Fireproof and explosion-proof structure at intermediate of cable and installation and application method thereof

Abstract

The invention discloses a fireproof and explosion-proof structure at the intermediate joint of a cable and an installation and application method thereof, and belongs to the technical field of cable joint fire and explosion prevention. The fireproof and explosion-proof structure comprises an outer box body, an assembling end cover, a sealing end cover and a sealing ring, wherein the longitudinal assembling surface of the outer box body is provided with a dual-sealing structure; the assembling end cover adopts an embedded sealing structure with the outer box body; the sealing end cover and the sealing ring are arranged on the assembling end cover for sealing a gap between a cable ring surface and a related matching surface of the assembling end cover; the outer box body is provided with a glue injecting pipe and an exhaust pipe; the cable is completely wrapped by a cable fireproof wrapping tape after being connected by the intermediate joint, and the cable is placed in the outer box body; and a fireproof sealing glue is injected into the outer box body through the glue injecting pipe. Operationally, firstly air inside the outer box body is exhausted out by using carbon dioxide or nitrogen, and then the fireproof sealing glue is injected inwards for carrying out high pressure shaping. The outer box body is used for carrying out pressure maintaining shaping on the fireproof sealing glue to realize sealing protection for the joint of the cable, and a compact filling layer can be formed on the periphery of the intermediate joint, so that the defect that the enduring stability of fireproof performance is poor is solved, the manufacturing cost is low, and the structure is beneficial for popularization.

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 ...

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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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