Flat copper wire embedded sheath type shield medium-and-high voltage cable and production process thereof

Abstract

The invention relates to a flat copper wire embedded sheath type shielding medium and high voltage cable and a production process thereof, belonging to the technical field of power cables. The technical solution is: conductor shielding (2), cross-linked polyethylene insulation (3) and insulation shielding (4) are sequentially arranged outside the conductor core (1), and a plurality of flat copper wires (5) are sparsely wound outside the insulation shielding. The wire is embedded in the outer sheath (6). The conductor core is covered with three layers of co-extruded conductor shield (2), cross-linked polyethylene insulation (3) and insulation shield, and the insulation shield is wrapped with multiple flat copper wires (5). The lower part is embedded with an insulating shield to form a flat copper wire shield, the flat copper wire shield is extruded and wrapped with an outer sheath (6), and the upper part of the flat copper wire is embedded in the outer sheath. The positive effects of the invention: simple structure, excellent performance; flat copper wire shielding overcomes the shortcoming of excessive internal shielding pressure of round copper wires, and at the same time has good structural dimensional stability, higher electrical safety, compact structure, and energy saving Cable costs.

Description

technical field [0001] The invention relates to a flat copper wire embedded sheath type shielding medium and high voltage cable and a production process thereof, belonging to the technical field of power cables. Background technique [0002] The existing medium and high voltage cables generally have a voltage range of 10KV and above. The copper wire shield of medium and high voltage cables adopts the type of twisted and loosely wound round copper wires. The contact area is small. After the cable runs, due to the expansion of the inner core, the round copper wire has a greater tightening force on the core. This tightening force will affect the change of the thickness of the semi-conductive layer in the long run. It even damages the insulation and has a great impact on the life of the cable. In addition, due to the needs of the power system for shielding short-circuit current, sometimes when the required shielding cross-section is large, the diameter of the round copper wire ...

AI Technical Summary

Problems solved by technology

[0002] The existing medium and high voltage cables generally have a voltage range of 10KV and above. The copper wire shield of medium and high voltage cables adopts the type of twisted and loosely wound round copper wires. The contact area is small. After the cable runs, due to the expansion of the inner core, the round copper wire has a greater tightening force on the core. This tightening force will affect the change of the thickness of the semi-conductive layer in the long run. Even damage the insulation and have a great impact on the life of the cable

In addition, due to the needs of the power system for shielding short-circuit current, sometimes when the required shielding cross-section is large, the diameter of the round copper wire for shielding will also be large, and the direct increase is the outer diameter of the cable and the thickness of the sheath. The increasingly cramped construction wiring environment has a great impact on

On the other hand, when the round copper wire is subjected to side pressure, it will slide with the insulating shielding layer and become loose and deformed, resulting in a large gap between the round copper wires, which has a great impact on the safe operation of the power system

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