Abstract
Stray current directly affects the regular operation of electrical equipment and facilities in the subway DC traction power supply system. Therefore, it is worthwhile to study the stray current distribution characteristics during train operation and the quantitative corrosion of buried pipelines. This paper introduces the traction characteristics of power carriages and power wheelsets of subway vehicles into the DC traction process. A finite element model considering the dynamic distribution of stray current under the actual operation of subway vehicles is established. The interference characteristics of stray current and the contribution of power sources under the multiparticle model are analyzed. The rail insulation damage caused by long service time and the quantitative calculation of rail and buried pipeline corrosion is considered. The model results show that the stray current in the buried pipeline under the multiparticle model is more accurate and more suitable for the protection in the actual subway. The quantitative corrosion of the buried pipeline is stronger than the partial insulation damage environment when the rail is not insulated. The rail and buried pipeline corrosion at both ends of the insulation damage position is relatively severe. The stray current distribution model established in this paper gives full play to the solution advantages of the finite element method and provides a new idea for the quantitative calculation of buried pipeline corrosion.
Highlights
With the development of China’s national economy and the promotion of urbanization, urban rail transit has been vigorously developed as an effective tool to alleviate traffic congestion
DC electric traction is adopted in urban rail transit systems such as subway and light rail. e train receives power through the pantograph or collector boots, and the rail is used to achieve reflux
In the initial stage of subway operation, the degree of insulation between the steel rail and the underground metal structure is relatively high, the rail-to-ground transition resistance is rather large, and the stray current leaking from the steel rail to the surrounding soil medium is relatively small
Summary
With the development of China’s national economy and the promotion of urbanization, urban rail transit has been vigorously developed as an effective tool to alleviate traffic congestion. (3) According to the distribution of rail potential and current density of buried pipeline, the cathode area and anode area of the buried pipeline at any time are determined, and the relationship between current leakage position and buried pipeline corrosion under different conditions is analyzed. E content of this paper is arranged as follows: Section 2 shows the theoretical analysis modeling process and solution process of corrosion current on the buried pipeline; Section 3 discusses the distribution characteristics of rail potential and stray current under the condition of multiparticle distribution; Section 4 gives the dynamic cathode and anode area changes of stray current, the corrosion accumulation of metal structures, and the insulation damage of some areas causing new stray current interference.
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