高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2014年
5期
14-17
,共4页
于凯%朱峰%严加斌%邱日强
于凱%硃峰%嚴加斌%邱日彊
우개%주봉%엄가빈%구일강
直流杂散电流%高速铁路%电位梯度%测试
直流雜散電流%高速鐵路%電位梯度%測試
직류잡산전류%고속철로%전위제도%측시
DC Stray Current%High-speed Railway%Potential Gradient%Testing
为了解高速铁路产生的杂散电流是否含有直流成分,近期在成都-都江堰高速铁路某段进行了杂散电流测试,通过测量机车通过时走行轨附近的地表直流电位梯度,来判断直流杂散电流的强度及其变化规律。测试结果表明当该高速铁路供电段有机车通过时,轨道附近存在非常明显的直流杂散电流,距轨道10 m处最大地电位梯度可达120 mV/m,30 m处最低为2 mV/m,地电位梯度在垂直轨道的方向上变化较大,测试点的最大地电位梯度并不出现在机车通过该测试点时,而是存在一个延迟时间。根据测试结果,建议高速铁路的轨道要注意防止直流杂散电流的腐蚀,并且高速铁路附近的埋地金属管网,有必要采取防止直流杂散电流腐蚀的措施。同时测试结果也提出了一个问题：为什么高速铁路运行时会产生大量直流性质的杂散电流？该测试结果将为接下来的研究提供依据。
為瞭解高速鐵路產生的雜散電流是否含有直流成分,近期在成都-都江堰高速鐵路某段進行瞭雜散電流測試,通過測量機車通過時走行軌附近的地錶直流電位梯度,來判斷直流雜散電流的彊度及其變化規律。測試結果錶明噹該高速鐵路供電段有機車通過時,軌道附近存在非常明顯的直流雜散電流,距軌道10 m處最大地電位梯度可達120 mV/m,30 m處最低為2 mV/m,地電位梯度在垂直軌道的方嚮上變化較大,測試點的最大地電位梯度併不齣現在機車通過該測試點時,而是存在一箇延遲時間。根據測試結果,建議高速鐵路的軌道要註意防止直流雜散電流的腐蝕,併且高速鐵路附近的埋地金屬管網,有必要採取防止直流雜散電流腐蝕的措施。同時測試結果也提齣瞭一箇問題：為什麽高速鐵路運行時會產生大量直流性質的雜散電流？該測試結果將為接下來的研究提供依據。
위료해고속철로산생적잡산전류시부함유직류성분,근기재성도-도강언고속철로모단진행료잡산전류측시,통과측량궤차통과시주행궤부근적지표직류전위제도,래판단직류잡산전류적강도급기변화규률。측시결과표명당해고속철로공전단유궤차통과시,궤도부근존재비상명현적직류잡산전류,거궤도10 m처최대지전위제도가체120 mV/m,30 m처최저위2 mV/m,지전위제도재수직궤도적방향상변화교대,측시점적최대지전위제도병불출현재궤차통과해측시점시,이시존재일개연지시간。근거측시결과,건의고속철로적궤도요주의방지직류잡산전류적부식,병차고속철로부근적매지금속관망,유필요채취방지직류잡산전류부식적조시。동시측시결과야제출료일개문제：위십요고속철로운행시회산생대량직류성질적잡산전류？해측시결과장위접하래적연구제공의거。
In order to know whether there is DC current in the stray current produced along the high-speed railway or not, a testing was carried out at a section of Chengdu-Dujiangyan high speed railway recently. DC stray current intensity and variation is adjudged by measuring the surface DC potential gradient near the running rail when the locomotive is passing through. The results show that there is obvious DC stray current near the track when the locomotive is passing through the power supply section of high-speed railway, where the maximum potential gradient is 120 mV/m at the test point 10 m far away from the track and the minimum value is 2 mV/m at the test point 30 meters away from the track. The change of ground potential gradient in the direction perpendicular to the track is bigger than that in the direction par-allel to the track. The max value of potential gradient does not appear when the locomotive is passing through the testing point, but there is a time delay. According to testing results, it is suggested that the track of high speed railway and the buried metal pipe network near it should be protected from corrosion of DC stray current. The testing result also raises a question:why a large amount of DC stray current exists along the High speed railway when the train is running? The re-sult will provide a basis for future researches.
