Method for Calculating the Galvanic Corrosion Rate of Copper-steel Connected Ground Grids

During the reconstruction or expansion of power plants and substations, copper and steel ground grids are often connected, and the resulting galvanic corrosion shortens the service life of steel ground grids. However, no method is yet available for calculating the galvanic corrosion rate of the enti...

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Bibliographic Details
Published inIEEE transactions on power delivery Vol. 39; no. 1; pp. 1 - 10
Main Authors Lu, Hailiang, Li, Yuanjie, Li, Zhizhong, Li, Wei, Wang, Huiwu, Bian, Chao, Tan, Bo, Wen, Xishan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Conductors
Copper
Corrosion
corrosion life
Corrosion rate
Dissimilar metals
Electric potential
Electrical grounding
Electrodes
Galvanic corrosion
galvanic corrosion rate
ground grid
linearization
Mathematical analysis
Method of moments
Power generation
Power plants
Service life
Steel
Steel structures
Substations
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Summary:During the reconstruction or expansion of power plants and substations, copper and steel ground grids are often connected, and the resulting galvanic corrosion shortens the service life of steel ground grids. However, no method is yet available for calculating the galvanic corrosion rate of the entire ground grid. On the basis of electrochemical theory, method of moments, and Taylor's formula, a method is proposed for calculating the galvanic corrosion rate of connected ground grids composed of dissimilar metals, and the effectiveness of this method is verified through galvanic corrosion experiments and FEM. For an actual project in which copper and steel ground grids are connected, the galvanic corrosion rate distribution of ground grids is calculated and analysed. According to the results, galvanic corrosion can significantly reduce the service life of ground grids, and in this engineering case, the remaining service life of the steel ground grid is reduced from 17.4 to 9.7 years (a decrease of 44.3%). The galvanic corrosion rates at the edges and corners of steel ground grid are considerably higher than those in its interior, and the galvanic corrosion rate of the steel ground electrodes is highest near the copper ground grid.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2023.3332362