FAULT LOCATION OF MV TRANSMISSION LINE BY USING DOUBLE ENDED IMPENDANCE METHOD

Abstract

The rapid growth of the electric power system has in recent decades resulted in an increase of the number of transmission lines and total power outage in Ethiopia. The challenge of a fast growing electrical grid has also resulted in huge increases of overhead lines and their total length. These lines are experiencing faults due to various reasons that cause major disruptions and operating costs of the transmission system operator (TSO). Thus, it’s important that the location of faults is either known or can be estimated with reasonably high accuracy. This allows the grid owner to save money and time for inspection and repair, as well as to provide a better service due to the possibility of faster restoration of power supply and avoiding blackouts. This project, therefore, will presents two-ended impedance based fault location algorithms and demonstrates its application in locating real world faults. To analyze methods, various types of faults will be modeled and simulated. Application and usefulness of the method will identified and presented in the thesis. This project will form a basis for choosing an appropriate fault location technique for electrical power transmission network. MATLAB/Simulink software will be used to implement the algorithms. The simulation results will demonstrate the validity of the suitable fault location method in transmission line