Ground net corrosion detection method and system

A corrosion detection and grounding grid technology, which is applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of corrosion current density error, difficulty in accurately measuring the metal corrosion state of the ground grid, submersion, etc.

Active Publication Date: 2008-12-03
NORTH CHINA ELECTRICAL POWER RES INST +1
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Problems solved by technology

[0009] (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 a large error in the calculation of corrosion current density, figure 2 It

Method used

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  • Ground net corrosion detection method and system
  • Ground net corrosion detection method and system

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Embodiment

[0036] Such as Figure 8 , 9 As shown, this embodiment provides a grounding grid corrosion state detection system with an electrochemical sensor, wherein the electrochemical sensor is called a small hole current limiting corrosion electrochemical sensor, referred to as a small hole current limiting sensor.

[0037] 1. Small hole current limiting sensors include:

[0038] 1) As a jacket for the tapered front end (common carbon steel);

[0039] 2) insulating layer 501 (polytetrafluoro tape);

[0040] 3) M2.5 screw holes (514, 515) located on the jacket, and equipped with corresponding screws and fixed plastic tubes so as to be detachably connected to the insulating cylindrical shell body 504 (threaded connection is also available);

[0041] 4) A polyvinyl chloride pipe with a diameter of 15 mm as an insulating cylindrical shell;

[0042] 5) Auxiliary electrode (1Cr13SS);

[0043] 6) Reference electrode (Cu / CuSO4);

[0044] 7) As the screw hole of the auxiliary electrode te...

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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

technical field [0001] 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 [0002] 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. . [0003] Usually, the corrosion of the grounding grid reduces the cross-section of the grounding conductor, and even disconnects in severe cases, which l...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01N17/02
Inventor 张秀丽巩学海宋诗哲王天君李永立王应高莫逆
Owner NORTH CHINA ELECTRICAL POWER RES INST
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