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Cable external-damage-prevention early warning method based source location technology

A technology to prevent external force damage and external force damage, applied in the field of electric power, can solve the problems of limited protection of cable channels, no early warning time, limited coverage area, etc., and achieve the effect of small number of array elements, fast positioning, and small amount of calculation

Inactive Publication Date: 2018-11-16
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, power supply companies usually use manual patrols to check for potential construction hazards. The coverage area is limited and the labor cost is extremely high, and the protection effect on cable channels is limited.
When traditional leakage current detection methods, power line carrier detection methods, and point strain sensor detection methods monitor cable lines, the fault can only be located when the cable is about to be or has been damaged, which does not provide enough early warning time

Method used

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  • Cable external-damage-prevention early warning method based source location technology
  • Cable external-damage-prevention early warning method based source location technology
  • Cable external-damage-prevention early warning method based source location technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Use the geophone to monitor the Rayleigh wave generated by the hammer construction.

[0045] (2) The time delay estimation algorithm based on wavelet transform, considering the characteristic that the wave speed at a specific frequency remains unchanged throughout the propagation process, wavelet transform is used to extract and analyze the collected Rayleigh wave of a single frequency or a narrow frequency segment within the waveform to improve positioning accuracy.

[0046] Perform wavelet transform on the detector signal x(t),

[0047]

[0048] Among them, the mother wavelet ψ(t) chooses the Meyer wavelet with good regularity in both the time domain and the frequency domain, and the parameters a and b are the scaling factor and translation factor of the wavelet mother function respectively;

[0049] In formula (1),

[0050]

[0051] It can be seen from this:

[0052]

[0053] in is the instantaneous output power, N is the number of sampling points; ...

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Abstract

The invention discloses a cable external-damage-prevention early warning method based source location technology. The method comprises the following steps: to begin with, monitoring Rayleigh waves produced by construction of a quartering hammer through a detector; carrying out estimation on the monitored waveform through a delay estimation algorithm based on waveform transform, so that waveforms in a single frequency or narrow frequency band can be extracted and analyzed; and on the basis of delay estimation, carrying out modeling through a geometric positioning algorithm based on a four-element cross array, and calculating the position of a signal source according to the relative position of each detector array and the corresponding time delay value. The method needs smaller detector array elements, is small in calculation amount, can realize quick positioning of the construction source and provide enough early warning time, and can send an early warning signal to relevant departmentsin time to prevent damage to power cables.

Description

technical field [0001] The invention relates to the field of electric power, and more specifically, relates to a method for early warning of cable damage by external force based on source location technology. Background technique [0002] With the development of my country's economy, the pace of urban infrastructure construction is accelerating, and municipal road construction is frequent. However, due to loopholes in the connection between the urban construction department and the operation and maintenance of power cables, the safety hazards caused by municipal engineering construction to underground cables continue to intensify, and power cables are used. Incidents of vandalism occur frequently. According to statistics, external damage is the main cause of power cable failure. At present, power supply companies usually use manual patrols to check for potential construction hazards. The coverage area is limited and the labor cost is extremely high, and the protection effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/16G01S5/22
CPCG08B13/1663G01S5/22
Inventor 鲁军欧安杰潘斌李黔叶慧萍方伟彬李卫东李文虎周丹林旭照杜礼锋容家灏
Owner GUANGDONG POWER GRID CO LTD
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