accident.

The following aspects, aligned to the Unit Learning Outcomes, will be included in the report and each topic will be covered by a nominal 300 words (plus or minus 100 words):

- An appraisal of the design of the Chernobyl RBMK reactor, specifically the design and physics aspects that directly contributed to the reactor accident.

- Evaluate the scale of the radiation release and the radiological impact of the accident on workers, local populace and the environment.

- Review the national regulatory structure that enabled the reactor operations at the time of the accident and the local post-accident clean-up, highlighting and cultural and regulatory shortcomings that directly contributed to the reactor accident.

- Assess the effectiveness against the consequences of the local mitigation measures immediately following the accident.

- Critically assess the root causes of the accident and global impact on development of nuclear power.

Report Format

Description: The Coursework should be a nominal 2000 words. This word limit excludes the preliminary section, references and bibliography and appendices.

The following format is provided for guidance on suggested layout for the assessed Report:

A. Preliminary Section

1. Title Page

2. Abstract/Summary

3. Table of Contents

4. Acknowledgments (if any)

B. Main Body

1. Introduction, covering the link to the Unit Learning Outcomes as noted in the Report Scope above.

2. Discussion, including coverage of each Unit Learning Outcome with a nominal 300 words on each.

C. Conclusions and Recommendations

D. References and Bibliography

E. Annexes/Appendices (as required)

2019-20 Page 2 of 2

Fail

Low Pass

High Pass

Merit

Distinction

Mark

Knowledge

Has a largely given, possibly uneven and limited, factual and conceptual knowledge base. Limited or inappropriate research

Demonstrates a grasp of key concepts and familiarity with local/company literature in the wider context.

Has a comprehensive and detailed knowledge of a major discipline, supported by a critical contextual overview of the literature.

Has depth and systematic understanding of detailed knowledge in specialised or applied areas. Extensive use of relevant and current literature to view topic in perspective, analyse context and develop new explanations and theories.

And can work with theoretical or research-based knowledge at the forefront of their academic discipline

/35

Cognition

Little attempt at evaluation. Vague conclusions not based on researched material.

Demonstrates an ability to develop and support an argument in a predominately descriptive way with valid conclusions drawn from the research.

Analyses new data and situations without guidance, using a range of techniques appropriate to the subject.

Identifies and defines complex problems and can apply appropriate knowledge and skills to their solution.

Can critically evaluate research and scholarship.

Analyses incomplete, complex, or contradictory areas of knowledge.

Demonstrates initiative and originality in problem solving.

Shows ability to plan and implement proposals.

And acts autonomously and professionally in planning and implementing tasks.

Acts independently to make decisions in complex and unpredictable situations.

/35

Evidence (Reports, etc)

Evidence unorganized, incomplete and descriptive.

Evidence presented with logical and clear structure, well organised with good use of language; cited and presented according to convention.

Evidence fluent, detailed and coherent, soundly structured for the intended audience.

And well referenced with discrimination in content included

Evidence of professional quality, requiring only minor editing for publication.

/30 M/7 ……………...39 40………………49 50………………59 60……………….69 70…………………..

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