Polypropylene 10kV molded cable joint and manufacturing method thereof

Abstract

The invention discloses a polypropylene 10kV molded cable joint and a manufacturing method thereof, and the method comprises the steps: respectively sawing two fractures at the butt-joint ends of twopolypropylene 10kV molded cables in the radial direction, stripping an outer protection layer, an armor layer and an inner protection layer, and then stripping a copper shielding layer, an outer semi-conductive layer, an insulating layer and an inner semi-conductive layer; winding a plurality of layers of heat insulation adhesive tapes on the exposed outer semi-conductive layer, the insulating layer and the inner semi-conductive layer, and performing exothermic welding on the cable conductors at the two ends of the cable to form welded conductors; recovering the inner semi-conductive layer, wrapping the inner semi-conductive layer with a polypropylene insulating tape, heating the polypropylene insulating tape, and then cooling the polypropylene insulating tape in a segmented manner, so that the cable is insulated, and the inner semi-conductive layer and the wrapping insulation are fused; and then recovering the outer semi-conductive layer, the copper shielding layer and the protectivelayer. The joint insulating layer is made of a polypropylene-based insulating material, has excellent insulating property and heat resistance, can be in interface-free butt joint with an environment-friendly polypropylene insulating cable, and is suitable for field manufacturing, convenient to operate and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of cable connection, in particular to a polypropylene 10kV molded cable joint and a manufacturing method. Background technique [0002] With the rapid development of the power industry, the demand for cable installation in urban power grid transformation is increasing. Power cables have the advantages of excellent insulation performance, high power supply reliability, no floor space, and large transmission capacity. They are gradually replacing overhead lines and are being used more and more widely. The length of each distribution network cable is about 600 meters, and the cable line must be provided with an intermediate joint at a certain distance, and the cable intermediate joint is often the weakest position in the electrical performance of the cable line, so the quality of the cable joint is to determine the quality of the cable. An important factor for the safe and stable operation of the line. [000...

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used cables are cross-linked polyethylene cables, but cross-linked polyethylene cables have the following problems: the cross-linking agent used in the production of cables and by-products such as cumyl alcohol and benzophenone produced during the cross-linking process may enter Insulation layer, which causes electric field distortion and accelerates insulation aging; production speed is limited by cross-linking and degassing processes; after reaching the service life, thermosetting cross-linked polyethylene insulation waste is difficult to recycle and reuse, etc.

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