High impedance faults (HIFs) are generated when power lines down on poorly conductive surface, or have unexpected contact with neighbor objects. They have been researched and investigated for many years since they pose a threat to humans and livestock; and there are already many methods of detecting this kind of fault. An electrical model for HIF is implemented, and practical fault events from official websites of Department of Energy/Electric Power Research Institute (DOE/EPRI) National Database Repository of Power System Events are studied for developing a reliable detecting method. The occurrence of HIF is detected by applying sliding orthogonal transforms such as fast Fourier transform (FFT) and Walsh Hadamard Transform (WHT) in order to investigate its harmonic-current content and perform HIF detection. The criteria to declare the existence of fault currents are based on the threshold and shape of the magnitude and phase responses of orthogonal transformed results.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 52/05M(E), Masters Abstracts International|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be