THE REGULARITIES OF WEAR OF A CONTACT WIRE DURING OPERATION ON THE CITY ELECTRIC TRANSPORT
Keywords:contact wire, electrical and mechanical wear, stress-strain state, current removal quality criteria
The problem of reliability and efficiency of current collection of urban electric transport has become increasingly apparent with the increase in the cost and limitations of all types of resources. This requires improving the design of current collectors, contact network, selection of materials for the contact wire, as well as research. The materials of the inherent heterogeneity of the structure of the surface layer and the concentration of clusters of defects and the localization of internal stress as a consequence of the mechanical and electrical wear. As a result, the surface of the contact wire is worn. In the framework of the challenge of ensuring quality of current collection was made complex research of intensity of wear of the contact wire for electrical transport. The main wear criterion was the minimum allowable cross-section of the contact wire.
This article describes the features of the influence of physical processes occurring in the friction pair "contact wire-current collector" taking into account the influence of factors such as mechanical load, mileage, speed, current flow time for urban electric transport. Equations are presented that describe the process of displacement along the axes that is, the wear of the contact wire using the method of decomposition of the function into an infinite sum of power functions (Taylor series), the theory of friction and wear, the theory of physical and chemical processes. On the basis of the corresponding equations obtained dependences that relate electrical, mechanical, physico-chemical and tribological characteristics of the contact wire relative to the operating conditions of urban electric transport. A mathematical model of the wear dynamics of the contact wire is obtained, which determines its wear, that is, a section is formed during operation, taking into account the influence of factors such as mechanical load, mileage, speed, time of flow of current in the friction pair "contact wire – current collector". It is shown that the use of the proposed model will create a test device for physical modeling of the main parameters of the current collector of the electric power supply system of electric transport.
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