基于GPS同步的电气化铁路故障测距参数校准技术研究

GPS Synchronization-based Study on Fault Location Parameter Calibration Technology for Electrified Railway

针对电气化铁路故障测距系统的参数不能有效、准确整定,故障定位误差偏大的现状,研究了基于GPS同步的电气化铁路故障测距参数校准技术。在供电臂区段内设置一台机车取流,摄像机录取机车所在位置的公里标,将公里标换算成带时标的变电所与机车之间的距离;分别在变电所、分区所、AT所各设置一台数据采集仪,采集同一时刻各所负荷电流;计算出机车与变电所之间的接触网电抗值;机车移动,重复上述过程,即可得到供电臂电抗距离定值表。该技术不需要经过接地短路试验,可准确定位故障点,误差不超过200 m,有效提高了电气化铁路故障测距的精度。

With regard to the current situation that the parameters of electrified railway fault location system cannot be adjusted effectively and accurately and the fault location error is too large,the parameter calibration technology of electrified railway fault location based on GPS synchronization is studied.The test is carried out by setting a locomotive to collect current in the feeding section,recording the kilometer mark at the location of the locomotive by the camera,converting the kilometer mark into the distance between the substation with time mark and the locomotive,with a data acquisition instrument setting in the substation,section post and AT post respectively to collect the load current of each post at the same time,then calculating the catenary reactance between locomotive and substation;after the locomotive moves and repeats the above process,then the reactance distance setting table of the feeding section can be obtained.The technology can accurately locate the fault point without earthing short circuit test,and the error is not more than 200 m,it is able to effectively improve the accuracy of fault location of electrified railway.