10kV power distribution network FTU (Feeder Terminal Unit)-based fault location method

Abstract

The invention discloses a 10kV power distribution network FTU (Feeder Terminal Unit)-based fault location method. The method comprises the following steps that: A, the startup threshold value Ist of afeeder terminal unit is set, wherein Ist is equal to KrelI0i; the acquired transient zero-sequence current of detection points at a bus-bar outgoing position is compared with the startup threshold value Ist of the feeder terminal unit, whether the startup condition of the feeder terminal unit is satisfied is judged, if the startup condition is satisfied, the feeder terminal unit is started, and fault information is recorded, and the method shifts to a next step of processing and calculation; B, the amplitude If of the transient zero-sequence current within T0 after a fault occurs is calculated; C, the amplitude If of the transient zero-sequence current of each detection point on each line is compared with each other, and three lines with high transient zero-sequence current amplitude If are selected; and D, small-current grounding fault location is performed according to the change condition of the amplitude of the transient zero-sequence current of each detection point on the lines selected in the step C.

Description

technical field [0001] The invention relates to a fault location method, in particular to a fault location method based on a 10kV distribution network FTU. Background technique [0002] The feeder terminal unit (FTU for short) has the functions of remote control, remote signaling, and fault detection, and communicates with the master station of distribution automation to provide the operation status of the distribution system and various parameters that are information required for monitoring and control, including switch status and power parameters. , phase-to-phase fault, ground fault, and fault parameters, and execute the commands issued by the power distribution master station, adjust and control the power distribution equipment, and realize functions such as fault location, fault isolation, and rapid restoration of power supply in non-faulty areas. FTU is an intelligent terminal device installed in the power distribution room or feeder. It can communicate with the remo...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when a small-current single-phase grounding fault occurs in the system, the fault current is very small and the fault signal is weak, which makes fault detection, line selection, and positioning very difficult. The purpose is to provide FTU based on 10kV distribution network The fault location method solves the problem that when a small current single-phase ground fault occurs in the system, the fault current is very small and the fault signal is weak, which makes fault detection, line selection, and location very difficult

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