Extremely low potential equipotential line drawing system and method based on double reference electrodes

Abstract

The invention relates to the technical field of nuclear power plant buried pipeline maintenance, and particularly discloses an extremely low potential equipotential line drawing system and method based on double reference electrodes, the system comprises a first portable copper sulfate reference electrode, a range finder, a potential acquisition recorder and a second portable copper sulfate reference electrode. The first portable copper sulfate reference electrode is sequentially connected with the range finder, the potential acquisition recorder and the second portable copper sulfate reference electrode, and the potential acquisition recorder is used for measuring the potential difference between the first portable copper sulfate reference electrode and the second portable copper sulfate reference electrode. The range finder is used for measuring the distance between the first portable copper sulfate reference electrode and the second portable copper sulfate reference electrode. By using the system, under the condition that the buried pipeline is not excavated, the extremely-low potential equipotential line of the defects of the anticorrosive coating of the buried pipeline is drawn, and the system is rapid and convenient to operate, ingenious in structural design, reliable in function and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of maintenance of buried pipelines in nuclear power plants, and in particular relates to a system and method for drawing extremely low potential equipotential lines based on double reference electrodes. Background technique [0002] The buried steel pipeline of the nuclear power plant is buried underground, and the outer wall of the pipeline is coated with an anti-corrosion layer to slow down its soil corrosion. With the increase of the service life of buried pipelines, its anticorrosion layer will inevitably degrade; in addition, during the construction or maintenance of buried pipelines, there will inevitably be mechanical damage or poor quality control of backfill (the backfill contains stones ) lead to the destruction of the anti-corrosion layer, resulting in defects in the anti-corrosion layer. The defective parts of the anti-corrosion layer are preferentially affected by various erosive ions (chloride...

AI Technical Summary

Problems solved by technology

[0003] At present, technologies such as DC potential gradient detection (DCVG), AC potential gradient detection (ACVG) and PEARSON are generally used to locate the defects of the anti-corrosion coating of buried pipelines in nuclear power plants. However, the ability of these detection methods to resist stray current interference It is not strong, and it cannot realize the quantitative detection of the defect size of the buried pipeline anticorrosion layer, and cannot guide the priority level of excavation and repair of the buried pipeline anticorrosion layer, which brings difficulties and risks to the aging management of buried pipelines in nuclear power plants

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