Publication: A pratical method for fault location determination on power transmission line
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Date
2007-05-01
Authors
Wong, Tai Tiong
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Abstract
This project studies the practical method for fault location determination for single phase to ground fault on short type transmission line. When a fault occurs on power transmission line, it is very important to detect the fault location in order to restore the electricity as soon as possible to minimize the interruption of power supply. In this project, a simple fault location determination method is proposed based on impedance-based fault location techniques. The main idea of the method is by injecting two identical voltages to both end of fault phase transmission line, measuring the value of voltage and fault currents, and solving an equation to determine the fault location of the fault point. The mutual inductance effect toward the fault phase is ignored since there will be no current flow if the fault is not occur at the tested phase. This idea has been proved useful by using simulation and experiment in laboratory. The calculated fault location in simulation and experiment is independent from the fault current and the fault resistance. Besides, a fault location program is developed based on the fault location method proposed using C++ programming language. The program can be use to estimate the fault point on the transmission line using the information including line impedance, fault resistance and fault current. By using this program, the fault location on transmission line can be estimated quickly and accurately. For future development, it is hope that the fault location method can be used to determine fault location for all kind of faults for longer length of transmission line.