Low-current grounding fault positioning method and system, monitoring device, equipment and medium

Abstract

The invention relates to a low-current grounding fault positioning method and system, a monitoring device, equipment and a medium. The method comprises steps of detecting zero-sequence current abruptchange energy by monitoring points along the line and carrying out starting quickly; recording fault waveforms, AND then, according to opposite characteristics of upstream and downstream transient zero-sequence current mutation directions of a fault point, calculating whether the slope of the previous sampling point of the first extreme point of the zero-sequence current in the low-frequency bandcontaining the power frequency is positive or negative; correspondingly fitting a maximum value point curve or a minimum value point curve in an original signal by adopting cubic spline interpolation;and finally calculating a break variable characteristic value, and carrying out fault positioning according to the break variable characteristic value. The storage medium is a computer readable storage medium, and a computer program used for achieving the reset control method is stored on the storage medium. The equipment includes a processor and a memory storing the computer program, and is capable of implementing the reset control method. According to the invention, rapid fault positioning can be carried out when a small-current grounding system has a single-phase grounding fault.

Description

technical field

[0001] The invention relates to the technical field of distribution network, in particular to a small current grounding fault location method and system, a monitoring device, computer equipment, and a computer-readable storage medium. Background technique

[0002] The neutral point of the 10kV and below medium and low voltage distribution network in my country is widely operated without grounding or grounding through the arc suppression coil. On the one hand, when a single-phase (small current) grounding fault occurs, the fault signal is weak and difficult to detect, while single-phase grounding Due to the high frequency of faults, numerous distribution network branches, and random load distribution, the location of small current ground faults has become a major technical problem in distribution network fault handling; , the remote transmission and storage of a large amount of wave recording data have high requirements on the master station and distributed term...

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