客运专线综合接地系统方案研究

高速运行的客运专线列车,其机车牵引的工作电流将达到近千安培。强大的电流通过钢轨时,电磁耦合作用使线路附近的金属体表面产生较高的感应电压。在不影响通信信号等弱电系统安全运行的前提下,在距接触网带电体5m范围以内的电气化、电力、通信、信号、车辆、给排水等专业的设备及其他金属构筑物的接地,利用接触网回流线构成综合接地系统,形成等电位体。客运专线的列车运行速度为300～350km/h时,综合贯通地线的截面积至少为70mm2;速度为200～250km/h时,综合贯通地线的截面积最好选取35～50mm2,以满足综合贯通地线的接地电阻≤1Ω的要求。

Research on Comprehensive Grounding Plan of PDL

The working circuit of locomotive traction for PDL trains in high speed running will reach one thousand Ampere. When the strong circuit passes the rail, electromagnet coupling function will make metal body produce high induced voltage. In the premise of non- influence to the safe operation of weak electric system, the grounding of equipment such as electrification, power, communications, signal, rolling stock, water supply and drainage, within 5m away from catenary electrified body, will adopt catenary return wire to form comprehensive grounding system, that is equal electric potential body.