Chengshi guidao jiaotong yanjiu (Aug 2024)
Electromagnetic Field Analysis of Dual-power Traction Power Supply System in Rail Transit Depot under AC-DC Switching Power Supply Mode
Abstract
Objective The AC-DC (alternating current-direct current) dual-power traction power supply system depot features densely distributed tracks and relatively close catenary clearance. Different power supply modes can affect the distribution of electromagnetic fields in depot spatially. Therefore, it is necessary to analyze the electromagnetic field of rail transit depot dual-power traction power supply systems under AC-DC switching power supply mode. Method Taking the Shuangfu Depot on Tiaodeng-Jiangjin Line of Chongqing City Railway as the basis, a simulation model of depot AC-DC dual-power traction power supply system is constructed using CDEGS software, and the characteristics of spatial electric and electromagnetic field intensity distribution in the depot under different operating conditions are analyzed. Regarding the abnormal voltage phenomenon on catenary in depot garages, the impact of electromagnetic field spatial distribution in dual-power traction power supply system depot on the induction voltage of catenary is comprehensively evaluated, and corresponding suppression measures are proposed. Result & Conclusion Under both AC and DC power supply modes, the spatial electric field of catenary is symmetrically distributed around the charged conductors in general, but the spatial magnetic field is not entirely symmetrically distributed. The more charged conductors there are, the greater intensity of spatial electric and electromagnetic fields. Under AC power supply mode, the magnitude of static induction voltage of surrounding conductors is related to the spacing between conductors and the voltage. Electromagnetic induction voltage is proportional to current. When using DC power supply mode, the conductor static induction voltage under various working conditions all exceeds the human safety limit of 36 V.
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