A Method for Measuring Grounding Resistance of Grounding Grid

Abstract

The invention discloses a method for measuring the grounding resistance of a grounding grid, which belongs to a method for measuring the grounding resistance of a grounding grid in a power plant and a substation. Geological survey soil resistivity or water conductivity to prepare model conductive medium; according to the electric field geometric simulation theory of Laplace equation, the length of the grounding grid can be enlarged in equal proportions at the beginning of the design of the repower plant or distribution station project Or shrink, provide improvement measures for the design of the grounding grid, predict the grounding resistance after the grounding grid is installed, and optimize the design when the performance of the grounding resistance is met, further reduce the project cost risk, and the measurement cost is disclosed, which realizes The technology of measuring the grounding resistance of the grounding network is economical, and the invention can be directly applied to various electric places, and has a wide range of applications.

Description

technical field [0001] The invention relates to a method for measuring the grounding resistance of a grounding grid, in particular to a method for measuring the grounding resistance of a grounding grid. Background technique [0002] The grounding resistance measurement method of the grounding grid of the power plant or substation in the prior art generally adopts the measurement after the installation and construction of the grounding grid is completed on site. This measurement method has no predictability for the grounding resistance value of the grounding grid There is also blindness in the improvement of the follow-up grounding grid. For example, the publication number of the invention patent application is CN101900764A, and the name of the invention is the method of measuring the grounding resistance of the grounding grid using the short-distance measurement method. It is stated in the background technology that most power departments use the grounding resistance measurem...

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Problems solved by technology

[0002] The grounding resistance measurement method of the grounding grid of the power plant or substation in the prior art generally adopts the measurement after the installation and construction of the grounding grid is completed on site. This measurement method has no predictability for the grounding resistance value of the grounding grid There is also blindness in the improvement of the follow-up grounding grid. For example, the publication number of the invention patent application is CN101900764A, and the name of the invention is the method of measuring the grounding resistance of the grounding grid using the short-distance measurement method. It is stated in the background technology that most power departments use the grounding resistance measurement method And the length of the current electrode lead is required to be 4-5 times the length of the substation. For example, for the grounding grid of a large hydropower station with a length of nearly 10km, if it does not meet the requirements after measurement, it needs to be rectified, and the extensive use of grounding leads increases the overall cost of the project.

On the other hand, in the preliminary design of the grounding grid, some grounding grid simulation software will also be used for numerical calculation and analysis. This type of software is based on the analysis and calculation of the electromagnetic field theory. The electrical conductivity and so on are all virtual theoretical states. Since the grounding grids of power plants and substations usually have a complex environment and many accidents, software simulation can only perform simple and idealized layering, but cannot accurately reflect the grounding resistance of the grounding grid. In practice, the calculated results can only be used as theoretical reference

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