Event under the auspices of the Ministry of Economy of Slovak Republic

Experimental investigation of electric arc characteristics

Pavel Kireev
Department "Electric stations and electric power system

*Ivan Nagay
Department "Electric stations and electric power systems" Platov South-Russian State Polytechnic University (NPI)

Vladimir Nagay
Department "Electric stations and electric power systems" Platov South-Russian State Polytechnic University (NPI)


     Last modified: 2017-06-16

Abstract
The purpose of the investigation was creation of the mathematical tool for determining the parameters of the arc resistance at the fault location for the subsequent analysis of the operation of relay protection devices. The article presents the results of mathematical modeling and experimental studies of the arc resistance of an electric arc in the place of short circuit made at the Department of Electric power stations and electric power systems at the Platov SRSPU (NPI). A mathematical model of the electric arc column is developed on the base of the provisions of classical thermodynamics and physics of low-temperature plasma and takes into account a number of influencing factors: the nominal voltage and power of the source of electrical energy, the length of the arc, the material of the elements between which its existence is observed, composition and thermodynamic parameters of the environment. There is regression dependence of the electrical conductivity of the plasma of the low-voltage electric arc on the temperature at constant pressure, that was obtained by the authors experimentally. The results of calculating the combustion mode of the column of an low-voltage electric arc with a length of 18 mm. in the open air using this regression dependence are shown. The results of calculating the current-voltage characteristic of a column of an electric arc 0.6 m burning in an electric grid 6 kV between copper parts and parameters of a similar arc obtained experimentally are also given. The error in calculating the parameters of this high-voltage arc does not exceed 10%. The possibility of reducing the calculation error exist and is provided that the dependence of the electrical conductivity of the plasma of the high-voltage electric arc on the temperature and pressure is refined by additional experiments. A high degree of convergence of the experimental and calculated results confirms the possibility of using the results obtained in the analysis and development of new algorithms for the operation of high-speed relay protection devices.

 

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