Aluminum, a main conductive material for overhead transmission lines, has excellent resistive property against corrosion in normal environment as far as its stable skin is not broken. However there are so many lines going through coastal and/or industrial areas where corrosive particles tend to occur. Under such circumstances the conductors filled with the grease among those wire layers have been generally adopted as an anti-corrosion measure. But corrosive circumstances have been getting severer to overhead lines in the last decades and there might be some cases in future that even the conventional measure does not enable to acquire sufficient effect against corrosion. Therefore, improvement of corrosion resistance of a conductor must be one of the most significant themes in order to obtain the higher reliability of overhead transmission lines at this stage.We successfully developed a new anti-corrosion overhead line conductor realizing much effectiveness against the acid atmosphere and/or rain as well as salty circumstances in the coastal area.

SUMMARYApplying anticorrosion grease and aluminum-clad steel (AC) wires to ACSR have been adopted as general methods to protect overhead transmission line conductors and/or wires from corrosion. However, in some cases those means have been found to be ineffective on some transmission lines passing through acid atmosphere in the vicinity of a factory exhausting acid smoke. The corrosion caused by acid atmosphere is characterized by a higher speed in its progress as is well known.As means against such acid corrosion, application of high-purity aluminum, selective removal of intermetallic compound in aluminum, and plastic coating wires have been reported before, and each has both advantages and disadvantages. In a former report, we found that a new type of anticorrosion grease shows an excellent property against acid atmosphere as well as in a salty condition.Here we present a new type of anticorrosion technology of applying high-corrosion-resistance aluminum alloy or zinc coatings on each component wire of a conductor that we succeeded in developing through a serial study of anticorrosion methods on overhead transmission lines.

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.