- 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: | LIN Sheng, MAO Gefan, ZHOU Qi. Calculation and Analysis of Cable Metal Sheath-to-Ground Potential Under Influence of Metro Stray Current[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20260071
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To analyze the influence of metro stray current on the cable metal sheath-to-ground potential, by considering its dual intrusion paths through the metal sheath and the ground, electrical quantity analysis models for the cable metal sheath under double-end grounding and cross-bonded grounding methods were respectively established. Based on the superposition theorem, the induced voltage and the voltage drop generated by stray current were superposed, and a calculation method for the sheath-to-ground potential at any position of the cable metal sheath under the two grounding methods was derived. The calculated values were verified by the measured current of a 110 kV cable under the cross-bonded grounding method, and the calculation results of the sheath-to-ground potential under the two grounding methods were verified based on the PSCAD simulation platform. On this basis, the proposed models were adopted to analyze the influence of stray current amplitude, frequency, and soil resistivity on the metal sheath-to-ground potential. The research results indicate that the trend of the calculated value of the cable metal sheath current is basically consistent with that of the measured value, with a relative error of 3.08%; the calculation error of the sheath-to-ground potential at the cross-bonded joint is 0.86%, and the calculation error of the sheath-to-ground potential at the midpoint position of the metal sheath under the double-end grounding method is 1.13%; under the double-end grounding method, the cable metal sheath-to-ground potential always remains within the safety limit, and when the stray current increases from 0 A to 300 A, the sheath-to-ground potential at the midpoint position of the metal sheath increases from 1.10 V to 30.25 V; under the cross-bonded grounding method, when the stray current exceeds 162 A, the sheath-to-ground potential at the cross-bonded joint exceeds the 50 V limit; the stray current frequency has no obvious influence on the amplitude of the cable metal sheath-to-ground potential under the two grounding methods but only makes the peak appear more frequently; the increase of soil resistivity raises the cable metal sheath-to-ground potential, and the raising amplitude under the double-end grounding method is more significant than that under the cross-bonded grounding method.
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