Infinitesimal segmentation and detection method for substation grounding grid corrosion detection
A substation grounding grid and corrosion detection technology, which is applied in the direction of grounding resistance measurement, measuring devices, and measuring electrical variables, can solve problems such as the inability to guarantee the authenticity and validity of the calculation model, corrosion of the grounding grid, and unreliable measurement results, etc., to achieve Achieve local fault diagnosis, reduce sensitivity, improve detection efficiency and detection reliability
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[0030] In order to facilitate the understanding of the present invention, the principle of micro-element segmentation and detection using the spatial magnetic field is firstly described in the present invention. The principle of the method is as follows:
[0031] (1) Space magnetic field detection
[0032] According to the national standard "Code for Grounding Design of AC Electrical Installations" (GB50065-2011), the substation grounding grid is laid at a depth of 0.8 meters and arranged in a grid at a distance of 10 to 15 meters. Therefore, each ground grid can be regarded as a rectangular coil. If different frequency excitation sources are injected into the rectangular coil, the calculation method for the distribution of the magnetic field intensity generated on the surface is as follows: figure 1 shown. figure 1 The length of the long side of the medium rectangular coil is A, the length of the short side is B, the lengths of the four sides are L1, L2, L3, and L4 respectiv...
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