Prefabricated welding type cable insulation joint and manufacturing method thereof

Abstract

The invention discloses a prefabricated welding type cable insulation joint and a manufacturing method thereof. The prefabricated welding type cable insulation joint comprises a joint conductor connecting layer, an inner semi-conductive connecting layer, an insulation recovery layer, a first insulation recovery layer, a second insulation recovery layer, a first outer semi-conductive layer and a second outer semi-conductive layer. The prefabricated membranes or modules of all the layers are manufactured indoors in advance and then recovered layer by layer in a construction site, so the influence of uncontrollable factors and severe environments of site construction on joint quality can be avoided; and in addition, an annular groove is formed in a first prefabricated insulation module in anaxial direction, an annular prefabricated outer semiconductor module is arranged in the annular groove, and the first prefabricated insulation module and a second prefabricated insulation module are then subjected to heating and pressurizing together, so the first semi-conductive layer, the first insulation recovery layer and the second insulation recovery layer can be integrally formed at a time,the structure that the first semi-conductive layer is buried in the first insulation recovery layer can be synchronously formed, joint recovery time can be further shortened to 2-3 hours, and fabrication efficiency is improved.

Description

technical field [0001] The invention relates to a high-voltage power cable connector, in particular to a prefabricated welded cable insulating joint and a manufacturing method thereof. Background technique [0002] Due to the limitations of power cable production technology, site, transportation and other factors, the general length of power cables is 500-1000 meters per roll. The underwater power transmission line in the sea is very long, so it is necessary to connect each roll of power cables to meet the requirements of power transmission. [0003] At present, cable connection joints in the medium and high voltage fields are usually formed on-site. There are two common construction methods: [0004] One is to wrap the semi-conductive tape on the conductor after the conductor is connected, and then use the cross-linked polyethylene vulcanized tape of the same material as the cable insulation layer to restore the wrapping, and heat the original cable insulation layer, inner...

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Problems solved by technology

[0004] One is to wrap the semi-conductive tape on the conductor after the conductor is connected, and then use the cross-linked polyethylene vulcanized tape of the same material as the cable insulation layer to restore the wrapping, and heat the original cable insulation layer, inner The semi-conductive layer and the cross-linked polyethylene vulcanized tape are fused into an insulating whole to realize the recovery of the inner semi-conductive layer and the insulating layer; due to the harsh environment of the construction site, the adhesive tape itself has electrostatic adsorption of dust during the winding process. Natural phenomenon, dust and other impurities are easy to be brought in during operation. In addition, the drop between layers of semi-conductive strips is uneven. There are hidden dangers in electrical performance, and the insulation layer also has environmental pollution problems, and the completion time of the entire joint is about 7-10 hours;

[0005] The other is that the restoration of the insulating layer is injection-molded with cross-linked polyethylene material similar to the cable insulation, which is melted together with the cable insulating layer and the shielding layer. Although this method reduces the impact of environmental factors on the quality of the joint, it will also The construction time has been shortened to 5-7 hours, but the construction process needs supporting extrusion machines, temperature monitoring devices and other equipment. During the extrusion process, the temperature of the material in the fuselage is difficult to control and prone to scorching, and there is no cleaning of the extruder on site. The condition of the joint quality has a certain dispersion

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