高速铁路变电所回流异常的分析

Analysis of Abnormal Return Current in Power Supply Substation of High-speed Railway

高速铁路牵引供电回流系统作为高速铁路重要组成部分,而回流比例作为联调联试重要的一个检测指标,保证正常的回流比例至关重要。牵引所回流系统容易存在以下问题:一是变电所主回流比例轨回流占比小,地回流占比大;二是轨回流回所路径存在迂回。通过对钢轨对地电位主要因素即钢轨对地漏泄阻抗、钢轨回流长度与钢轨电位、钢轨点位高低受牵引供电方式影响的分析,得出地回流比例是否在正常范围内,变电所回流点的钢轨对地电位是否满足要求。若不满足要求,可通过牵引所回流模型的建立,提出合理的整改方案,针对性采取措施,逐项对结合部间进行排除,以期整治后的回流比例达到线路运营要求。

The traction power supply and return system of high-speed railway is an important part of high-speed railway,and the reflux ratio is an important indicator of joint commissioning and joint test,so it is very important to ensure the normal return ratio.The following problems are easy to exist in the traction station reflux system:first,the proportion of the main return proportional rail is small,and the proportion of ground return is large;Second,there is a detour in the path of the rail return.Through the analysis of the main factors of rail to ground potential,namely,the leakage resistance of rail to ground,the influence of the rail return length and rail potential,the rail point position on the traction power supply mode,it is concluded that whether the ratio of ground return is within the normal range and whether the rail to ground potential at the return point of substation meets the requirements.If the requirements are not met,reasonable rectification scheme can be put forward through the establishment of the reflux model of traction station,and measures shall be taken to eliminate the combination parts one by one,so as to achieve the return ratio after the rectification to meet the line operation requirements.