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

A waveform and fault technology, applied in the field of distribution network, can solve the problem of inability to guarantee the zero value of zero sequence current, small mutation, etc., to improve the efficiency and accuracy of search, and eliminate the effect of noise.

Inactive Publication Date: 2020-12-29
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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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 t

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

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[0053]In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiment of the invention is shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0054]Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more related listed items.

[0055]In t...

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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...

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 肖铭杰丁志明
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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