Small current grounding device for 10KV line of 35KV transformer substation

The invention discloses a small current grounding device for a 10KV line of a 35KV transformer substation. One end of the device is connected with a 10KV bus bar of the transformer substation, and the other end of the device is connected with a grounding grid of the transformer substation; the small current grounding device comprises three split-phase vacuum switches, an outgoing line zero sequence current transformer, a grounding protection device, a grounding line selecting device and a driving locking unit, wherein the grounding protection device and the grounding line selecting device are respectively connected to the outgoing line zero sequence current transformer; the three split-phase vacuum switches are respectively connected to the driving locking unit and are connected with the 10KV bus bar; when a circuit is grounded, the split-phase vacuum switches are started, and the grounding phases of the split-phase vacuum switches are directly connected to the ground. The small current grounding device is based on the fact that much inconvenience is brought to line patrol personnel of a power supply station and accidents are easily caused as a single phase of the circuit in a rural network power supply system is easily grounded due to the factors of lightning stroke, trees and the like; through the introduction of the low current grounding device, the petrol time is shortened to a greater extent, and convenience is brought to the safe operation of equipment.