Use of the Fourie transform algorithm for improving phase to the earth fault protection in distribution electric networks.
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2018, Vol 1, Issue 1
Abstract
New algorithms of selective protection against phase-to-earth faults in compensated power supply systems with a voltage of 6-35 kV are developed, in which, due to the influence of the Petersen coil, the selective action of traditional protective devices is not provided. The mathematical modeling showed that, at frequencies of 200 -400 Hz, the Petersen coil practically does not reduce the capacitive current in the damaged connection due to phase-to-earth faults, as opposed to how it occurs at a frequency of 50 Hz. Therefore, the currents and voltage of one of the frequencies from the specified range (for example, 250 Hz), which are emitted from currents and voltages of zero sequence using the Fourier transform algorithm, are used for protection. Also, several selectable frequencies can be used to increase security reliability. The scientific novelty consists in using the Fourier transform algorithm to determine the components of the voltage and current of the zero sequence of a higher frequency than the power supply frequency of the network, which allows for the selective phase-to-earth protection of the reactive power, which is calculated o n the selected frequency with the help of allocated currents and voltages. The algorithms of protection work and the results of its research on metal and arc phase faults on the ground are given. The effectiveness of the developed protection is confirmed by the results of mathematical modeling.
Authors and Affiliations
V. F. SYVOKOBYLENKO, V. A. LYSENKO
Keywords
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