Insulation structure and high-voltage direct-current cable

Abstract

The invention discloses an insulation structure which comprises multiple layers of annular structures, each layer of annular structure comprises a base body, the base body is made of a mixed material of a basic material and a cross-linking agent, and the content of the cross-linking agent in the mixed material used by the base body of each layer of annular structure is gradually increased from the inner layer to the outer layer. The invention further discloses a high-voltage direct-current cable, the high-voltage direct-current cable comprises a conductor and a protective layer, the protective layer comprises an insulating layer, the insulating layer is arranged outside the conductor, and the insulating layer adopts the insulating structure. According to the insulation structure and the high-voltage direct-current cable comprising the insulation structure, the insulation performance of each position of the insulation structure is uniform, the electrical insulation performance can be improved, the electrical insulation performance of the high-voltage direct-current cable can be improved, the internal and external temperature difference of the insulation layer in the high-voltage direct-current cable can be reduced, and the service life of the high-voltage direct-current cable is prolonged. The problem of electric field inversion in the insulating layer is weakened, and the working temperature of the high-voltage direct-current cable is improved.

Description

technical field [0001] The invention belongs to the technical field of cables, and in particular relates to an insulating structure and a high-voltage direct current cable including the insulating structure. Background technique [0002] During the manufacturing process of the HVDC cable, due to the difference in the thermal processing temperature experienced inside and outside the insulation layer of the HVDC cable, the degree of cross-linking of the insulation layer from the inside to the outside is gradually reduced (such as image 3 shown), and, in the process of removing by-products from the HVDC cable, due to the different decomposing and efflux speeds of the cross-linked by-products from the inside to the outside of the insulating layer, the residual amount of cross-linked by-products in the insulating layer gradually increases from the inside to the outside. reduce (eg Figure 5 shown), resulting in uneven insulation performance of the insulating layer, resulting in ...

AI Technical Summary

Problems solved by technology

[0002] During the manufacturing process of high-voltage DC cables, due to the different thermal processing temperatures experienced inside and outside the insulation layer of high-voltage DC cables, the degree of cross-linking of the insulation layer from the inside to the outside gradually decreases (such as image 3 Shown), and, in the process of removing by-products in high-voltage DC cables, due to the different speeds of decomposition and discharge of cross-linked by-products from the inner side to the outer side of the insulating layer, the residual amount of cross-linked by-products in the insulating layer gradually increases from the inner side to the outer side. decrease (eg Figure 5 As shown), resulting in uneven insulation performance of the insulating layer, resulting in the decline of the electrical insulation performance of high-voltage DC cables

[0003] In addition, during the operation of DC cable equipment, as the power load changes, there is a temperature difference between the inside and outside of the insulation layer of the high-voltage DC cable, and the electric field is affected by the temperature gradient, which will cause problems such as reversal inside the insulation layer, which directly affects the safety of the cable. , Stable operation, and the large internal and external temperature difference will also limit its working temperature, resulting in its inability to operate at high temperature, and the inability to operate at high temperature means to reduce capacity operation, which will not only waste resources, but also limit the increase of voltage level , will not be able to meet user needs in the long run

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