Research on performance evaluation criterion of integrated earthing system for high-speed railway

This Paper researches the existing evaluation criterion of integrated earthing system for high-speed railway and analyzes the new problems encountered in China´s rapid development according to the fact that the integrated earthing engineering has only just begun in China, which is related to the construction of high-speed railway. For these problems, presently there isn´t any experience abroad, which can be used for reference. On this basis, in addition to theoretically analyzing the problems existing when the “evaluation criterion no more than 1Ω” is still used in the areas with larger earth resistivity in line with the overseas evaluation criterion on that the earthing resistance of integrated earthing system should not be greater than 1Ω and according to the characteristics of vast region and large distribution range of earth resistivity, this paper comes up with the new evaluation criterion on the field resistance of integrated earthing system through field test and verification and on the premise of ensuring that the integrated earthing system functions protectively, as well as the countermeasures against the problems of the integrated earthing system project of this stage in the areas with high earth resistivity.