Super-tension cable development

Summary The limitations of the solid-type oil-impregnated paper-insulated cable for the transmission of super-tension voltages is discussed and the pattern of development of the various designs of special cable which are available is described. These designs fall into two main groups. The first group contains those designs which use a fully-impregnated dielectric and the second group those which contain gas under pressure in the dielectric. The merits of the alternative systems are discussed in relation to existing type testing specifications and to future developments for cable materials. The conclusion reached is that the fully-impregnated dielectric offers the greatest potentialities for the future development. The pipe-line compression cable and the flat oil-filled pressure cable systems are described briefly, reference also being made to the design modifications which are possible with the two systems.