Technical scheme for grounding of single-core cable especially for high-speed railway

The invention relates to a technical scheme for grounding of a single-core cable especially for a high-speed railway, wherein the technical scheme is mainly suitable for a 27.5-kV single-core cable. According to the technical scheme, on the basis of characteristics of the high-speed railway traction power supply system, a 27.5-kV cable is divided into a plurality of units by combining a simulation result of a system model established by using a PSCAD/EMTDC, structural characteristics of a cable, and practical engineering information; and one end of the 27.5-kV cable in each unit is grounded directly and the other end is grounded by a protection layer voltage limiting device. The length of the cable of each grounding unit does not exceed 600m and a metal protection layer of an intermediate connector of each two grounding units is removed, thereby realizing independence of the grounding units. The cable grounding requirement at the two ends of the intermediate connector between each two grounding unit and the g