Fault Level Calculation Of Eastern Part Of Nigeria 330Kv Grid Network Using NEPLAN


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Project and Seminar Material For Electrical Electronics Engineering EEE

Project and Seminar Material For Electrical Electronics Engineering EEE


Dedication


This project is dedicated to the Almighty God for his guidance; protection and inspiration in the course of making this project a success.


Acknowledgement


I recognize and appreciate those whose contributions both in cash and in kind, led to the success of this work and for this i will not fail to mention my parents (Mr. & Mrs. J.O. Okoro), sponsors, lecturers, brothers and sisters as well as my friends. I believe they will cherish their commitments so far as they fling through the pages of this work.
I also acknowledge my supervisor Engr. Ugorji for his advice, guidance and directives throughout this project.


Abstract


Fault in electrical power system can occur as a result of three phase short circuit, single line to ground, two phase to ground short circuit and line to line fault. These very faults, definitely, give rise to fault current.

Fault level calculation studies in power system, is required to know the fault currents in other to provide for necessary information for the selection of switch gears, circuit breakers, setting of relays and stability system operation.

NEPLAN (Network Planning) in power system analysis is software developed by BCP (Bursorello + Cott + Partner) Switzerland used for system modeling and analysis.


Table Of Content


  • Title page
  • Approval Page
  • Dedication
  • Acknowledgement
  • Abstract
  • Table of content

Chapter One

  • 1.0 Introduction
  • 1.1 Definition of fault
  • 1.2 Classification of faults
  • 1.3 Types of fault
  • 1.4 Reasons for carrying out fault analysis

Chapter Two

  • 2.0 Literature Review
  • 2.1 Modeling of Transmission line
  • 2.2 Short Transmission line
  • 2.3 Long Transmission line
  • 2.4 Medium Transmission line
  • 2.5 Representation of Transmission line
  • 2.6 Per unit system

Chapter Three

  • 3.0 Introduction to NEPLAN
  • 3.1 Eastern grid network
  • 3.2 330KV Transmission line parameters of Double & Single circuit
  • 3.3 Transmission line description (Eastern)
  • 3.4 Types of conductors used in Transmission line
  • 3.5 Types of tower design
  • 3.6 Components that make up the project
  • 3.7 Eastern Network simulation
  • 3.8 Result Analysis

Chapter Four

  • 4.0 Nigeria National Grid Network
  • 4.1 Generator data for Eastern grid
  • 4.2 Power system parameters
  • 4.3 Methods of solving unbalancing fault
  • 4.4 Sources of fault power
  • 4.5 Basic requirements protection system

Chapter Five

  • 5.0 Recommendation / Conclusion
  • References

Chapter One


1.0 Introduction

An electric power system is made up of generators, transformers, Transmission line and consumer equipment (loads). The system must be protected against the flow of heavy short-circuit currents which can cause permanent damage to the major equipments. And this is achieved by disconnecting the faulty section of the system by means of circuit breakers, switch gears, isolators and protective relays.

The need to know the maximum short-circuit current that can occur at the different points of the system in order that the breakers selected are adequate to withstand the current and operate successfully, to cut the faulty section, and also in order that the protective relays may be selected for correct operation. The design of machines, bus bars, isolators, circuit breakers etc is based on the consideration of normal and short-circuits currents.

It is also important to be able to calculate approximately at least the size of the protective reactors which must be inserted in the system to limit the short circuit current to a value which can be handled by the circuit breakers.

The short-circuit current is an A.C system are determined mainly by the reactance of the alternators, transformers, and lines up to fault in the case of phase-to-phase faults. When the fault is between phase and earth, the resistance of the path plays an important role in limiting the current.

The rupturing capacities of a circuit breakers are based on the symmetrical short-circuit current which is the most simple calculation among all types of short-circuits. However, for determination of setting of relays, it is absolutely necessary to know fault current due to unsymmetrical fault condition for which knowledge of symmetrical components etc is required.


1.1 Definition Of Fault

A fault in an electrical equipment/apparatus is defined as a defect in the electrical circuit to which current is diverted from the intended part.

Also fault is said to have occurred when a system fails to perform the required function at a given time. A fault occurs when two or more conductors that normally operate with a potential difference come in contact with each other or when a conductor that supposed to be continuous losses its continuity.

The nature of a fault simply implies any abnormal condition which causes a reduction to the basic insulation strength between phases conductors or between phases conductors and earth or any earthed screen surrounding the conductors. The reduction of insulation strength is not considered as a fault until it creates some effect on the system i.e, until it results either in excessive current or in between conductor and earth to a value below that of the lowest impedance normal to the circuit.

The possibility of occurrence of abnormal condition or failure is more on the power line.


1.2 Classification Of Faults

Balanced Or Symmetrical Faults

This is a kind of fault that gives rise to symmetrical fault current. In this type of fault, current in three phases are equal and have 120o displacement

Example, when all the three phase of conductors of a three phase line are brought together simultaneously into a short-circuit condition.

