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铁路贯通线采用全电缆模式已经在合宁、青藏铁路得到应用,为了提高铁路供电可靠性,高速铁路贯通线采用全电缆已成为趋势.电缆贯通线适合采用低电阻接地系统。利用EMTDC对小电阻接地系统全电缆贯通线故障自动重合闸进行大量仿真分析,结果表明:重合闸操作过电压不超过电缆冲击耐压水平,重合闸冲击电流也不高于电缆热稳定电流,重合闸是提高供电可靠性必要的可行方案.
It has become a trend that the whole cable is used in the railway through lines and the Qinghai-Tibet Railway has been applied. In order to improve the reliability of railway power supply, it has become a trend to adopt full cables for high-speed railway. EMTDC is used to simulate the automatic reclosing of all cable through lines in the small resistance grounding system. The results show that the reclosing overvoltage does not exceed the level of cable impulse withstand voltage and the reclosing impulse current is not higher than the thermal stability of cable. Brake is to improve the reliability of power supply necessary solutions.