Displacement and support of medium voltage conductors by means of loader cranes

摘要

Many live working operations carried out on medium voltage overhead lines require to move and temporary hold conductors by means of triangular assemblies (or "tongs") mounted on poles made of hot sticks, saddles, clamps, and hand-driven blocks and tackles. This work method, used for many years and though effective, does not meet contemporary requirements such as the respect of the Machinery Directive and the imperative of ergonomics. In order to reduce works carried out standing on ladders and load handling, it was thus relevant to adapt the insulated jib of the live working aerial lift on loader cranes that are already widely used to lift transformers during live line maintenance. Besides, this solution could shorten the time of works and make the job less hard, more modern and so more attractive. RTE-SERECT has therefore collaborated with loader cranes manufacturers so as to develop and certify an interchangeable system enabling to fix the insulated jib on multiple cranes. This paper intends to present the technical solution developed and the feedback earned through the first live works that used this new piece of equipment with the participation of loader cranes manufacturers and distribution supply operator ESR.