At present, the state attaches more and more importance to the rapid disposal and solution of single-phase grounding fault. The State Grid "Distribution Network guidelines" requires isolation of small current grounding fault. At the same time, China Southern Power Grid is also actively promoting the automatic tripping of small current grounding fault.
Small current grounding line selection device has automatic tripping function, which can not only retain the advantages of instantaneous grounding fault self-healing of small current grounding system, but also avoid long-term harm. Improve the single-phase grounding fault fast disposal ability, reduce the risk of cable channel fire or large-area power outage caused by single-phase grounding fault of distribution cable.
To prevent phase to phase fault caused by overvoltage.
Timely remove the faults of electric shock, wire falling to the ground and tree flash.
Through load transfer, the scope of power failure is reduced.
The small current grounding line selection device of industrial control computer has the function of grounding protection tripping (closing), and the tripping (closing) function can be connected to the protection tripping (closing) circuit. When the fault occurs in the small current system, after the line selection function is triggered by the small current grounding line selection device, the device will automatically trip. Firstly, the fault is quickly cut off to ensure safety, and secondly, the accuracy of line selection is verified. In addition, the tripping (closing) function and delay function of IPC grounding line selection device can be set independently according to different lines. The function of time delay is to prevent the small current grounding line selection device from tripping immediately when the branch is touched by the wire in windy weather, resulting in voltage rise or other phenomena. This kind of trip is meaningless, but it will affect the following users, so it will delay the trip to check the duration of this phenomenon.
