Processing and forming method for insulation of direct-current cable joint main body
A DC cable, processing and forming technology, applied in the assembly/disassembly of contacts, manufacturing of contact boxes/bases, etc., can solve problems such as failure of normal production and failure to realize products normally
Pending Publication Date: 2021-12-31
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
[0006] In view of this, the present invention proposes a processing and molding method for the main body insulation of the DC cable joint, aiming at solving the problem of interface force, temperature conduction, flow time and other processes during the forming process when the main body insulation volume of the existing cable joint is too large. Realize the problems that prevent the product from being produced normally
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[0028] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0029] see figure 2 , which is a flowchart of a method for processing and forming insulation of a main body of a DC cable joint provided by an embodiment of...
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Abstract
The invention provides a processing and forming method for insulation of a direct-current cable joint main body. The method comprises the steps of mounting a high-voltage electrode stress control module and a low-voltage electrode stress control module on a mold core rod of a joint forming mold; performing layer-by-layer injection molding processing on a joint insulator layer by layer of the direct-current cable joint main body; performing injection molding processing on an outer shielding layer on the outer layer of the joint insulator; and taking out the direct-current cable joint main body from the joint forming mold, and performing vulcanization heating treatment on the direct-current cable joint main body. According to the invention, layer-by-layer injection molding processing is carried out on the joint insulator of the direct-current cable joint main body layer by layer, and the injection molding processing is carried out layer by layer from inside to outside by changing the mold cavity, so that uniform-thickness injection vulcanization molding of insulating rubber from inside to outside is realized, internal stability, balanced pressure and good exhaust of each layer of insulating rubber are ensured, insufficiency in insulation and breakdown caused by the problems of bubbles, poor vulcanization and the like in large-thickness insulation are avoided.
Description
technical field [0001] The invention relates to the technical field of cable joints, in particular to a method for processing and forming insulation of a main body of a DC cable joint. Background technique [0002] HVDC transmission has the advantages of large transmission capacity, long transmission distance, low line cost and low power loss. As the physical foundation and key equipment of DC power grid construction, high-voltage DC cables and accessories are an important foundation for the construction and development of DC power grids. Since the DC cable joint is a coaxial layered structure with different insulators. The large difference in conductivity between the cable main insulation such as cross-linked polyethylene (XLPE) and the reinforced insulation layer silicone rubber (SR) will cause severe deformation of the electric field at the stress cone, resulting in a local electric field greater than its breakdown field strength , and eventually breaks down. Therefore...
Claims
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IPC IPC(8): H01R43/18H01R43/24
CPCH01R43/18H01R43/24
Inventor 刘宗喜欧阳本红刘松华王昱力王格夏荣赵鹏黄凯文邓显波李文杰
Owner CHINA ELECTRIC POWER RES INST