EXPERIMENTAL DEFINITION OF PRIMARY CONSTANTS OF THE ELECTRICAL TRANSMISSION LINES

Keywords: Specific parameters, constant parameters, resistivity, specific inductance, specific capacitance, specific conductivity, power line, cable line

Abstract

The article describes the method of experimental determination of the primary constants of the lines of transmission of electrical energy. Analysis of the problem on the basis of modern scientific publica-tions has been performed. It is shown that the experiment is the only reliable way to determine the constants. The use of mathematical models of field theory is impossible, since the magnetic and dielectric constant of line materials are never known for sure. The proposed method is based on accurate mathematical models of the propagation of electromagnetic waves in lines with distributed parameters. Mathematical models for a shielded line with one wire and with two wires are used. Mathematical models are obtained on the basis of Kirchhoff's laws for lines with distributed parameters and are accurate. To perform the measurements, only the simplest measuring devices are used — an ammeter, a voltmeter, and a phase difference meter. An oscil-loscope can be used as a phase difference meter. The experimental data for stranded armored cable are giv-en. Based on these data, the calculation of the primary constants. Verification of the primary constants ob-tained from the experiment was performed. For verification, the substitution of constants into a mathemati-cal model of the propagation of electromagnetic signals in lines with equal parameters was used. According to this model, voltages and currents are calculated at the beginning and at the end of the cable. Comparison of the obtained data with experimental data. The error in determining the constants was no more than 5%. The accuracy achieved is sufficient for most practical cases and can be improved by increasing the meas-urement accuracy. The proposed method for determining the primary constants is universal and can be ap-plied to all types of transmission lines of electrical energy. The article identifies possible areas for further research.

Author Biographies

Дмитро Андрійович Маєвський, Odessa National Polytechnic University
Doctor of Technical Sciences, Professor, Head Departments of Theoretical Foundations and General Electrical Engineering
Олександр Миколайович Бесараб, Odessa National Polytechnic University
  Candidate of Technical Sciences, Associate Professor, Head Department of Power Supply and Energy Management
Олександр Миколайович Семенюг, LLC "S-Engineering"
substitute Director General for Science
Олена Юріївна Маєвська, Odessa National Polytechnic University
  Candidate of Technical Sciences, Associate Professor
Published
2019-04-18
How to Cite
Маєвський, Д., Бесараб, О., Семенюг, О., & Маєвська, О. (2019). EXPERIMENTAL DEFINITION OF PRIMARY CONSTANTS OF THE ELECTRICAL TRANSMISSION LINES. Electrotechnic and Computer Systems, (30(106), 75-82. https://doi.org/10.15276/eltecs.30.106.2019.8
Section
Theoretical Electrical Engineering

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