Fire-proof and explosion-proof structure at the middle joint of the cable and its installation and use method
A technology of cable intermediate joints and explosion-proof structures, which is applied in the direction of cable joints, equipment for connecting/terminating cables, etc., can solve the problems of poor durability and low manufacturing cost, and solve the problems of poor durability and low manufacturing cost , cost reduction effect
Inactive Publication Date: 2017-10-31
国网江西省电力有限公司九江供电分公司 +2
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Problems solved by technology
[0006] Aiming at the defects of poor durability in the fire and explosion-proof protection measures of the cable intermediate joints in the existing power system, the present invention proposes a fire-proof and explosion-proof structure at the cable intermediate joint and its installation and use method, which aims at the main cause of the cable burning. In addition, the flame-retardant and explosion-proof treatment of the cable joints can maintain reliable fire-proof and explosion-proof properties after long-term operation, significantly reducing the safety hazards caused by cable burning, and the manufacturing cost is low, which is conducive to widespread promotion
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[0057] In order to facilitate the understanding of the technical content of the present invention, the technical solutions thereof will be further described below in conjunction with the accompanying drawings.
[0058] Such as figure 1 The shown fireproof and explosion-proof structure of a cable intermediate joint includes an outer box body 1 formed by buckling the upper half outer box 11 and the lower half outer box 12, an assembly end cover 2 connected to the left and right ports of the outer box body 1 and The sealing end cap 3 and the sealing ring 4 are arranged on the assembly end cap 2 .
[0059] Such as figure 1 , Figure 4 As shown, corresponding mold grooves are provided on the upper half outer box 11 and the lower half outer box 12, and axially extending flanges 10 are respectively arranged on both sides of the transverse ports of the mold grooves. The groove here is as Figure 4 The settings shown are semicircular. On the lower end surface of the flange 10 of t...
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The fire-proof and explosion-proof structure at the middle joint of the cable and its installation and use method belong to the technical field of fire-proof and explosion-proof for cable joints, including an outer box body with a double-sealing structure on the longitudinal assembly surface, an assembly end cover and a device with an embedded sealing structure with the outer box body. On the assembly end cover, the sealing end cover and the sealing ring are used to seal the gap between the cable ring surface and the related mating surface of the assembly end cover. The outer box body is provided with a rubber injection pipe and an exhaust pipe. The fireproof tape is completely wrapped and placed in the outer box body, and the fireproof sealant is injected into the outer box body through the injection tube. In operation, first use carbon dioxide or nitrogen to discharge the air in the outer box, and then inject fireproof sealant inside and carry out high-pressure shaping. It relies on the outer box body to maintain pressure and shape the fireproof sealant to realize the sealing protection of the cable joints, and can form a dense filling layer around the middle joint, which solves the defect of long-lasting and poor reliability of the fireproof performance, and the production cost is low. Good for promotion.
Description
technical field [0001] The invention relates to the field of fireproof and explosion-proof technology for cable intermediate joints in electric power systems, in particular to a fireproof and explosion-proof structure for cable intermediate joints and an installation and use method thereof. Background technique [0002] With the continuous improvement of the degree of cableization of urban power lines, the cable failure rate is also rising. Operating experience has proved that more than 80% of cable failures are related to cable accessories, and cable intermediate joint failures have the highest failure rate among cable accessories. Due to the flaws in the quality and installation process of the cable intermediate joint itself, once the cable intermediate joint explodes, it will often ignite the cable body and even damage the surrounding adjacent cables, causing huge losses to the power system. Therefore, the fire and explosion protection measures for the cable intermediate ...
Claims
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IPC IPC(8): H02G15/10H02G1/14
CPCH02G1/14H02G15/10
Inventor 但春生汪泉李中龙徐厚玲占少华江民标时晓辉叶斌柯涛叶茂
Owner 国网江西省电力有限公司九江供电分公司