A non-contact measuring device and method for geomagnetic induction current GIC of buried pipeline

Abstract

The invention relates to a non-contact type measuring device and a non-contact type measuring method for the geomagnetic induction current (GIC) of a buried pipeline. The non-contact type measuring device for the geomagnetic induction current (GIC) of the buried pipeline comprises a composite flux gate probe, a power supply module, a signal conditioning module, a microprocessor, a storage module,a local communication module and a remote communication module. For the characteristics of the geomagnetic induction current (GIC) of a helix weld-seam pipeline, a measuring device is adopted to collect and calculate the magnetic induction intensity generated by the helix current in the helix weld-seam pipeline. In this way, the accurate measurement of the geomagnetic induction current GIC of thehelix weld-seam pipeline is realized. The invention aims at overcoming the defects existing in the prior art, and provides a current model and a GIC measuring method for the helix weld-seam pipeline.Based on the method, according to the manufacturing process of the helix weld-seam pipeline, the current flowing in the pipeline is modeled in a helix track, and the accuracy of the obtained model isimproved. The GIC obtained through measurement is closer to the actual current value, and the magnitude of the GIC in the pipeline can be reflected more truly.

Description

technical field [0001] The invention relates to the technical field of natural disaster prevention for buried pipelines, in particular to a non-contact measuring device and method for geomagnetic induction current GIC of buried pipelines. Background technique [0002] According to the law of electromagnetic induction, when a magnetic storm occurs, an induced current is generated in the distributed closed conductor loop formed by the buried metal pipeline, its coating and the earth, that is, the geomagnetic induced current (GIC). Because GIC is harmful to pipelines, it interferes with the measurement of pipe-ground potential (PSP), makes the cathodic protection (CP) device out of control or even counteracts, causing pipeline corrosion to intensify, thereby reducing the service life of pipelines, etc. Therefore, since GIC was found in pipelines in 1873 , GIC's impact on pipelines and protection issues have always attracted much attention. So far, GIC has been found in pipelin...

AI Technical Summary

Problems solved by technology

Aiming at the problem of large error in measuring the geomagnetic induction current GIC of the spiral welded pipeline in the prior art, the present invention provides a non-contact measuring device for the geomagnetic induced current GIC of the buried pipeline, and provides the current model of the spiral welded pipeline and its GIC measurement method, according to the manufacturing process of the spiral welded pipeline, the current flowing in the pipeline is modeled as a spiral trajectory, which improves the accuracy of the model and makes the measured GIC closer to the actual current value , more realistically reflect the size of the GIC in the pipeline

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