Unbalanced Or Unsymmetrical Fault

This is also another type of fault in a power system that gives rise to unsymmetrical fault current. In this case, the line current is unequal and the displacement is unequal.

IY ? IB ? IB
Examples of unbalanced fault.
1. A single line to ground
2. Line-to-line


1.3 Types Of Fault

  1. Three Phase Short-circuit Fault:This type of fault results due to breakdown of insulation between all the three phases or when there is a bridge involving all the three phases at a time. Its occurrence is 2 to 3 percent.
    Example:
  2. Single Phase to ground (L-G) short-circuit fault:This is caused as a result of breakdown of insulation between one of the phases and earth. Its occurrence is 70 percent.
    Example:
  3. Phase to ground (L-L-G) short-circuit fault:Due to breakdown of insulation between either of the two phases and earth. Its occurrence in power network is 10 percent.
  4. Phase to Phase (L-L) short-circuit fault:This is a type of short-circuit fault that occur due to the breakdown of insulation between either of the two phases, its occurrence is 15%.

1.4 Reasons For Carrying Out Fault Analysis In The Power System

One of the reasons for carrying out fault analysis in power system is to know the maximum short-circuit current that can occur at different points of a system in order to select a circuit breaker that can adequately withstand the current and operate successfully to cut-off fault section.

The design of machine bus-bars, isolators, circuit breaker etc. is based on the consideration of normal and short-circuit current.

Also to know the size of protective reactor while must be inserted in the system to limit the short-circuit current to a value which can be handled by the circuit breaker or protective devices.


I bet you, the complete material is fully loaded. This is just an excerpt. The Material is in MS-Word Format which you can easily edit and is comprehensive for a complete research work for this topic


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How to nail it on the head during your project defence


You are through with writing that project. Now what?

You have found yourself at that point where you have to defend what you have written. Of course you have to stand in front of your supervisor and other literary personalities to prove that you know what you wrote in your project paper. Unfortunately, the more you think about it, the more it looks like you are about to face a legion. It is not a war. But the emotion of dread welling up inside of you makes it look like one. So now you are asking yourself questions.

  • How am I going to start?
  • I hope I will do well enough to get an A.

You really want to nail it, but you need to come to terms with exactly how to get everything in perfect control. Especially your emotions of fear that seem to make a wreck of you every time you think about public speaking.
So here is the deal. I want to help you avoid that feeling that would ruin your precious moment if you dare to let it. And we are going to do it together.

I am going to highlight some very important tips to help you get in control for you to be comfortable enough to move from that feeling of DREAD to CONFIDENT; and making an awesome Impression for that great rating your supervisors should be giving to you so freely.

Consider these tips as you prepare for your defence. We will be taking them one after the other so here we go.


Watch Your Body Language And Keep It Confident:

Can you tell that a person is falling apart if they look confident? … If I can second guess you rightly, am sure you answered no to that question. Remind yourself that you need to come out that way. Now this might seem like a huge big deal when you are dealing with the foreboding. Maintaining a poise of confidence is very important. So find your most comfortable position, sitting or standing and draw up your body. You must exude confidence. It is something you need to do for yourself. People can only see what you allow your body language to show. So you must endeavour to put that out. Remember the story of David and Goliath? … At the end of your defence day, you want to be David.


Dress In Your Most Comfortable And Impressive:

Am sure this one is a no brainer. However I must highlight that you choose comfortable pieces. You don’t want to look so good and yet look like you were forced to wear something that does not belong to you. It’s great to ensure that as impressive as your clothes are on you, that they are also very comfortable.


Speak With Authority:

Going hand to hand with that aura of confidence is your most powerful asset:your words. If you look that confident, your words must not come out like whimpers. To be able to pull this off, you definitely need to speak as deliberately as possible in expressing yourself. Let them also hear what they see.


Use, Your Gestures:

I have often found this to come to my rescue in dealing with shyness and conveying my confidence. Usually it gives you an edge to also drive home your point. You must, however, ensure that you do not over use it. It doesn’t mean that your hands should be flying all over the place. That would be absolutely unnecessary. If you do this well, after a while you will realize that you are not as self-conscious as you used to be at the very start. For most situations, it would have completely disappeared altogether; leaving a really confident you talking.


Have A Good Opening And Closing Line:

Make sure you have perfected a good opening line. You should also be armed with a good closing line too. Try and rehearse it to a friend. If for the first time you presented it, your friend does not say “wow, that’s beautiful” or something like that; just know you need to keep refining it until you get the perfect line. Both opening and closing lines will go a long way in how impressed your panel gets to rate you high.


Make Sure You Know Your Work:

Certainly you should understand how important it is to know your own work from start to finish. Not having in-depth knowledge of your own work is tantamount to a suicide mission. Why should you kill yourself?
When all is said and done, this is what you came to defend in the first place. You should know your work from A to Z.


Prepare For The Questions:

Now this part is truly essential. You must be sure you do not floor all the good work you did on your presentation by not answering correctly. You must pay attention to the questions you are asked to be sure you will give the right answer. Many people get it wrong at this stage and spoil their good presentation. When you do not understand any question do endeavour to ask the person to expatiate what they mean before you answer.


