Abstract
The paper presents a mathematical modeling approach to determine the permanent regime temperature of an electric contact found in the supply system of the railway electric traction. Mathematical modeling is a basic procedure in the preliminary determination of parameters of interest in various fields of scientific analysis. The numerical modeling method used for determining the electric contact temperature represents the base for developing a finite-element thermal model. The simulation of the electric contact was verified by an experimental infrared investigation of an electric contact realized on a realistic laboratory setup. The results interpretation reveals a good synchronization between the calculated, simulated and measured temperatures.
Highlights
In order to perform the diagnosis of the technical condition of an electrical equipment, it is necessary to know its thermal stresses
In order to implement and validate the mathematical models presented in the previIn order to implement and validate the mathematical models presented in the previous section, an experiment was carried out in the laboratory to analyze the temperature ous section, an experiment was carried out in the laboratory to analyze the temperature evolutionof ofan anelectrical electricalcontacts contactsfound foundininthe theconnection connectionconfiguration configurationofofan animpedance impedance evolution bond,which whichisisfound foundin inthe thereturn returncircuit circuitof ofthe theelectric electrictraction tractionelectricity electricitysupply supplysystem
The level of thermal stress depends on the values of the contact resistances in the contact area
Summary
In order to perform the diagnosis of the technical condition of an electrical equipment, it is necessary to know its thermal stresses. The degree of thermal stress has a direct influence on technical and economic aspects and implicitly on the maintenance of electrical equipment. Excessive heating (hyperthermia) endangers the proper functioning of the equipment and shortens its service life (operation), and too low heating (hypothermia) leads to an oversized construction, economically unreasonable [1,2,3]. The supervision of temperature in the case of equipment in operation is difficult to achieve. By directly viewing the supervised equipment, the warmest points on the current path are detected. In this way, the places where it is necessary to be intervened to restore the contact links are determinate
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