Three-core cable fusion joint and installation technology thereof

Abstract

The invention discloses a three-core cable fusion joint, and relates to the technical field of electric power transmission. The joint comprises two mutually connected cables, an inner repairing layergroup and an outer repairing layer group, wherein the inner repairing layer group and the outer repairing layer group are used for repairing the cables, each cable includes three conductor cores and an outer protection layer group coated outside the three conductor cores, the outer protection layer group includes an inner sheath layer, an armor layer and an outer sheath layer in sequence, the outer repairing layer group includes an inner sheath repairing layer, an armor repairing layer and an outer sheath repairing layer in sequence, the outer sheath repairing layer is set to be a heat shrinkable casing, and two ends, which are lapped with the outer sheath repairing layer, of the outer sheath layer are sleeved with cold shrinkage casings. The cold shrinkable casings are great in elastic shrinkage force and can carry out permanent elastic coating on the lapping parts at two ends of the outer sheath repairing layer, thereby forming interference fit for a long time, and effectively improving the relative stability between two ends of the outer sheath repairing layer and the outer sheath layer. In addition, the cold shrinkable casings can firmly adhered to the outer side of the outer sheath layer, thereby effectively improving the waterproof performance of the cable after the repair.

Description

technical field [0001] The invention relates to the technical field of power transmission, in particular to a three-core cable fusion joint and an installation process thereof. Background technique [0002] Fused cable joint is a kind of permanent joint that uses local heating enough to melt or melt the ends of two cable cores to form a continuous cable. It is usually used for cable extension and repair. [0003] In the prior art, the splicing of fusion-type cable joints includes the following steps: 1) Strip the outer coating from the ends of the two sections of cables; 2) Put the conductors of the two sections of cables into graphite molds, and fuse them with molten copper 3) Repair the insulation layer of the cable through polyethylene insulating tape. [0004] Among them, in the process of exothermic welding of two conductors, there is no reliable cooling device to make the temperature of the cable too high, which will easily lead to the aging of the plastic of the cabl...

AI Technical Summary

Problems solved by technology

However, since the three sets of guide cores are prone to offset, and at the same time under the expansion and contraction of the cable, simply using the heat-shrinkable tube will cause water leakage at the overlap between the heat-shrinkable tube and the cable, which will affect its repair effect, and needs to be improved.

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