城市轨道交通供电区间过渡电阻在线测量方法的研究

Research of On-line Measurement of Track to Earth Resistance Between Urban Rail Transit Substations

城市轨道交通轨地过渡电阻是影响杂散电流泄漏的重要原因,为此需要对过渡电阻进行测量。根据轨电位分布特点,提出利用机车运行时排流电流作为测试电源来测量轨地过渡电阻的方法。首先分析单电源供电时区间过渡电阻测量原理,给出所需测量数据,测量方法以及计算过渡电阻公式。城市轨道交通实际系统是双电源供电,即两个牵引变电所并联,因此在具体分析时,可将双电源供电等效为单电源供电。最后给出了双电源供电情况下区间过渡电阻实测系统原理图,并分析系统工作原理。

In the Urban rail transit,the track to earth resistance is a main reason of stray current leakage,so it is need to measure the resistance.Method of measuring the resistance is presented based on the characteristics of rail potential distribution,and drainage current act as the measurement power supply.First,the resistance measuring principle is analyzed when the system is single power supplied,and date needed,measurement methods and transition resistance expression are given.Actually,the system is a dual power supply,and two traction substations are in parallel.So that the dual power supply system can be equivalent to a single power when analyzed.Finally,in the case of dual power supply,measured system of the transition resistance is given,and the system principle is analyzed.