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An Improved Fault Location On Power System Transmission Lines Using Fuzzy Logic Approach
CHAPTER ONE -- [Total Page(s) 3]
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When
developing a fuzzy logic control system, there are eight tasks we need
typically to perform in an iterative development cycle (Song et al,
1997).
· Define the problem
· Define the linguistic variables
· Define control surface (fuzzy sets)
· Define the behavior of the control surface (Fuzzy rules)
· Define reasoning mechanism (Fuzzy inference)
· Build the system
· Test the system
· Tune and validate the system.
1.6. STATEMENT OF PROBLEM
Uncertainty
imprecision, and ambiguity of power system conditions pose serious
challenges of complex mathematical modeling when we apply conventional
relay based protection techniques. These challenges are compounded by
the fact that the input parameters needed for the design of protective
systems are not always clear and distinct.
1.7. OBJECTIVE OF THE STUDY
This thesis is aimed at:
vImproving
power efficiency by providing alternative and improved solutions to the
challenges in the convetional maintenance scheme for high tension
transmission lines and even distribution lines.
vRemoving accident risks that are always encountered by maintenance crew when location faults.
1.8. THE SCOPE OF THE STUDY
This
thesis covers the existing conventional relay based fault location
schemes and the application of artificial intelligence (Fuzzy logic)
concept to provide improved solutions.
1.9. LIMITATIONS OF STUDY
This
thesis does not seek to design a completely new fault location scheme.
It uses operational and experimental results to improve on the existing
fault location scheme in transmission lines, subject to availability of
software that is compatible with fuzzy logic techniques.
1.10. ORGANIZATION OF THESIS
This
thesis is organized in six chapters. A general introduction and
background information about power system protection and review of
artificial intelligence techniques in power system protection is
presented in chapter One. In chapter two, a detailed review of related
literatures is presented. This includes power system faults, protection
zones, elements of protective system, distance relaying concepts and
operations, an typical applications of fuzzy logic to line fault
location. Chapter three deals with the design methodology (hardware and
software strategy), sources of data and flow diagram of design
implementation. The design presentation and simulation, using
appropriate software techniques, along with the basis for the design is
in chapter four. The results and discussion are presented in chapter
five. While the conclusion derivable from the thesis, some fuzzy logic
objections and suggested recommendations are presented in chapter six.
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ABSRACT - [ Total Page(s): 1 ]The problem of Electricity are enormous and can never be treated
completely until the fault department (maintenance) are improved upon
for urgent and rapid response to line faults.The present protection
scheme only isolates the lines in the event of faults, define the fault,
but leaves no proper information about the location of the fault.Faults
must occur on both the transmission and distribution lines but, the
problem is how fast can the fault be cleared when the maintenance team
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