-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
