- 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: | TANG Zeyang, MEI Xin, RUAN Ling, DENG Wanting, CUI Yibo, LI Yiwen. Analysis of Influence of Urban Rail Transit Metro Lines on Direct Current at Neutral Point of Transformers[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250658
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To investigate the influence of stray currents from urban rail transit on power grid transformers, the characteristics and causes of the neutral point current of transformers along metro lines were analyzed based on long-term monitoring data from the Hubei Observation and Research Station of Earth Stray Currents and Energy Equipment Safety. First, the balance and difference in the neutral point current among transformers within the same power grid were statistically analyzed. Second, the current characteristic quantities in different power grids were compared based on the wavelet transform. Finally, the differences in current waveform characteristics before and after metro operations, as well as during different operation periods, were examined. The results indicate that stray currents generated by urban rail transit cause an imbalance in the amplitude of the neutral point current among different transformers in the same grid, with a maximum difference of over 10 times. Denser metro lines around a substation result in a larger amplitude of the neutral point current of its transformer. When metro lines and power grids are geographically closely interconnected, the similarity of neutral point current waveforms among different transformers in the grid is high, with a correlation coefficient of over 0.8. The direct current generated by some metro lines flows only between local stations in the grid, which significantly reduces the similarity of current waveforms within the grid. Within the same grid, the waveform similarity is high when the wavelet scales of the neutral point current waveforms of transformers are close; however, the wavelet characteristics of the neutral point current of transformers from different grids are not comparable. When there are obvious differences in the alignment or operation of metro lines, the influence of different metro lines on the neutral point current of transformers can be identified based on wavelet scales.
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