# -219075-85725 Department

-219075-85725

Department: Electrical

Faculty:Engineering

Subject:Design Projects 3 (DES300S)

NETWORK PROJECT

TITTLE: MR

SURNAME AND INITIALS: MAPHALLA M.J

STUDENT NUMBER: 216041317

CELL NUMBER: 079 371 9369

DUE DATE: 08 AUGUST 2018

Contents

TOC o "1-3" h z u HYPERLINK l "_Toc491374625" ABSTRACT PAGEREF _Toc491374625 h 3

HYPERLINK l "_Toc491374626" INTRODUCTION PAGEREF _Toc491374626 h 3

HYPERLINK l "_Toc491374627" THE PROBLEM PAGEREF _Toc491374627 h 3

HYPERLINK l "_Toc491374628" POSSIBLE SOLUTION PAGEREF _Toc491374628 h 3

HYPERLINK l "_Toc491374629" PREFERRED SOLUTION PAGEREF _Toc491374629 h 3

HYPERLINK l "_Toc491374630" THEORY PAGEREF _Toc491374630 h 4

HYPERLINK l "_Toc491374631" CASE STUDY PAGEREF _Toc491374631 h 4

HYPERLINK l "_Toc491374632" SPECIFICATIONS PAGEREF _Toc491374632 h 4

HYPERLINK l "_Toc491374633" Performance Specification PAGEREF _Toc491374633 h 4

HYPERLINK l "_Toc491374634" Inputs PAGEREF _Toc491374634 h 4

HYPERLINK l "_Toc491374635" Outputs: PAGEREF _Toc491374635 h 4

HYPERLINK l "_Toc491374636" Technical Specifications PAGEREF _Toc491374636 h 5

HYPERLINK l "_Toc491374637" Cable PAGEREF _Toc491374637 h 5

HYPERLINK l "_Toc491374638" LITERATURE REVIEW PAGEREF _Toc491374638 h 6

HYPERLINK l "_Toc491374639" Circuit breaker PAGEREF _Toc491374639 h 6

HYPERLINK l "_Toc491374640" PRELIMINARY BUDGET PAGEREF _Toc491374640 h 6

HYPERLINK l "_Toc491374641" CONSTRAINTS PAGEREF _Toc491374641 h 7

HYPERLINK l "_Toc491374642" TIME FRAME PAGEREF _Toc491374642 h 7

ABSTRACTCPUT S4 Electrical Engineering(Power) students have been given tasks to go to the electrical industries to ask for a circuit/network diagram in order to do calculations based on the electrical components found in the network diagram. The aim of this report is to do the fault calculations and relay setting.

INTRODUCTIONThe Cape Peninsula University of Technology offers electrical engineering students an education that is made up of two major parts which are the theoretical as well as the practical component. An engineer must be able to translate the formulae, numbers, and other engineering abstractions into an understandable written form as well as be able to implement these practically. This project prepares a student to learn basic electrical protection components and build the knowledge on what the electrical industries do. It also requires a student to do the fault calculations and relay settings base on the network diagram which is found in the electrical industry. For this project, the City of Cape Town network will be used to do the above mentioned requirements.

THE PROBLEMIn the network diagram there was an improvement needed to be done, like extensions of the underground cables and other equipment and components needed to be considered when improving the network. The network was forced to be change and add the new components that have been extended.

POSSIBLE SOLUTIONIs to do the fault calculations

Relay settings

Replace the transmission line if damaged

Tighten the loose connection

PREFERRED SOLUTIONFault calculations

Relay settings

THEORYTo determine the calculations for resistances, reactance on the network, I will be using S3 book such as Electrical Distribution on chapter 6 (STEADY- STATE OPERATION OF THE OVERHEAD LINES) and for fault level calculations, I will use Electrical Protection S4 book on chapter 4 (PER UNIT) and chapter 5 (SYMMETRICAL FAULT CALCULATIONS).

Electrical Distribution

Chapter 6: STEADY- STATE OPERATION OF THE OVERHEAD LINES

Electrical Protection (Power system Protection)

Chapter 4: PER UNIT

Chapter 5: SYMMETRICAL FAULT CALCULATIONS

Principles of power systems by V.K Mehta, Rohit Mehta

Chapter 17: SYMMETRICAL FAULT CALCULATIONS

CASE STUDYFor this project I will produce hand calculations based on the network diagram/ drawing which will determine the fault levels calculations at each bus bar and by determining these fault I will need the values of the resistance, reactance, per unit values along the transmission lines, transformers and generating station. I will do these calculations by using the above resources. Fault calculations will be done using the above mentioned data values, verification of protection settings will also be done and will be chosen depending fault level calculations.

SPECIFICATIONSPerformance SpecificationInputsGenerator ratings (KVA, MVA and actual per unit value)

Transformer ratings(KVA, MVA and actual per unit value)

Line impedance (Resistance, reactance and the angle, distance/ length of the line)

Base voltages and MVA base for the whole system

Outputs:Relay settings

Fault calculations

Plug settings

Technical SpecificationsCableVULTEX Type A – Single Core

Armoured or unarmoured

Copper or aluminium conductors

-6388102133601kV- 33kV

-5905503747135

-5238751931670Figure SEQ Figure * ARABIC 1: Cable specificationFigure SEQ Figure * ARABIC 1: Cable specification

www.aberdare.co.za

LITERATURE REVIEWIn this section I will be discussing one protection device from the network diagram provided and find more information about it like:

Performance specifications

Technical specifications

South African Manufacturer

Price in rands

PRELIMINARY BUDGETItems Quantity Cost

Labour 120hrs at R150/hr R 18 000

Stationery R 100

Computer software R 300

Traveling fees R 150

Airtime R 100

TOTAL COST R 18 550

CONSTRAINTSThe budget is limited so the network design will be limited to five buses.

TIME FRAME

Duration Deadlines

Proposal 1 week August 2018

Project plan 2 weeks October 2018