One-phase grounding hierarchical or integral wire-selective device for high-voltage grid

Abstract

The invention relates to a high voltage earth protective device of an electric power system, in particular to a high voltage network single phase earth classification and integral route selection device. The device comprises a main transformer substation and branch transformer substations, communication devices connected with each other are arranged equally between route selection devices of the main transformer substation and each branch transformer substation, the route selection devices in each branch transformer substation is used cooperatively with the route selection device in the main transformer substation through communication devices; and the route selection devices in the main transformer substation and each branch transformer substation comprise a signal collection board, a signal converter, a main board, a display and a power panel. The route selection device can effectively distinguish the earth fault of each branch transformer substation from the earth fault of the main transformer substation, prevent false alarm from occurring in branch transformer substations, accurately select single phase earth fault, greatly improve processing efficiency of earth fault, reduce work intensity of power supply and maintenance personnel, improve operating rate of power supply system, and ensure safe operation of the power supply system.

Description

technical field [0001] The invention relates to a high-voltage grounding protection device for a power system, in particular to a single-phase grounding classification and overall line selection device for a high-voltage power grid. Background technique [0002] At present, in my country's power system, the 6-35KV power supply system generally adopts the low-current grounding method, especially the system that adopts the arc-suppression coil grounding method. The function of the high-voltage grounding line selection device is to correctly select the grounding line when a single-phase grounding fault occurs in the power supply system, so that maintenance personnel can quickly find out the fault point and quickly eliminate the fault. [0003] The traditional high-voltage grounding line selection device (commonly known as the small current grounding line selection device) is usually installed in the main drop substation and one in each sub-substation. The grounding line selecti...

AI Technical Summary

Problems solved by technology

[0004] The design concept of the present invention is to provide a single-phase grounding classification and overall line selection device for high-voltage power grids with simple structure and accurate line selection for the defects of low accuracy of existing line selection devices.

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