Impedance frequency response method for measuring corrosion state of grounding network of transformer substation

Abstract

The invention relates to an impedance frequency response method for measuring the corrosion state of a grounding network of a transformer substation. The method comprises the following steps of: 1, calculating impedance frequency response curves between grounding down leads at different positions and under different corrosion states of the grounding network of the transformer substation by numerical simulation and a corresponding frequency point impedance numerical list; 2, actually measuring and drawing the impedance frequency response curves at the different positions of the grounding network; 3, querying the impedance frequency response curve which is at the same position of the grounding network of the transformer substation and is measured every year; and 4, comparing original input data which are obtained in the step 1, the impedance frequency response curves which are at the different positions and are obtained in the step 2, and the impedance frequency response curve which is at the same position, is measured every year and is obtained in the step 3, estimating the corrosion states of the grounding network, and giving the corrosion level of the grounding network and the equivalent diameter of a grounding body. The method has the advantages that: excavation and soil sampling of the grounding network are not required; the working load of corrosion measurement of the grounding network of the transformer substation is reduced; the cycle of the corrosion measurement of the grounding network of the transformer substation is shortened; and the judgment accuracy of the corrosion level of the grounding network of the transformer substation is improved.

Description

technical field [0001] The invention relates to a method for measuring the corrosion state of a grounding grid, in particular to a method for measuring the impedance frequency response of the corrosion state of a substation grounding grid. Background technique [0002] The substation grounding grid is a metal grid buried in the ground and in close contact with the ground. It undertakes the task of providing a ground channel for the rapid discharge of fault current or lightning current, and protecting personal safety and electrical equipment safety. Due to the corrosion of the grounding grid, problems such as smaller cross-section of the grounding conductor, poor contact, shortened life of the grounding grid, early renovation of the grounding grid, and blind material selection exist in various places in various places. At present, the evaluation of the corrosion status of the grounding grid is getting more and more attention. [0003] In the past, the corrosion assessment of ...

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Problems solved by technology

[0004] The corrosion state of the grounding grid cannot be accurately judged based on the grounding resistance value of the substation grounding grid, and the analysis of the soil corrosion at the buried depth of the grounding grid has disadvantages such as heavy soil sampling workload and long laboratory test and analysis period.

[0005] Large-scale excavation of the grounding grid is likely to be blind, the workload is huge, and problems such as power outages are required. At the same time, there are certain safety hazards. Therefore, a new type of substation grounding grid that is safe, reliable, operable, fast and accurate is studied. Corrosion state measurement method is very urgent

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