Fault location for overhead distribution system

Pao Yue-kong Library Electronic Theses Database

Fault location for overhead distribution system

 

Author: Pang, Yiu-ming
Title: Fault location for overhead distribution system
Degree: M.Sc.
Year: 1999
Subject: Electric power systems
Electric fault location
Overhead electric lines
Electric power transmission
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electrical Engineering
Pages: v, 83 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1485420
URI: http://theses.lib.polyu.edu.hk/handle/200/836
Abstract: Due to the challenges facing many demand and importance of accurate fault location in distribution systems has increased, principally to minimize line outages through effecting repairs expeditiously. Contemporary methods to locate faults on overhead lines can be classified into two fundamental types: methods that require measurements from all ends of the line-unit fault locators; and methods that require measurement from only one end of the line-single-ended, or non-unit, fault locators. Unit fault locators do not require any information on the nature of the power system outside of the two points of measurement, they are an attractive option for power utilities owing to their ease of application. Single-ended fault locators are often more attractive from an operational point of view since there is no requirement for communications channels or recording equipment at both line terminals, and hence the overall cost of the locating equipment is smaller than for two-ended locators. Many algorithms for single-ended fault assumption regarding the nature of the source at the remote end of the line. This assumption is necessary to correctly account for the flow of fault current from the remote source to resistive faults This report presents a new technique in single-ended fault location for overhead distribution systems and is based on the concept of superimposed components of voltages and currents rather than total quantities. It is clearly shown that the fault locator is highly insensitive to variations in local and remote source impedances and this permits accurate fault location under a wider range of system fault conditions.

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