Ground net corrosion detection method and system

Abstract

The invention provides a corrosion detection method for a grounding net, as well as a system. The method comprises the steps as follows: the corrosion potential of detected grounding net metal is measured, constant current step signals are applied to the detected grounding net metal, and the constant current step response signals are collected; the wavelet filter treatment is performed to the collected grounding net soil corrosion electrochemical detection data; and the corrosion electrochemical parameter analysis processing is performed to the grounding net soil corrosion electrochemical detection data after the wavelet filter treatment, thereby generating the grounding net soil corrosion detection result. The grounding net corrosion status is detected accurately and conveniently by the electrochemical detection method.

Description

A grounding grid corrosion detection method and system technical field The present invention relates to the detection technology of the corrosion state of the grounding grid of 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 of the grounding grid. Background technique The grounding grid of power plants and substations is an important facility to ensure the safe and reliable operation of power systems. Since the grounding grid is usually laid under the ground greater than 0.6 meters, it is invisible and has no monitoring device. Therefore, after the grounding grid is put into operation, how to effectively detect the corrosion of the grounding grid without excavation is an urgent problem to be solved. . Usually, the corrosion of the grounding grid reduces the cross-section of the grounding conductor, and even dis...

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Problems solved by technology

(1) The current limiting problem of the corrosion electrochemical measurement sensor: the traditional electrochemical three-electrode measurement system is difficult to accurately measure the corrosion state of the ground grid metal, because a certain section of the ground grid metal to be measured is not an independent electrode. The entire ground grid metal is connected together, so the polarization current applied to the ground grid metal through the auxiliary electrode will not be limited to the measured ground grid metal, and the area of ​​the polarized ground grid metal is uncertain will introduce large errors in the calculation of corrosion current density. Figure 2 is a schematic diagram of the measurement principle of the traditional electrochemical three-electrode measurement system

(2) The interference of the measurement environment of power plants, substations and transmission lines on the measurement system: there are many and strong interference signals in power plants, substations and transmission lines in the test environment, and the stray currents in the soil have a great impact on the electrochemical testing technology. The response signal has strong interference, and sometimes even completely submerges the real signal, and the signal-to-noise ratio of the response signal obtained is very low, making data analysis impossible

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