Electrical stresses in high voltage cable splice

To insure good dielectric performance of a high voltage cable splice, electrical stresses at key locations need to be controlled and kept at a level where corona discharges will not occur during normal operation. The cable -splice interface, in general, is the weakest dielectric path. Where a multipiece concept is used, the interface between cable adapter and splice housing is also a potentially weak dielectric path. Irregular mating surfaces, dirt and other impurities on mating surfaces, improper cable preparation, air entrapment and insufficient interference between cable and splice are some of the factors which severely reduce the dielectric strength of the interface.