All Dielectric Self Supporting Cable with Low Conductive Components

摘要

ADSS cables installed in overhead power lines have been in use for many years and have successfully proven their reliability in many regions on the globe. However, severe damage can occur when these cables are installed in a high electrical field gradient combined with a high level of pollution which can lead to a highly conductive surface with currents up to several milliamperes. When parts of the cable surface dry up, arcing can occur. These sparks deteriorate the polymeric cable sheath. Many attempts have been carried out to improve the resistance against "dry-band arcing". The introduction of tracking resistant sheath materials has improved the cable performance. A further step was the introduction of an additional conductive path below the cable sheath. The aramid yarns were made slightly conductive by impregnating them with a "semi-conductive gel". Cable tests performed in a specially designed lifetime test chamber demonstrated that the cable lifetime was extended by up to a factor of 10 by applying slightly-conductive surfactants directly on the aramid yarns during the manufacturing process of the yams.