A method for extracting effective current signal of abnormal discharge of AC transmission line

A technology of abnormal discharge and effective current, which is applied in the direction of effective value measurement, pattern recognition in signal, and test of dielectric strength. Effects of avoiding tripping accidents, improving reliability, and reducing data volume

Active Publication Date: 2021-09-28
武汉华瑞伏安电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manual inspection has the disadvantages of heavy workload, time-consuming and labor-intensive; in recent years, the inspection method of UAV carrying video images has been widely used in the power grid, and has achieved certain application effects, but the method of UAV inspection is mainly It is a regular and fixed-point patrol inspection, that is, patrol inspection is carried out at a designated time and a designated section, and it is impossible to realize wide-area and all-time monitoring of the line

Method used

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  • A method for extracting effective current signal of abnormal discharge of AC transmission line
  • A method for extracting effective current signal of abnormal discharge of AC transmission line
  • A method for extracting effective current signal of abnormal discharge of AC transmission line

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Effect test

Embodiment 1

[0057] like Figure 5 As shown, a method for extracting the effective current signal of the abnormal discharge of the AC transmission line includes the following steps:

[0058] S000. The monitoring terminal collects the waveform on the line body by means of threshold value triggering;

[0059] S001, wave tail trigger waveform removal;

[0060] S002, high-frequency noise removal;

[0061] S003, adding windows;

[0062] S004, window time weight calculation;

[0063] S005, window time interval calculation;

[0064] S006, the data sending server;

[0065] S007. Diagnostic analysis.

Embodiment 2

[0067] like Figure 5 As shown, the present embodiment is a further improvement on the basis of embodiment 1, specifically as follows:

[0068] The monitoring terminal adopts the threshold trigger method to collect the waveform on the line body, specifically:

[0069] The monitoring terminal collects the small current signal on the line body, and judges whether the amplitude of the small current signal exceeds its set threshold, and if so, triggers the monitoring terminal to collect a section of N milliseconds waveform at a sampling rate of S megapoints per second , and the waveform is timed by GPS; if not, the small current signal is discarded;

[0070] Repeat the above steps to collect multiple waveforms and sort them according to GPS time to form a waveform pile.

[0071] In this embodiment, the sampling rate S of the monitoring terminal is preferably 10 MS / s. Of course, it does not exclude the sampling rate S of other values, and this embodiment only uses 10 MS / s as an e...

Embodiment 3

[0076] like figure 2 As shown, the present embodiment is a further improvement on the basis of embodiment 2, specifically as follows:

[0077] Tail Trigger Waveform Removal:

[0078] The waveforms that meet the trigger threshold are sequentially subjected to the wave tail trigger waveform removal algorithm. If the wave tail trigger waveform removal algorithm is satisfied, then enter the next step. If not, the waveform is discarded;

[0079] However, in this embodiment, the implementation logic of the tail-triggered waveform removal algorithm is as follows:

[0080] If the absolute values ​​of all sampling points N / 2 milliseconds before the threshold trigger sampling point are less than or equal to the trigger threshold*1 / 2, then keep the trigger waveform and enter the next step of judgment, otherwise, discard it.

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Abstract

The invention relates to a method for extracting an effective current signal from an abnormal discharge of an AC transmission line, comprising the following steps: S000, a monitoring terminal adopts a threshold triggering method to collect a waveform on a line body; S001, a wave tail trigger waveform is removed; S002, a high-frequency noise is removed ; S003, windowing; S004, window time weight calculation; S005, window time interval calculation; S006, data sending server; S007, diagnosis and analysis. The beneficial effects of the invention are as follows: by extracting and analyzing the discharge current signal generated in the stage of intensified discharge development, it can realize full-time wide-area monitoring and early warning of abnormal discharge state of transmission lines, and avoid tripping accidents caused by some factors; Monitoring with the traveling wave current signal generated by the discharge of the defect in the initial stage can realize the precise positioning of the discharge point, and then achieve the early warning function of the defect and progressive failure.

Description

technical field [0001] The invention relates to the field of power transmission lines, in particular to a method for extracting an effective current signal of an abnormal discharge of an AC transmission line. Background technique [0002] The transmission line runs in the wilderness, and the environment of the line corridor is complex. During the operation of the line, tripping accidents caused by factors such as lightning strikes and external breakages exist objectively. This type of fault occurs from the initial stage of the fault to the relay protection action of the line. Is a short, sudden process, the process can not be predicted. [0003] With the gradual improvement of users' requirements for the reliability of power grid power supply, gradual faults such as insulator pollution, tree barriers, and icing of insulators have attracted widespread attention in the power grid. Such faults need to go through a period from the initial fault stage to the fault trip stage. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/02G01R31/12G06K9/00
CPCG01R19/02G01R31/12G06F2218/04G06F2218/08
Inventor 崔杰谢彬范志升
Owner 武汉华瑞伏安电力科技有限公司
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