铁路信号电源系统SPD有效防雷连接问题的研究

Research on the Effective Lightning Protection Connection Problem of SPD in Railway Signal Power System

电源防雷箱的合理接线对信号电源系统的防雷十分关键。针对防雷接线的电路模型进行计算分析,计算数据表明:连接线长度和截面大小会大大影响加在信号电源上的残压分布。得出连接导线的正确选用对充分发挥SPD防雷保护功能的重要性,通过工程优化接线提出了较好解决缩短SPD支路线缆的长度办法:一般要求接线总长度小于0.5m;并对连接导线的截面选择提出了合理建议:在LPZ1区和LPZ2区或更高防护区交界处选用截面积至少6mm2的SPD连接导线。

The reasonable connection in Lightning protection box is critical to lightning protection of signal power system. The lightning protection connection circuit model is calculated and analysed. The calculated data show that the cable length and cross-sectional size will greatly affect the distribution of the residual voltage in the signal power, and correct selection of connection mode is important to the ng protection function of SPD. A better solution to shorten the length of the SPD branch cable through the engineering optimization is proposed to which the total length of the connection wire should be less than 0,5m; the cross-section requirement is given that, at least 6mm2 of the cross-section of the SPD connection conductor is needed in the zone of LPZ1 and LPZ2 or higher protection zone.