A detection method for lack of conductors in substation grounding grid

Abstract

The invention relates to a method for detecting shortage of a grounding grid conductor of a transformer substation. The method for detecting shortage of the grounding grid conductor of the transformer substation includes the following steps that a detected grounding grid topological structure of the transformer substation and the specific resistance of the grounding grid conductor per length unit are obtained at first, nodes of the grounding grid topological structure are coded, a direct current resistor which is directly connected with the grounding grid and a connection lead of equipment of the transformer substation is measured, a direct-current resistance value and node numbers are recorded, a grounding lead is used for directly measuring variation of direct-current resistance and reference direct current resistance of the grounding grid topological structure to obtain variation of resistance of branches of the grounding grid conductor. According to variation conditions of the resistance of the branches of the grounding grid conductor, whether shortage of the grounding grid conductor exists or not is judged. According to the method for detecting shortage of the grounding grid conductor of the transformer substation, shortage of the grounding grid conductor of the transformer substation can be conveniently detected, potential safety risks caused by shortage of the grounding grid conductor can be found in time, a means for inspecting physical integrality of the grounding grid is provided besides electrical parameters when the grounding grid is inspected, a real topological structure will be identical with a construction blueprint after the grounding grid operates and maintaining service is provided for operation of the grounding grid.

Description

technical field [0001] The invention relates to a method for detecting the absence of conductors in a substation grounding grid, in particular to detecting whether there are jerry-built materials in the construction process and conductors missing due to unlaid conductors during the handover and acceptance of a newly-built substation grounding grid, which belongs to the field of electric power detection . Background technique [0002] The grounding grid plays a very important role in the operation of the substation. The grounding grid must not only meet the requirements of power frequency short-circuit short-circuit current, but also meet the requirements of lightning impact, and ensure that the step voltage and contact voltage in the event of a fault are of great importance to operators and Maintenance personnel are not at risk. With the development of the power grid, especially the more and more electronic equipment in the substation, the requirements for the grounding gri...

AI Technical Summary

Problems solved by technology

As for the integrity of the physical topological structure of the grounding grid, there is no mandatory requirement to measure the integrity of the grounding grid at the time of handover and acceptance. Relevant scholars mainly focus on diagnosing the corrosion of the grounding grid after operation, and the results of corrosion diagnosis are also affected by actual conditions. Influenced by the consistency of the ground grid and the drawings, in order to standardize the construction of the ground grid and ensure that the ground grid is consistent with the construction Figure 1 To provide technical support for the operation and maintenance of the ground grid, so it is necessary to find an effective technical means and method to detect the lack of ground grid conductors without excavating the ground grid in a large area

Images