Three Phase Transmission Line Fault Analysis by Using Matlab

Abstract

Power system fault analysis is a process which determines the bus voltages and line currents during the occurrence of various types of faults. Faults on power systems can be divided into three-phase balanced faults and unbalanced faults. Three types of unbalanced fault occurrence on power system transmission lines are single line to ground faults, line to line faults, and double line to ground faults. Fault studies are used to select and set the proper protective devices and switchgears. The determination of the bus voltages and line currents is very important in the fault analysis of power system. The process consists of various methods of mathematical calculation which is difficult to perform by hand. The calculation can be easily done by computer which is generated by a Simulink developed using MATLAB. However, in the conventional short circuit study there arises an error while doing Y-bus to Zbus inversion for a big bus system. To minimize the error, this paper provides a solution which is solved through “MATLAB SIMULINK”.