ES257875A1 - Improvements in or relating to flexible joints for electric cables - Google Patents

Abstract

A procedure for the elaboration of flexible splices for electric cables to fluid oil, essentially characterized by the fact that on the two pieces of cable to be spliced the lead cladding is cut at a certain distance from the end, so that the insulating coating protrudes a certain length from the lead; the lead, in correspondence with the cut, is widened separating it and in the resulting gap with respect to the insulator, a sealing ring is inserted, made of elastic material, after the lead coating is flattened in the separated area in order to imprison said ring to ensure oil tightness; A short distance from the sealing ring application area, annular grooves are formed externally to the lead in which a trim ring is mounted; On one of the two pieces of cable thus arranged, a lead box provided with connectors is placed to cover the finished patch, after which the connection duct of the cable duct is applied by crushing, so that its diameter is equal to the diameter of the conductor of said cable, the insulation of the two pieces of cable is staggered and the reconstruction of the insulation is carried out step by step with impregnated paper tapes so that the thickness of such insulation is slightly greater in the central area with respect to the thickness of the cable insulation and gradually decrease until the diameter of the cable insulation is reached at the extremities; On said insulator, thus reconstructed, carbon paper and metallized paper are applied as the insulator screen; then, to make the diameter uniform throughout the entire ply, an impregnated insulating paper tape is wound over the metallized paper; Rather thick paper tapes are wound over this filling, in a crisscross direction, to protect the shielding during the reduction in the diameter of the box; then the box is fixed on the joint formed, the extremities are struck, bringing them against the lead of the cable, and a tin solder is made there; The evacuation and impregnation of the site is then carried out, after temporary application, on the outside of the box, of a rigid tube with an internal diameter almost equal to the diameter of the box; it is carried out successively, after disassembling the rigid tube, tapping or drawing or rolling the box in order to progressively reduce its diameter until it is brought into contact, by pressure, on the trim ring; the two ends of the box are cut beyond the fittings, taking out the corresponding racords; the vertical joint is arranged and the lead of the box is soldered with the lead of the cable by autogenous soldering. (Machine-translation by Google Translate, not legally binding)