Power distribution network branch line grounding fault positioning system

The utility model discloses a branch line grounding fault positioning system of a power distribution network. The invention belongs to the technical field of power generation and power supply, and discloses a water-saving device for a pumped storage power station. The system comprises a power supply network, a plurality of power utilization units connected to the power supply network and a plurality of pumped storage power stations arranged at different positions. The pumped storage power station comprises a reservoir, a water turbine and a pipeline, wherein the two ends of the pipeline are inbutt joint with a water outlet of the reservoir and a water inlet of the water turbine respectively and can guide water in the reservoir to the water turbine. A memory, a grid-connected device and acontroller are respectively arranged in the pumped storage power station; the grid-connected device comprises a first transformer, a first voltage sampling circuit, a switch K1, a charger, an energy storage battery pack, a swi