Study of Corrosion Resistance Improvement by Metallic Coating for Overhead Transmission Line Conductor

Abstract

Applying anti-corrosion grease and aluminum clad steel (AC) wires to ACSR has adopted as general methods to prevent overhead transmission line conductors and/or wires from corrosion. However, there are some cases that ineffectiveness of those means are reported on some transmission lines passing through acid atmosphere in the vicinity of a factory exhausting acid smoke. The feature of the corrosion caused by acid atmosphere is to show a higher speed in its progressing as well known.As means against such acid corrosion, application of high purity aluminum, selective removal of inter-metallic compound in aluminum and plastic coating wires has been reported before, and each has both of advantage and disadvantage actually. In the former letter, we reported the new type of anti-corrosion grease that shows an excellent property against acid atmosphere as well as in a salty circumstance.Here presents a new type of anti-corrosion technology of applying high corrosion resistance aluminum alloy or zinc coatings on each component wires of a conductor that we succeed in developing through a serial study of anti-corrosion methods on overhead transmission lines.

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“…As is known to all, transmission line is the preliminary main facility for power delivery and is mainly composed of twisted aluminum lines. During the long‐term outer door field service, overhead transmission lines may be damaged by lightning strike, corrosion of chemical contaminants, ice shedding, wind vibration of conductors, lines galloping, damage due to external forces and so forth . It will induce some fatal accidents such as broken transmission lines which decreases power quality and delivery capacity obviously if the latent faults can not be recognized and restored as early as possible.…”