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Method and system for detecting corrosion state of grounding grid

A technology of corrosion state and detection method, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc.

Active Publication Date: 2013-12-11
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the constant current transient response curve is composed of a large number of data points. For a system with a small time constant, it will reach a steady state in a short period of time. It is difficult to obtain a result that reflects the real situation with the fitting method

Method used

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  • Method and system for detecting corrosion state of grounding grid
  • Method and system for detecting corrosion state of grounding grid
  • Method and system for detecting corrosion state of grounding grid

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Embodiment

[0090] This embodiment of the invention is realized by a three-electrode sensor and a portable computer, such as Figure 4 Shown is a schematic diagram of an embodiment of the present invention.

[0091] The grounding grid detection model based on wavelet and Kohonen neural network set up in the notebook computer 302, the model selects a multi-layer structure and consists of three parts. The first part performs wavelet extraction on the collected signal. Let the number of layers be five layers, that is, the wavelet extraction model is composed of five layers, corresponding to the five-layer decomposition of multi-resolution analysis, the number of nodes is related to the selected wavelet base, and there is Weight connections, the corresponding weights are fixed, so the weights between these points are fixed and do not have a learning function, but it can eliminate the redundancy of information, reduce the dimensionality of information without distortion.

[0092] The second p...

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Abstract

The invention provides a method and system for detecting a corrosion state of a grounding grid. The method for detecting the corrosion state of the grounding grid comprises the steps that three-electrode system sensor is adopted to apply step currents to the detected grounding grid, and the step response signals of the detected grounding grid are collected; wavelet signal extraction is carried out on the step response signals to generate detection signals; reconstruction is carried out on the detection signals to generate smoothing response signals; whether the collected step response signals are effective or not is judged according to the reconstructed smoothing response signals; the step response signals are determined to be effective, and the neural network weight of the detected grounding grid is generated according to the detection signals and a Kohonen neural network model; the detection result of the corrosion state of the grounding grid is generated according to the neural network weight of the detected grounding grid and a pre-stored standard neural network weight. Fitting does not need to be carried out on obtained on-site detection electrochemical signals, a judgment result is directly obtained, and the method and system are suitable for a tester without checkout knowledge as well.

Description

technical field [0001] The present invention relates to the detection technology of the corrosion state of the grounding grid in power plants and substations, in particular to the detection technology of the corrosion state of the grounding grid using electrochemical detection, specifically a method and system for detecting the corrosion state of the grounding grid. Background technique [0002] Carbon steel is generally used as the material of the grounding grid in my country. Since the grounding grid is buried underground all year round, it is prone to corrosion, resulting in deterioration of its electrical performance. In serious cases, it directly endangers the stable operation of the power grid. Corrosion state detection without excavation is of great significance to ensure the reliable operation of the power system in order to detect faults in time and prevent problems before they happen. [0003] In the prior art, the power plant and substation grounding grid measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01N17/02
Inventor 张秀丽高志明王应高李永立王娜马茜
Owner STATE GRID CORP OF CHINA
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