Prefabricated three-branch intermediate joint and its assembly method
A technology of intermediate joints and assembly methods, which is applied to the installation of cable joints, cable accessories, and cables. It can solve the problems of complex structure of cable three-branch joints, easy failure of spring structure, and difficult assembly, and achieve ozone resistance and UV resistance. Excellent performance, convenient and quick installation, and low cost
Active Publication Date: 2020-05-19
信承瑞(常州)电力技术有限公司
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is: in order to solve the problems in the prior art that the structure of the cable three-branch joint is complicated, the assembly is difficult and the spring structure is easy to fail, a prefabricated three-branch intermediate joint and its assembly method are now provided
Method used
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Embodiment 1
[0040] like Figure 2-5 As shown, a prefabricated three-branch intermediate joint is used to electrically connect the main cable 1 and two branch cables 2, including a heat-shrinkable tube 3, a joint insulating body 4 with a central through hole 4-1, and a single jack 5-1 single-hole stress control body 5, double-hole stress control body 6 with two branch jacks 6-1, conductor connector 7 and shielding cover 8;
[0041] The joint insulation body 4 is located in the heat shrinkable tube 3, the single-hole stress control body 5, the shield cover 8 and the double-hole stress control body 6 are all located in the joint insulation body 4, and the single-hole stress control body 5 is located in the shield The left end of the cover 8, the double-hole stress control body 6 is located at the right end of the shielding cover 8;
[0042] The conductor connector 7 is located in the shielding case 8, the left end of the conductor connector 7 has a main connection hole matched with the core...
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The invention relates to the technical field of three-branch connection of cross-linked polyethylene insulated power cables. A prefabricated three-branch intermediate joint is used for making the maincable and the two branch cables electrically connected, and comprises a heat shrinkable tube, a joint insulated body with a central through hole, a single-hole stress control body with a single insertion hole, a double-hole stress control body with two branch insertion holes, a conductor connector and a shielding cover. The single-hole stress control body and the double-hole stress control body are used, so that the prefabricated three-branch intermediate joint has high elastic deformation capability and is quite soft, fixation of the cables is facilitated, the stability during operation canbe improved, the situation that contact interface gaps discharge is avoided, a fully-shielded structure is achieved, and therefore the internal electric field of the intermediate joint is evenly distributed; meanwhile, the waterproof sealing performance is excellent; the overall product structure is simple, the size and specification are small, installation is more convenient and faster, a specialtool is not needed, the cost is low, the ozone resistance and ultraviolet resistance are good, and the intermediate joint can adapt to high-altitude and high-ultraviolet-radiation areas.
Description
technical field [0001] The invention relates to the technical field of three-branch connection of XLPE insulated power cables, in particular to a prefabricated three-branch intermediate joint and an assembly method thereof. Background technique [0002] With the continuous expansion of the urban power system, the urban planning is also constantly changing. Many original transmission lines need to be rebuilt. The carrying capacity of the original transmission lines is different from that of the newly laid cables, and three-branch connections are required; [0003] like figure 1 As shown, the main structure of the vast majority of cable three-branch joints currently on the market is: the main insulation of the main body of the joint is epoxy resin, which is formed into a whole with the metal protective shell by casting molding process, and is pressed and positioned by spring support Stress cones on both sides, tailpipes are used for grounding, and strips are used to wrap and ...
Claims
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IPC IPC(8): H02G15/18H02G15/188
CPCH02G15/1806H02G15/188
Inventor 金良赞朱志存万仁洋
Owner 信承瑞(常州)电力技术有限公司