A kind of substation grounding grid condition evaluation method and computer system

Abstract

The invention relates to a method and a computer system for evaluating the status of a substation grounding grid. The method includes: obtaining electrical performance indicators and non-electrical performance indicators according to the evaluation object; constructing the weight of the electrical performance indicators; based on the electrical performance indicators and corresponding weights of the grounding grid Apply the improved TOPSIS method to conduct a preliminary assessment of the state of the grounding grid, and obtain the preliminary assessment results; obtain the scores of each non-electrical performance index and the evaluation results of the non-electrical performance; obtain the final state evaluation results of the grounding grid, so as to guide the staff to carry out the maintenance of the grounding grid . Compared with the prior art, the present invention can effectively evaluate the state of the substation grounding grid, and provide reference for whether the grounding grid needs to be excavated and maintained; at the same time, because the influence of electrical performance and non-electrical performance on the degradation degree of the grounding grid is comprehensively considered , so that the evaluation results are more comprehensive and accurate, so that effective measures can be taken in time to improve the operation reliability of the power system.

Description

technical field [0001] The invention relates to the technical field of substation grounding grids, in particular to a substation grounding grid state evaluation method and computer system based on the improved TOPSIS method. Background technique [0002] The grounding grid is an important part of the substation and an important measure to maintain the normal operation of the system and ensure the safety of operating personnel and equipment. However, if the grounding grid is buried in the ground, corrosion defects are often caused by poor welding during construction and the electrochemical action of the soil during operation. In the slightest, the grounding grid conductor becomes thinner, and in severe cases, the grounding grid conductor breaks, etc., causing the grounding performance of the grounding grid to decline. , which may cause accidents in severe cases, has increasingly become a major problem to be solved in the power system. At present, the relevant departments of ...

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Problems solved by technology

[0003] Patent applications CN104833898A and CN104678246A respectively propose a method for evaluating the corrosion state of substation grounding grids using M-sequence signal currents and based on impact grounding impedance and response. The content is not comprehensive enough, and the evaluation results are easily affected by noise

Patent application CN107271934A proposes a method for evaluating the safety status of grounding grids based on magnetic effects, but the electromagnetic environment of substations is relatively complex, the magnetic field signals are easily disturbed, and the implementation process is relatively cumbersome

Patent application CN104897875A proposes a method for evaluating the corrosion of substation soil to galvanized steel grounding grids, but the scoring process of this method is completely subjective, and the evaluation results are greatly affected by subjective factors

Patent application CN107561407A proposes a distributed substation grounding grid detection and evaluation method, which is mainly based on grounding grid design drawings to perform inversion calculations to obtain grounding grid characteristic parameters and evaluate the grounding grid status, but the grounding grid soil characteristics are extremely complex and affect Due to many factors, the deviation between the theoretical calculation results and actual results of the grounding grid characteristic parameters can easily affect the accuracy of the evaluation results

It is difficult to accurately obtain the state of the grounding grid in the existing technology, and the staff cannot perform reliable maintenance on the grounding grid

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