A New Corona-and Heat-Resistant Cable Insulation Based on Etkylene Propylene Rubber

After a review of water-resistant insulations now in use for power cables, the properties of a new corona and heat-resistant rubber-like water-resistant cable insulation based on ethylene-propylene rubber (EPR) are compared with those of butyl-base rubber and cross-linked (vulcanized) polyethylene. It is concluded that the new insulation has a more attractive combination of properties than either butyl or cross-linked polyethylene and that it could be operated continuously at 90 C up to 28,000 volts in either wet or dry locations.