Progress in oil-filled cables and their accessories

Recent advances in self-contained oil-filled cable system

“…In a review in 1961 1 it was forecast that, provided account were taken of thermomechanical effects, of the nature of the media in which cables are laid and due consideration was given to dielectric ageing, then operating temperatures above 85°C could be safely adopted. Higher design stresses were considered to be essential for the introduction of cables for 400 kV and higher voltages.…”