As an independent four-rail return system for urban rail transit traction power supply,it can significantly increase the transition resistance of the return rail and reduce stray currents.To study the impact of stray currents in urban rail transit using an independent four-rail return system on surrounding buried gas pipelines,the ground potential and ground potential gradient of the surrounding pipelines are tested before and after the putting into operation of the ZHENGXU line.The results indicate that the ground potential and ground potential gradient around the ZHENGXU line do not change significantly before and after the line is put into operation.
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