Open AccessModeling Features of a Single Phase-to-Earth Fault in a Medium Voltage Overhead Transmission Line
Author(s) -
Ismael Kareem Saeed,
Kamal Sheikhyounis
Publication year - 2020
Publication title -
ukh journal of science and engineering
Language(s) - English
Resource type - Journals
ISSN - 2520-7792
DOI - 10.25079/ukhjse.v4n2y2020.pp127-138
Subject(s) - overhead (engineering) , electric power transmission , transmission line , electronic engineering , line (geometry) , computer science , overhead line , phase (matter) , fault (geology) , representation (politics) , harmonic , voltage , topology (electrical circuits) , control theory (sociology) , engineering , electrical engineering , physics , mathematics , telecommunications , acoustics , geometry , control (management) , quantum mechanics , artificial intelligence , seismology , geology , politics , law , political science
The modeling and calculation of a single phase-to-earth fault of 6 to 35 kV have specific features when compared with circuits with higher nominal voltages. In this paper, a mathematical analysis and modeling of a 3-phase overhead transmission line with distributed parameters consisting of several nominal T-shaped, 3-phase links with concentrated parameters replaced by 1 nominal T-shaped link were carried out. Further analysis showed that not accounting for the distributed nature of the line parameters did not cause significant errors in the assessment of the maximum overvoltage in the arc suppression in single phase-to-earth faults, and that sufficient accuracy insures the representation of the line by only 1 nominal T-shaped, 3-phase link. Such a modeling technique makes it impossible to identify the location of single-phase faults, which is the property of higher harmonic amplification of individual frequencies. Chain equivalent schemas with constant parameters are valid for a single frequency, thereby providing an opportunity to study the nature of the wave process by the discrete selection of parameters. Next in the mathematical representation, we consider the overhead transmission lines as lines with distributed parameters.