Limiting dry band arcing on an all-dielectric self-supporting cable; arc gap devices

摘要

To limit dry band arcing adjacent an earthed suspension region 20 of an all-dielectric self-supporting (ADSS) cable 10 suspended at the region 20 from a tower which also supports power transmission lines, a current path incorporating an arc gap, or equivalent solid state device such as a varistor, is provided between electrically conductive clamps 28, 26 disposed around the cable 10 at the earthed suspension region 20 and at a location 22 remote from region 20, respectively. An arc gap may be defined between a tubular sleeve 32 connected to and adjacent the clamp 26 (or 28) and a rod 30 connected to clamp 28 (or 26) and extending through the sleeve 32. Insulating arms 34 position the rod 30 on the axis of the sleeve 32 to define an arc gap therebetween. Such an arc gap device defined by a sleeve 32, rod 30 and insulators 34 may also be used instead of arcing horns in covered conductors, transformers or any other application which traditionally uses arcing horns.