검색 상세

ASSESSING THE RELIABILITY IMPACT OF ADDING PROTECTION DEVICES ALONG DISTRIBUTION NETWORK OF TANZANIA ELECTRIC SUPPLY COMPANY LIMITED : A CASE STUDY OF MTIBWA FEEDER

초록/요약

For utilities that use wooden poles for overhead Aluminum Conductor Steel Reinforced (ACSR) lines for distribution networks, faults are inevitable regardless of the maintenance efforts to keep the lines intact. This work intends to assess the impact of adding protection devices in distribution feeder of TANESCO distribution network by application of automatic fault locating, isolation and service restoration device(s) that will help improve the reliability indices of the distribution system. The proposed fault handling technique will involve addition of protection device(s) whose main function will be to identify and isolate faults that are occurring in downstream section(s) from the point of its installation. This is achieved since those protection devices will be continuously monitoring the voltage presence and current flow in the medium voltage line where by any increase in current along with absence of voltage is signaled and counted or isolated depending on its the nature. The aim is to assess the technical economic impact of addition of protection devices along important and key places, sections and spur lines ETAP will be used to evaluate the reliability of the current Mtibwa 33kV feeder design and then together with the proposed addition protection devices for automation which will be used to compared and so assess the impact of having automatic distribution feeder against an existing design of distribution network of TANESCO. Presently, distribution network feeders fault location, isolation and service restoration for the and above 250km long distribution lines is a difficult and time consuming task as it involves risky and countless trials of isolation and service restoration to locate fault circuit which deteriorates reliability of the distribution and reduces circuit breaker life span and the whole process is costly in general.

more

목차

CHAPTER ONE: 1.0 INTRODUCTION 1
1.1 Problem Formulation 1
1.2 Motivation of study 2
1.3 Research Problem 3
1.4 The Aim and Objective of the Study 3
1.5 Research Objective and Scope 4
1.6 Research Process and Methodology 4
CHAPTER TWO: 2.0 LITERATURE REVIEW 6
2.1 Introduction 6
2.2 An Overview of TANESCO Distribution network 6
2.2.1 TANESCO Distribution network statistics 8
2.3 TANESCO Distribution lines maintenance and repair 9
2.3.1 Maintenance and repair 10
2.4 TANESCO Distribution network feeder Protection, protection coordination and fault location procedures and techniques 12
2.4.1 TANESCO distribution network feeder protection system 12
2.4.2 Protection coordination, fault tracing procedures and techniques 15
2.5 Additional protection devices 17
2.5.1 How addition of protection devices can positively impact utility 17
2.6 Relation between adding protection devices and Reliability Indices 18
2.6.1 SAIDI 18
2.6.2 SAIFI 19
2.7 Review of Methodology 19
CHAPTER THREE: 3.0 METHODOLOGY 21
3.1 33kV Feeder Reliability Assessment Analysis 22
3.2.1 Load Point Indices 22
3.2.2 System Reliability indices 23
3.2.3 System Reliability by ETAP 25
3.2 Design reliability assessment 28
3.2.1 Reliability importance 28
3.2.2 Protection devices details 32
3.3 Assumptions and limitations 34
CHAPTER FOUR: 4.0 RESULTS AND INTERPRETATION 35
4.1 The inputs and results 35
4.2 Selection of Protection device(s) 36
4.2.1 Using a Recloser and Recloser as a Sectionalizer 36
4.2.2 Benefits of using a Recloser as a Sectionalizer 37
4.3 Reliability assessment of circuit's configurations 39
4.4 Results interpretation 49
4.5 Economic analysis of reliability improvement impact 52
4.5.1 System Average Interruption Cost (SAIC) 52
4.5.2 Project payback period analysis 55
CHAPTER FIVE: 5.0 CONCLUSION AND FUTURE WORK 57
5.1 Summary 57
5.2 Conclusion 58
5.3 Future Work 58
BIBLIOGRAPHY 59

more
반출 Meta View 목록