| DONG Liang,YAO Zhi-lin,GE Cai-gang,SHI Chao-jie,CHEN Jin-ze.Fourier Analysis of the Fluctuation Characteristics of Pipe-to-Soil Potential under Metro Stray Current Interference[J],50(2):294-303 |
| Fourier Analysis of the Fluctuation Characteristics of Pipe-to-Soil Potential under Metro Stray Current Interference |
| Received:July 05, 2020 Revised:September 14, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.031 |
| KeyWord:buried pipeline, metro, stray current, pipe-to-soil potential, fast Fourier transform, interference frequency |
| Author | Institution |
| DONG Liang |
Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, Changzhou University, Changzhou , China |
| YAO Zhi-lin |
Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, Changzhou University, Changzhou , China |
| GE Cai-gang |
Beijing Cathtop Technology Co., Ltd, Beijing , China |
| SHI Chao-jie |
Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, Changzhou University, Changzhou , China |
| CHEN Jin-ze |
Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, Changzhou University, Changzhou , China |
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| Abstract: |
| In order to identify the fluctuation characteristics of pipe-to-soil potentials on buried pipelines with metro stray current interference, 24-hour pipe-to-soil potentials were tested on interfered buried pipelines which were close to the metro system in four cities including Shanghai, Guangzhou, Shenzhen and Wuhan. Then, fast Fourier transform (FFT) on those pipeline potential data was conducted by ORIGIN software, and the interference frequency was analyzed in different cities. The results showed that the pipe-to-soil potential responds quickly to stray current interference, and obvious amplitude and frequency distribution characteristics was found based on the on potential of buried pipeline after Fourier transform. The ranges of frequency with larger amplitude are close to each other, and the main interference frequencies with the largest amplitude are the same during different periods of interference. The ranges of dominant interference frequency of metro stray current in Shanghai, Guangzhou, Shenzhen and Wuhan test locations are 6~33 mHz, 5~37 mHz, 6~18 mHz and 4~36 mHz, respectively, and the main interference frequencies of metro stray current in four cities are 9 mHz, 7 mHz, 7 mHz, and 5 mHz, respectively, which are consistent with the main locomotive driving intervals between the stations of the nearby metro. Therefore, the interference cycles of metro stray current are determined by the locomotive driving intervals between metro stations. It can be concluded that the interference frequency range and distribution characteristics of the pipe-to-soil potential under the interference of metro stray current can be obtained after Fourier transform, and the interference source of metro stray current can be identified based on the correlation between the range of frequency characteristics obtained by FFT method and the locomotive driving intervals of metro system, which can provide reference for pipeline protection and experimental research on stray current corrosion. |
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