Failure Analysis of the Strain Clamp Steel Anchor Corrosion of a 500 kV Transmission Line

By macroscopic observation, composition analysis, mechanical properties test, SEM, energy spectrum, overall grip tensile test and finite element mechanics calculation method, the strain clamp steel anchor corrosion failure of a 500 kV transmission line is analysed. The results show that the corrosio...

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Bibliographic Details
Published inE3S Web of Conferences Vol. 252; p. 2032
Main Authors Liu, Weike, Cao, Xianhui, Hu, Yujing, Li, Dong, Xie, Yi
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2021
Subjects
Carbon steels
Corrosion
Corrosion rate
Crevice corrosion
Energy spectra
Failure analysis
Finite element method
Fittings
Galvanic corrosion
Galvanizing
Mechanical properties
Rusting
Steel
Strain
Strain analysis
Stripe rust
Tensile tests
Transmission lines
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Summary:By macroscopic observation, composition analysis, mechanical properties test, SEM, energy spectrum, overall grip tensile test and finite element mechanics calculation method, the strain clamp steel anchor corrosion failure of a 500 kV transmission line is analysed. The results show that the corrosion of steel anchor for 31 years are the result of the natural corrosion, steel anchor corrosion rate is accelerated due to the galvanic corrosion, crevice corrosion, stress and damaged surface of the galvanized layer, and achieve C4 environment (zinc 2.1–4.2 um per year, carbon steel 50–80 um per year). The hardware are qualified. It is suggested to replace the steel anchor with yellow rust on the surface after 5 years, and to reevaluate the next maintenance cycle of the gold fittings without yellow rust on the surface at present, and replace it when the corrosion depth reaches 10%. Before replacement, all fittings should be monitored, especially steel anchor.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202125202032