轨道交通杂散电流腐蚀的监测及防护研究

Cai bin bin, Pei li jun, Zhao chen

摘要:

南京港华燃气公司发现马群区域天然气高压管道上有强烈干扰的杂散电流存在,大大超过了行业规范《SY/T0017-2006埋地钢质管道直流排流保护技术标准》规定,该规定中提出当管道任意点的管地电位正向偏移均值大于100mV时,必须采取排流保护或其他防护措施,结合常规技术杂散电流防护存在的不足,提出了新型的监测及防护方法。本研究设计的方案采用了杂散电流补偿的方法,避免杂散电流对天然气高压管道的杂波干扰,通过设计出一套监测与防护系统,在系统中加入与地铁供电电流大小相等、方向相反的补偿电流,进而减小或抵消在特定区间内产生的杂散电流。试验结果表明,本文设计的方法大大减少了杂散电流,符合燃气管道相关标准,大大提高了轨道交通的安全性。

Abstract:

Nanjing Ganghua Gas Company discovered that there are strong interference stray currents on the high-pressure pipeline of natural gas in the Maqun area, which greatly exceeds the industry standard “Technical Standard for DC Discharge Protection of Buried Steel Pipeline SY/T0017-2006”. It is proposed that when the mean value of the forward displacement of the ground potential at any point of the pipeline is greater than 100mV, drainage protection or other protective measures must be taken. Combined with the shortcomings of conventional technology stray current protection, a new monitoring and protection method is proposed. The scheme designed in this study adopts the method of stray current compensation to avoid the clutter of the stray current to the natural gas high-pressure pipeline. By designing a monitoring and protection system, the system is added with the same magnitude and opposite direction of the subway power supply. The compensation current, which in turn reduces or cancels the stray current generated in a particular interval. The test results show that the method designed in this paper greatly reduces the stray current, which meets the relevant standards of gas pipelines, and greatly improves the safety of rail transit.