Prefabricated cable intermediate joint adopting composite material with electrical conductivity being adaptively regulated and controlled

Abstract

The invention provides a prefabricated cable intermediate joint adopting a composite material with the electrical conductivity being adaptively regulated and controlled, and belongs to the technical field of high-voltage AC / DC cable accessories. The prefabricated cable intermediate joint comprises stress cones, a high-voltage shielding layer, an enhanced insulator, an outer shielding layer, a cable inner shielding layer, a metal connecting pipe, a cable insulating layer and a cable insulation shielding layer, and is characterized in that the cable inner shielding layer, the metal connecting pipe, the cable insulating layer and the cable insulation shielding layer are located at the inner sides of the enhanced insulator and the high-voltage shielding layer; the stress cones and the high-voltage shielding layer are made of a composite material with the electrical conductivity being adaptively regulated and controlled which is composited by zinc oxide ceramic powder particles and siliconrubber; the outer shielding layer is composited by silicon rubber and carbon black; the enhanced insulator adopts the silicon rubber. The voltage class application range of the prefabricated cable joint to be further expanded, and an effect of excellently unifying the field intensity is played. Meanwhile, the prefabricated cable intermediate joint not only solves a problem of centralized field intensity at notch of the cable insulation shielding layer and a junction of a cable conductor, but also enables a problem of centralized field intensity at the conical surface of the stress cones and the high-voltage shielding layer to be solved, thereby improving the reliability of long-time running of an electric power system.

Description

technical field [0001] The invention belongs to the technical field of high-voltage AC and DC cable accessories, and in particular relates to a prefabricated cable intermediate joint using a conductivity self-adaptive regulation composite material, which is suitable for AC and DC power systems. Background technique [0002] With the continuous increase of social electricity consumption and the vigorous development of clean energy, people need to transmit more electricity to densely populated areas. On the one hand, clean energy sources are mostly located in remote areas or areas such as the sea, and traditional overhead lines are no longer suitable for transporting electrical energy to areas where electricity is concentrated. On the other hand, the use of space resources and the emphasis on urban beauty in densely populated cities make it no longer suitable for overhead lines to transmit electric energy. Therefore, it is necessary to adopt a power transmission method with a...

AI Technical Summary

Problems solved by technology

The traditional prefabricated cable joint stress cone 1, high-voltage shielding layer 3 and outer shielding layer 4 are all made of semi-conductive materials composed of silicone rubber and carbon black, and the reinforced insulator 2 is made of silicone rubber, although the cable insulation shielding layer can be made 9 The field strength at the cutout and the connection of the cable conductor 5 is uniform, but the field strength concentration phenomenon still occurs on the cone surface of the stress cone 1 and the surface of the high-voltage shielding layer 3, thus limiting the application voltage level of the traditional prefabricated cable intermediate joint

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