These tips are by no means exhaustive, but applying these tips will give you some necessary advantage you need for a great outcome. Of course that outcome would mean that you eventually earn all your points on this project.


The structure of a good project work


Undergraduate projects in Nigeria is a prerequisite for graduation amongst Nigerian tertiary students who will which to obtain bachelors degree in their respective courses of study such as accounting, banking and finance, business administration and a host of others. Writing an undergraduate project in Nigeria for final year students entails a lot both financially and otherwise. Being able to develop any final year project depends on getting a researchable topic whether it is Accounting Undergraduate project topics, Banking and Finance research topics or banking and finance project topics and materials and it all requires diligent hard work of students who are willing to develop best undergraduate projects in Nigeria and graduate in flying colors.

A typical Undergraduate project in Nigerian tertiary institutions can be said to be divided into five or six chapters depending on the format of the school and course of study which are


1. Introduction

The introduction of an undergraduate project states the main research problem and research argument. What precisely the study is all about and why it is important. It looks at the originality of the research work and how it will fill the gap in other studies. Justification for a research undergraduate topic should not be lengthy before it has been explicitly stated.

Below are the contents in chapter one of an undergraduate research project which includes;

  • Background of the study,
  • Statement of the problem,
  • Objectives or aims of the study,
  • The research questions,
  • Research hypothesis,
  • Significance of the study,
  • Scope of the study,
  • Limitations of the study and
  • Operational definition of terms.

2. Literature review

Literature review of any undergraduate research work, be it business administration project topics or Economics project topics just to mention a few is very critical to securing a high grade in one’s project work. The literature review of a research process uncovers what other writers have written about the student’s topic. A student’s undergraduate research work should include a discussion or review of what is known about the subject and how that knowledge was acquired. The review could conclude with a brief summary of the literature and its implications. The contents of the literature review are the theoretical review, conceptual framework, empirical review and summary of literature review.

3. Research Methodology

This section includes a description of the research methods used in the undergraduate research work such as the sample size, data collection methods, measurement instruments, research data analysis procedures and the population from which the sample was selected.  This section also describes the method used in selecting the sample or samples, validation and reliability of the instruments used in the research work. There are different research statistical techniques used in undergraduate research work such as SPSS, e-views etc.


4. Results & Discussion

This section presents and discusses the data analysis results used in an undergraduate research work, the results of each analysis is being summarized, tabulated, and then discussed for each research question.  Then for each research hypothesis, the statistical test of significance selected and applied to the data is briefly described, followed by a statement indicating whether the hypothesis was supported or not supported.  In presenting the result analyses/summary in an undergraduate project tables and figures and or graph are used to add clarity to the presentation.


5. Summary, Conclusions And Recommendations

This section summarizes the findings of the study in an easy to understand manner.  It also explains the practical implications of those findings, and points to recommended directions for future research in that area.


References:

This is where every source cited in the undergraduate research work is being included. Every undergraduate research work must be properly referenced for its authenticity.


Choosing A Good Project / Research Topic


Students in Nigerian universities these days wish to choose a very simple project topic/material. There is no issue choosing a simple project topic; the only problem is your ability to choose a good project or research topic that your supervisor will easily approve for you.

Most project supervisors really want to see how good his or her project student understands his or her surrounding through the kind of topic he or she chooses for their project work.

There are some project topic that are not reject-able; for instance in Nigeria of today; what do you think is the major issue on ground now?

If a project student can choose or craft a topic on the effect of dollar increment on the economy of Nigeria. Such project topic will be very interesting to write on.

Now what are the qualities of a good project topic?

  1. The materials for the project topic must be easily assessable.
  2. The project topic itself must be meaningful.
  3. The variables must be able to give a clear aim of the project topic.

What do I mean by variable?

Well I am deriving my point from the area of project writing; the variables here are those main words in the project topic.

Like the above project topic; the effect of dollar increment on the economy of Nigeria. You can see the main variables that really define this project topic are:dollar, increment and economy.

Before you present your topic to your project supervisor, first of all understand your project topic, and then secondly try to do some research for your topic to see if at least you can get up to 60% of what you need to write the complete project.

I said that above because you might have a very nice topic that the materials are not available online and there are no books as regard the topic; in this case the project topic becomes difficult for you even though the topic is catchy.

What do I mean by your topic being assessable?

Well what I mean is very simple and easy to understand. Simply pick your project topic, type it on google and see if you will have at least a good background for the topic you are writing on.

If you can have a good background for your project topic and you can understand the problem associated with the project topic, then I believe the aim of the project is not far-fetched.

SAMPHINA ACADEMY

SAMPHINA ACADEMY

Samuel Obiora Blessed is the CEO and founder of Samphina Academy (samphina.com.ng) a.k.a Nigeria Students Media, the youngest engineering graduate of Federal Polytechnic Nekede in 2017 and the engine brain behind this great platform. He is the man behind the scene, filled with many potentials, a musician as well as a pro developer with the interest of Nigerian students at heart.

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