| The good performance of the grounding grid is an important guarantee for the safe and stable operation of the power system,but after years of operation in the humid and complex soil environment,the grounding conductor will inevitably be corroded,which makes the performance of the grounding grid decline and the reliability of power supply can not be guaranteed,while the traditional diagnosis method is time-consuming and too blind.In order to realize the convenient and accurate corrosion diagnosis of the grounding grid under the premise of no power cut and small area excavation,this paper proposes an Improved Grey Wolf Optimizer(IGWO)and applies it to the corrosion model established based on the electric network analysis method.Through the experimental grounding grid of 60 branches established on atpdraw and the grounding grid model of a 110 k V Substation in Chongqing,the node electricity is calculated Then input it into the igwo based corrosion diagnosis program written on MATLAB to find out the location and severity of corrosion.For the single branch corrosion of 60 Branch experimental grounding grids,the diagnostic program can diagnose it once and accurately.For 60 branches of experimental grounding grid and a 110 k V substation grounding grid in Chongqing,the reachable nodes are selected near the suspected corrosion branches to measure and diagnose again.The error between the diagnosis results and the preset conditions is within the acceptable range,which verifies the effectiveness of the proposed method.In addition,taking the actual 110 k V substation grounding grid as the research object,the paper systematically discusses and analyzes the specific influence of the grounding down lead offset and the grounding conductor in the cable trench on the diagnosis results,and based on this,puts forward corresponding suggestions for the actual diagnosis work in order to reduce the impact of these factors and improve the accuracy of the diagnosis results. |
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