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The protection of 500kV substation grounding grids with combined conductive coating and cathodic protection

Zhenxing Ren (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)
Daowu Yang (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)
Jun Liu (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)
Yong Ma (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)
Zhongtang Huo (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)
Shaochang Zheng (Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China.)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 2 March 2015

Abstract

Purpose

The purpose of the paper was to design an anti-corrosion system that combined conductive coatings with cathodic protection for a 500-kV substation ground grid, and provide a basis for the anti-corrosion construction of the installation.

Design/methodology/approach

The study took the Shaoguan 500-kV substation grounding grid as the research object. The anti-corrosion performance of KV conductive coatings on grounding metal was researched. In parallel, the alkalinity of substation soil was evaluated according to the German DIN50929 Standard, and the combined protection system comprising conductive coatings and impressed current cathodic protection was designed.

Findings

KV conductive coatings, that have resistance to acids, alkalis and salts, can effectively slow down the corrosion rate of the grounding grid. The investigation also provided the outline design, installation, construction requirements and monitoring methods for the 500-kV substation grounding grid.

Originality/value

This report contains some guiding significance for anti-corrosion engineering of 500-kV substation grounding grids.

Keywords

Acknowledgements

This work was financially supported by the Hunan Provincial Scientific Program of China (No. 2008Gk3063) and the Changsha City Scientific Program of China (No. K1104029-11).

Citation

Ren, Z., Yang, D., Liu, J., Ma, Y., Huo, Z. and Zheng, S. (2015), "The protection of 500kV substation grounding grids with combined conductive coating and cathodic protection", Anti-Corrosion Methods and Materials, Vol. 62 No. 2, pp. 83-87. https://doi.org/10.1108/ACMM-10-2013-1311

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited