- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIU Feilong, LIU Wei, YANG Shuangrui. Connection Scheme of Stray Current Collection Network for DC Traction Power Supply System[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20260049
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To address DC interference in surrounding power systems and damage to urban pipeline networks caused by stray currents, a novel optimization scheme for the stray current collection network is proposed, in which a continuous cable is used to connect the trackbed reinforcement. The underlying mechanism through which this scheme influences the effectiveness of stray current protection is also systematically investigated. Based on the proposed continuous cable connection scheme, a four-layer return current model of a DC traction power supply system was developed to account for the stray current collection network. The boundary element method was then employed to couple the leakage current from the stray current collection network with the return current system model, thus improving simulation accuracy. The simulation accuracy of the proposed model was verified by scaled simulation experiments. A metro project in China was used as a case study to quantitatively analyze the effects of the conventional cross-connection method using 95 mm2 cables and the continuous cable connection method on secondary stray current and the earth potential gradient. The results show that the average simulation error is 11.76%. When a 95 mm2 cable is used directly for cross-connection and the rail-to-earth transition resistance is less than 7.72 Ω•km, the earth potential gradient along the entire line remains below 2.5 mV/m. When a 120 mm2 continuous cable is used for connection and the rail-to-earth transition resistance is less than 5.37 Ω•km, the earth potential gradient along the entire line remains below 2.5 mV/m. Using a continuous cable connection can significantly reduce stray current. Using a 120 mm2 continuous cable for connection reduces the secondary stray current by 36.59% and the earth potential gradient by 35.28% overall. Using a 200 mm2 continuous cable for connection reduces the secondary stray current by 47.30% and the earth potential gradient by 46.89% overall.
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