AN INSULATION SYSTEM FOR HV CABLE JOINT, A METHOD FOR FORMING A JOINT AND A CABLE JOINT

摘要

An insulation system in a high voltage cable joint comprising a first cable end (12) of a first high voltage electric cable (10), and a second cable end (22) of a second high voltage electric cable (20). The first cable end comprises a first cable insulation layer (13) surrounding a first electric conductor (14) provided with a conductor screen (16), and the second cable end comprises a second cable insulation layer (23) surrounding a second electric conductor (24) provided with a conductor screen (26). The first and second electric conductors are electrically and mechanically connected to each other thereby forming a conductor joint (30).The first and second cable insulation layers comprise a polymer, and the insulation system further comprises a joint insulation layer (50) arranged to cover the conductor joint (30) and the cable insulation layer (13; 23) of the respective cable ends (12; 22). The joint insulation layer comprises a non-crosslinked polymer material, and the insulation system further comprises an insulation screen (60) layer provided over the joint insulation layer. Further, an intermediate layer (40) is arranged between at least apart of the respective cable insulation layers (12; 23) and the joint insulation layer (50), which intermediate layer comprises a crosslinking agent of a content that is higher than any content of crosslinking agent in the polymer material in the joint insulation layer.