Wrapping and molding manufacturing method for middle connector of cross-linked polyethylene insulated power cable

Abstract

The invention provides a wrapping and molding manufacturing method for a middle connector of a cross-linked polyethylene insulated power cable. The wrapping and molding manufacturing method comprises the following steps of step a, removing an outer sheath and a metal sleeve from a cable at two ends, and reserving a water-blocking buffer band; step b, performing cable preprocessing; step c, welding a wire core conductor; step d, recovering an inner semi-conductive layer: cleaning the port of the semi-conductive layer, and then wrapping the conductor with a semi-conductive layer wrapping band; step e, recovering an insulating layer; and step f, recovering an outer semi-conductive layer. The manufacturing method provided by the invention is convenient to operate; the manufactured middle connector and the cable body form an integrated structure; the electric field stress is uniform in distribution while the electric performance is stable; and the problem of a movable interface generated by different materials between the cable and the middle connector, and the problem of breakdown of the middle connector of the cable caused by partial electric field distortion of the insulating layer due to space accumulated charge are solved.

Description

technical field [0001] The invention relates to a process technology for an intermediate joint of a cross-linked polyethylene insulated cable, which is suitable for a production method of on-site wrapping molding for the intermediate joint of a 500V to 48kV cross-linked polyethylene cable. Background technique [0002] The cable joint in the middle part of the traditional 500V to 48kV XLPE insulated power cable is an intermediate joint. The conductor of the intermediate joint is crimped and connected, and the cable is connected by adding an insulating medium. The electric field will produce distortion. In order to overcome Due to the influence of electric field distortion, the stress tube design is required at the cable conductor crimping part of the main body of the cable intermediate joint, and the stress cone design is required at the cutting part of the semiconductive layer in the cable. [0003] Up to now, the whole world has made considerable achievements in the techni...

AI Technical Summary

Problems solved by technology

This kind of prefabricated cable accessories, due to its own structural problems, can only weaken the concentrated distortion field strength of the uniform cable and cannot achieve the electric field distribution state equivalent to the original cable to eliminate the cable field strength distortion, and between various insulating media It cannot solve the problem of the air gap at the mating interface. The active interface contains complex factors such as air gap, micro water, impurities and insulating grease, which can easily lead to the discharge of the air gap along the surface and the accumulation of charges in the space, resulting in local electric field distortion, and finally leads to insulation shock. wear, restricting the safe operation of the cable system

Images