Fault waveform starting point judgment method and device, computer device and medium

Abstract

The invention relates to a fault waveform starting point judgment method. The method comprises the steps of continuously obtaining current information of a power distribution network; intercepting a fault waveform in the current information; eliminating the noise of the fault waveform to obtain noise elimination waveform data; calculating to obtain an extreme point of the noise elimination waveform data; and searching and judging a waveform starting point of the noise elimination waveform data according to the sequence decreasing direction based on the extreme point, wherein the waveform starting point of the noise elimination waveform data is the waveform starting point of the fault waveform. When the power distribution network has a grounding or short-circuit fault, a transient process exists; compared with a traditional fault starting point judgment method for slope break variables, the method has the advantages that the searching efficiency and accuracy of the starting point can beimproved after the noise influence is effectively eliminated, the noise influence can be effectively eliminated, and the starting moment of a fault can be accurately judged.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a method, device, computer equipment and medium for judging the starting point of a fault waveform. Background technique [0002] The fault indicator is a device installed on power supply equipment such as overhead lines, cables, and busbars to indicate the fault current path. It is currently mainly used in 10KV overhead distribution networks in suburban, rural, and mountainous areas. The fault indicator detects the current and voltage of the line, and sends a warning message based on the judgment after the line fails, helping the staff to quickly determine the fault line and the specific section of the distribution network, shorten the time required to find the fault point, and reduce the loss caused by the power outage . [0003] At present, the wave-recording type fault indicator is widely used: this kind of fault indicator can record the current state of the line, and up...

AI Technical Summary

Problems solved by technology

According to the current on-site constraints such as the zero-sequence signal acquisition of the fault indicator, communication channels, and the current national hardware sampling accuracy requirements, it is impossible to guarantee the zero value of the zero-sequence current before the fault, or even produce a small mutation

The traditional method of judging the fault starting point based on the sudden change in slope may have relatively large limitations, and it is easy to misjudge "noise" as a fault

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