Method and system for determining grounding grid corrosion point

A determination method and technology of grounding grid, applied in the field of power grid, can solve problems such as large workload and blindness, and achieve the effect of ensuring normal operation, avoiding labor and blindness of work

Active Publication Date: 2013-07-10
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] The invention provides a method and system for determining the corrosion point of the grounding grid to solve the problems of large blindness and heavy workload when using the prior art to determine the corrosion point in the grounding grid

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  • Method and system for determining grounding grid corrosion point
  • Method and system for determining grounding grid corrosion point
  • Method and system for determining grounding grid corrosion point

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Embodiment Construction

[0044] The so-called grounding grid refers to a general term for grounding bodies buried in the ground at a certain depth and connected to each other into a grid by conductors. Due to soil corrosion, man-made and other factors, some points in the grounding grid will be corroded. When a grounding fault occurs in the system, it may cause the accident to expand and endanger equipment and personal safety. Area excavation is used to detect the corrosion of the grounding grid, but this method is not accurate, blind, and has a huge workload, which will affect the normal operation of the power system.

[0045] In order to solve the above problems, the core idea of ​​the present invention is that after the alternating current is injected into the grounding grid, there is an axial alternating current distribution in each conductor in the grounding grid. According to the Biosavart quantification, the axial current on the conductor induces a magnetic field perpendicular to the direction o...

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Abstract

The invention discloses a method and a system for determining a grounding grid corrosion point. The method is applied to the system, and includes the steps that alternating currents with certain frequency and a certain size are injected to a grounding grid, alternating magnetic field strength of a detected point in the grounding grid is detected, and normalization response factors of the detected point are calculated; and when the normalization response factors accord with a preparatory condition, the detected point is determined to be a corrosion breakpoint. Through the method, the fact whether a corrosion point exists in the grounding grid or not can be determined, as long as the alternating currents with the certain frequency and the certain size are injected to the grounding grid, normalization processing is carried out on the alternating magnetic field strength of the detected point, and thus the normalization response factors are obtained. When the normalization response factors accord with the preparatory condition, the detected point is determined to be the corrosion point. According to the method, excavation of the grounding grid in a large area is needless, a great quantity of labor and working blindness are avoided, and normal operation of an electric system can also be guaranteed.

Description

technical field [0001] The invention relates to the field of power grids, in particular to a method and system for determining corrosion points of a grounding grid. Background technique [0002] The so-called grounding grid refers to the general term for grounding bodies buried in the ground at a certain depth and connected to each other into a grid shape by conductors. It is widely used in electric power, construction, computer, industrial and mining enterprises, communications and many other industries, and plays the role of safety protection and shielding. There are large and small grounding grids, some are very complex and large, and some are composed of only one grounding electrode, which is designed according to needs. [0003] Connecting to the power grid is very important to the normal operation of the power grid, but soil corrosion, man-made and other factors will cause corrosion at some points in the grounding grid. When a grounding fault occurs in the system, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 侯兴哲张淮清王秀娟吴高林王谦张良胜鲍明晖张海兵黄胜鑫付志红
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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