Industrial power system faults Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/00000350t

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  • The purpose of this thesis is to represent and calculate unsymmetrical secondary faults on a grounded wye-to-delta transformer bank. This thesis is specifically concerned with the secondary connections often encountered in industrial installations. Faults on these systems have not been adequately investigated. Three types of faults are considered, namely: 1. A line-to-line fault between two phases. 2. A line-to-line fault on the center-tapped three-phase circuit. 3. A phase-to-ground fault with the opposite center-tap grounded. Unsymmetrical faults on this system cause unsymmetrical currents and voltages. The method of symmetrical components is applied to determine these currents and voltages, and this can be considered a convenient approach to solve this kind of problem. The above system calculating procedure was programmed in FORTRAN. The results are compared with the actual data taken in laboratory. The calculated results and the actual system data, recorded in the laboratory, for currents, voltages and power show a close agreement; an error of 2% or less was obtained.
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