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

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.

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