杂散电流下管道电参数波动特征的傅里叶分析

阐述傅里叶变换应用现状,针对燃气埋地管网受动态杂散电流干扰现状,为了更贴合实际服役环境开展实验室模拟实验,利用快速傅里叶变换对监测数据进行分析,提取动态直流及动态交流的管道电参数波动特征及干扰规律。结果表明:对于动态直流干扰和动态交流干扰分别用管地电位,交流干扰电压进行快速傅里叶变换后,有明显的幅值和频率分布特征。地铁干扰最大信号强度的频率为0.006 Hz及0.007 Hz,主要干扰周期处于143~167 s,大部分干扰周期区间处于50~200 s;电气化铁路干扰主要干扰周期处于345~625 s,大部分干扰周期区间大于100 s。

Fourier Analysis of Fluctuation Characteristics of Pipeline Electrical Parameters under Stray Current

The application status of Fourier transform is described.Aiming at the current situation of gas buried pipeline network being disturbed by dynamic stray currents,in order to carry out laboratory simulation experiment more in line with the actual service environment,the fast Fourier transform is used to analyze the monitoring data,and the fluctuation characteristics and the interference law of pipeline electrical parameters of dynamic DC and dynamic AC are extracted.The results show that there are obvious characteristics of amplitude and frequency distribution after Fourier transform with pipe-to-soil potential and AC interference voltage for dynamic DC interference and dynamic AC interference,respectively.The analysis found that the frequency of maximum signal intensity of subway interference is 0.006 Hz and 0.007 Hz,the main interference period is around 143 to 167 s,and most of the interference period is 50 to 200 s.The main interference period of electrified railway is 345 to 625 s,and most of the interference period is greater than 100 s.