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

Active Publication Date: 2016-08-03
西安上普电力工程有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing grounding grid corrosion diagnosis methods all need to rely on the grounding grid drawings

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  • Infinitesimal segmentation and detection method for substation grounding grid corrosion detection
  • Infinitesimal segmentation and detection method for substation grounding grid corrosion detection
  • Infinitesimal segmentation and detection method for substation grounding grid corrosion detection

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Embodiment Construction

[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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Abstract

The invention discloses an infinitesimal segmentation and detection method for substation grounding grid corrosion detection. The method comprises steps: a different frequency excitation source is injected to two adjacent lower guiding bodies; surface magnetic induction intensity is measured, and surface grid magnetic induction intensity distribution data are acquired; the surface grid magnetic induction intensity distribution data are stored to a data table; according to a display result of the data table, whether the detected lower guiding body nodes belong to detectable nodes or undetectable nodes is judged; the surface magnetic induction intensity between the two detectable nodes is measured, and the surface magnetic induction intensity value between the two detectable nodes are acquired; a grounding grid resistance value between the two detectable nodes is calculated according to the surface magnetic induction intensity value, and the calculated grounding grid resistance value is used for judging corrosion happens to the grounding grid line between the two detectable nodes. The infinitesimal segmentation and detection method does not depend on a grounding grid drawing for calculation of a theoretical value or a simulation value, and the detection efficiency and the detection reliability are effectively improved.

Description

technical field [0001] The invention relates to a method for detecting corrosion of a substation grounding grid, in particular to a method for detecting corrosion of a substation grounding grid by micro-element segmentation. Background technique [0002] The grounding grid is an important guarantee for the safe operation of the substation. It is very important to protect the personal safety of the staff in the substation and the normal operation of various electrical equipment. Its grounding performance has always been valued by the production and operation department. The power frequency grounding parameters and design of the grounding grid have attracted the attention of many scholars. For the grounding grid made of steel material, in rainy and coastal areas, with the increase of service life, it is prone to corrosion, which may make the grounding conductor thinner or even break, destroy the original structure of the grounding grid, and reduce the grounding performance of ...

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Application Information

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IPC IPC(8): G01R27/20
CPCG01R27/205
Inventor 魏欣孙玥李立早陈凡
Owner 西安上普电力工程有限公司
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