城市地下综合管廊内高压输电线对钢制管道电磁干扰的研究

Research on the Electromagnetic Interference of High Voltage Transmission Lines on Steel Pipelines in Urban Underground Comprehensive Pipe Corridors

近些年国内外管廊运行中发生的事故层出不穷,尤其是随着电力电缆、燃气、热力管线入廊,使得管廊风险因素大大提高,而廊内管道受电磁干扰引起管道破坏并导致人员伤亡是城市地下综合管廊安全运行的最主要安全隐患。为了掌握廊内管道受高压输电线电磁干扰的影响因素及规律,给管廊的建设提供技术支撑,通过专业分析软件CDEGS模拟研究了廊内高压输电线对廊内管道电磁干扰的影响。结果表明:管道上感应电压和感应电流随着高压线电压和土壤电阻率的增大而增大,随着管道与高压线之间距离增大先急速减小后缓慢减小,管道规格对感应电压和感应电流的影响不大,感应电压随着防腐层电阻率增大先增大后趋于稳定,感应电流随着防腐层电阻率增大先减小后趋于稳定。

In recent years,many accidents occurred in the operation of pipe corridors at home and abroad.Especially with the entrance of power cables,gas and thermal pipelines,the risk factors of the pipe corridors were greatly increased.Pipeline damage and operators suffered injuries and deaths caused by electromagnetic interference of the pipeline in the corridor were the most important safety hazards for the safe operation of urban underground comprehensive corridors.In order to find out the influencing factors and laws of electromagnetic interference of high voltage transmission lines in the pipe corridor,and to provide technical support for the construction of corridors,the professional analysis software CDEGS was used to simulate the influence of the high voltage transmission lines in the corridor on the electromagnetic interference of the pipeline in the corridor.Results showed that the induced voltage and induced current on the pipeline increased with the increase of high voltage line voltage and soil resistivity,and firstly decreased rapidly and then slowly decreased with the increase of the distance between the pipeline and the high voltage line.The pipeline specifications had little effect on the induced voltage and induced current.As the resistivity of anti-corrosion layer increased,the induced voltage first increased and then tended to be stable,whereas the induced current decreased first and then tended to be stable.