Performance of the integrated grounding system of hefei-nanjing passenger dedicated railway

In order to ensure the human and equipment safety, the concept and the technique of the integrated grounding system has been introduced in high speed railway engineering in China. High running speed and dispatching density lead to large traction load currents in the power supply systems. Moreover, the high speed railway widely adopt non-ballasted track, which has a relative high rail leakage resistance to the ground. This can result in very high electric potential of the rail. The integrated grounding system uses two buried bare copper wires to connect together various grounding structures along the railway properly to guarantee equipotential states of different systems and equipments. Based on the immense measured data in the field of Hefei-Nanjing passenger dedicated line, the performance of the integrated grounding system is analyzed in this paper. Some further suggestions are also put forward to improve the electric characteristics of the integrated grounding systems used in railway design.