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| Numerical Simulation of Stray Current Interference Rules on Buried Pipeline from Metro System under Different Operative Modes |
| Received:October 11, 2020 Revised:November 14, 2020 |
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| DOI：10.7643/issn.1672-9242.2021.04.005 |
| KeyWord:metro system, stray current, influence laws, numerical simulation, buried pipeline, operating condition |
| Author | Institution |
| DONG Liang |
School of Petroleum Engineering, Changzhou University, Changzhou , China |
| CHEN Jin-ze |
School of Petroleum Engineering, Changzhou University, Changzhou , China |
| YAO Zhi-lin |
School of Petroleum Engineering, Changzhou University, Changzhou , China |
| SHI Chao-jie |
School of Petroleum Engineering, Changzhou University, Changzhou , China |
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| Abstract: |
| Stray current interference on nearby buried pipeline from metro system under variable operating conditions is complicated, so that the interference rules are difficult to obtain through field tests. In this paper, a numerical simulation model including an entire metro system with multiple traction sections, drainage network, grounding systems in stations and a parking lot, the buried pipeline and its cathodic protection system are constructed. Based on the numerical simulation method and professional software, the potential distribution of rail to earth, the leakage stray current density distribution from rail and drainage network, the stray current flow of grounding systems and a parking lot, and the potential distribution of buried pipeline under stray current interference are calculated under different metro operating conditions such as changes of the number, location and traction current of metro locomotives, the electric connections of drainage network, grounding systems and rails in the parking lot with the main track. The interference rules of stray current on buried pipeline from metro system under different operating conditions are determined. The results show that stray current interference on nearby buried pipeline occurs and is superposed from multiple traction sections with running locomotives. The maximum interference occurs at the intersection or parallel section of the buried pipeline and the track, and the smaller the parallel distance is, the closer the maximum interference level is to the interference level at the intersection. When the drainage network, grounding system in stations and parking lot track are not electrically connected with the main track, the interference level can be reduced to a certain extent. However, when the drainage network, grounding system in stations or/and parking lot track is locally electrically connected with the track, the interference level on buried pipeline will increase dramatically. The potential fluctuation of buried pipeline is caused by the change of metro operating condition, and the fluctuation degree is closely related to the running state of locomotives, the electric connection state of rail with grounding system or parking lot, the performance of drainage network and its working state, etc. Therefore, attention should be paid to the change of metro operating condition in metro stray current interference detection and protection. |
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