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A kind of high-voltage DC cable insulating material and preparation method thereof

A cable insulation, high-voltage DC technology, applied in insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problem of less consideration of the temperature stability of the DC breakdown field strength, and achieve the improvement of the DC breakdown field strength, Effect of high DC breakdown field strength

Active Publication Date: 2020-07-10
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, when designing and developing high-voltage DC cable insulation materials, the main focus is on the space charge phenomenon in the insulation material, and less consideration is given to the temperature stability of the DC breakdown field strength.

Method used

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  • A kind of high-voltage DC cable insulating material and preparation method thereof
  • A kind of high-voltage DC cable insulating material and preparation method thereof
  • A kind of high-voltage DC cable insulating material and preparation method thereof

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preparation example Construction

[0032] Another embodiment of the present invention provides a method for preparing the above-mentioned high-voltage DC cable insulation material, including the following steps:

[0033] (1) Proportioning main materials and auxiliary materials;

[0034] (2) mixing and granulating to prepare masterbatch;

[0035] (3) cross-linking curing;

[0036] (4) Degassing treatment.

[0037] For the method of the present invention, preferably, in step (1), weigh 100 parts of low-density polyethylene, 1 to 5 parts of polystyrene, 0.8 to 2 parts of dicumyl peroxide and 0.1 to 0.5 part of antioxidant, proportioning main material and auxiliary material; in step (2), after the main material and auxiliary material configured by mass fraction in step (1) are mixed uniformly, join to twin-screw extruder, mixing Granulate.

[0038] Preferably, the rotational speed of the twin-screw extruder is 50-80r / min, and it is mixed and granulated uniformly at 125-180°C; further, the temperature of each se...

Embodiment 1

[0044] For the high-voltage DC cable insulation materials involved in this implementation, the mass fractions of each component of the raw materials are:

[0045]

[0046] After the low-density polyethylene resin, polystyrene resin and antioxidant DNP weighed according to the above proportions are pre-mixed uniformly, they are added to a twin-screw extruder. The speed of the twin-screw extruder is 50r / min, and the temperature of each section of the screw is set as follows: the feeding section is 110°C, the conveying section is 130°C, the melting section is 150°C, and the head is 160°C. After the extrusion line is cooled by water, it is air-dried and granulated. The prepared granules are pre-mixed with dicumyl peroxide evenly, and the crosslinking reaction is carried out at 160°C and 10MPa for 15 minutes; after that, they are aged at a constant temperature of 70°C for 24 hours, cooled to room temperature, and degassed at 70°C for 12 hours. Such as Figure 1(a) to Figure 1(c)...

Embodiment 2

[0048] The preparation method of high-voltage DC cable insulation material involved in this implementation, the mass fraction of each component of its raw material composition is:

[0049]

[0050] The low-density polyethylene resin, polystyrene resin and antioxidant 168 weighed according to the above ratio are pre-mixed evenly, and then added to the twin-screw extruder. The rotational speed of the twin-screw extruder is 80r / min, and the temperature of each section of the screw is set as follows: 130°C in the feeding section, 150°C in the conveying section, 170°C in the melting section, and 170°C in the head. After the extrusion line is cooled by water, it is air-dried and granulated, and the cross-linking agent is added: the prepared granules are pre-mixed with dicumyl peroxide, aged at 70°C for 24 hours, then cooled to room temperature, and degassed at 70°C 12h. Such as figure 2 As shown, the trend diagram of the DC breakdown field strength of the cross-linked polyethy...

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Abstract

The invention provides a high-voltage DC cable insulating material and a preparation method thereof, wherein the high-voltage DC cable insulating material is composed of main materials and auxiliary materials, wherein the main material is low-density polyethylene resin, and the auxiliary materials include polystyrene resin, Crosslinking agent and antioxidant. Compared with ordinary cross-linked polyethylene, the high-voltage DC cable insulating material prepared by the present invention has improved DC breakdown field strength in the temperature range of 30°C to 90°C, and the DC breakdown field strength has been increased by 72.9% at 70°C , increased by 43.7% at 90°C.

Description

technical field [0001] The invention relates to a cable insulating material, in particular to a high-voltage direct current cable insulating material and a preparation method thereof. Background technique [0002] In recent years, factors such as new energy access, long-distance power transmission, and regional grid interconnection have promoted the development of HVDC technology. As an important part of HVDC transmission projects, HVDC cables have also attracted widespread attention, especially DC cables with extruded insulation. Compared with paper insulated cables, extruded insulated DC cables have low cost, simple structure, higher operating temperature and no risk of oil leakage. The insulation material of extruded insulation DC cables is mainly cross-linked polyethylene, which is formed by cross-linking low-density polyethylene through chemical or physical methods. Crosslinking can improve the thermomechanical properties of the material while ensuring the excellent e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L25/06C08K5/14H01B3/44
CPCC08L23/06C08L2203/202C08L2207/066H01B3/441C08L25/06C08K5/14
Inventor 钟力生曹亮徐曼高景晖陈新张翀李文鹏李维康
Owner XI AN JIAOTONG UNIV