| ABSTRACT:In the railway stations of Beijing-Shanghai high-speed, there is the issue that rail and glued insulated joint were burned by arc, which not only lower the life-span of rail, but also influence the safety of train running. Field test was performed in Cangzhou West Station, where the arc burning was more serious, then the mechanism of arc burning was studied, considered the potential difference among the insulated joint and the discharge current of EMU, two feasibility reports of arc suppression were discussed based on the single-ended return conditions; the optimize report of arc suppression under bidirectional return condition was proposed by connecting the chokes off point through using the reactor, At last, whether broken rail detection can be guaranteed using the ZPW-2000A integration in station track circuit under bidirectional return condition was validated. The study can provide the technical and theoretical support to the upgrade of other Beijing-Shanghai high-speed railway stations.The main work and results are as follows:(1) Potential difference between both ends of the insulating section is a necessary condition of creating and maintaining Arc burning,when the conecting of wheel and rail currrent cut off,,it main occur arc,the more current cun off and voltage maintained,the stronger burned level of insulating section of arc burning and rail;study found:When EMU side of the road passes through insulated strands Day, if the node voltage insulation U≤20V, will not appear obvious arc, it can effectively improve the arc ignition and insulated rail section.(2) under the condition of Single-ended reflux, and through the Cutoff point comparative analysis of CRH380AL and CRH380BL providing a advice that transforming the Grounding method of emu. perfect dispersion grounding of Emu running grounding design can effectively improve the arc. The issuses proposed that cut-off point set at the point of moving car after pulling off the current when a smaller area, namely the cut-off point is set to take the car into the side of the road can be effectively reduced the extent of burning arc.(3) Using the Cangzhou West Station simulink simulation model can accurately calculate the cut-off point at both ends of the potential difference between the insulation section.. The same time, taking advantage of the model simulation of the impact of rail-to-ground leakage resistance of insulation energy-saving potential difference, the greater the resistance to leakage, the higher the insulation saving difference, arc intensity is comparatively higher and higher in the high-speed rail station earth leakage resistance, while the existing line leakage resistance is relatively small, it is also obvious arc burning insulation sections of rail and the main reason for the emergence of high-speed rail station. Simulating the reactor through the two-way communication cut-off point of the solution under reflux and the end section of the insulating arc will not be significant when the calculated value of the inductance of the reactor is less than550μH.(4) Based on the need of integration of the ZPW-2000A Track circuit rail inspection, demonstrated the feasibility of bi-reflux program. When according to the most adverse conditions, that does not consider external circuitous loop impedance through the cut-off point connectivity187μH hollow Inductance can achieve broken rail inspection; inductance value of the Inductance is less than550μH, can effectively suppress the arc burning rail and insulation section. Bidirectional reflux solutions not only solve the broken rail track circuit inspection, and effective inhibition of the arc, but also the traction current is more than a redundant channel, reducing other more fault... |
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