Fireproof and explosion-proof device for intermediate joints of power cables

Abstract

The invention relates to a fireproof explosion-proof device for an intermediate joint of power cables, and belongs to the technical field of power cable joints. A cover comprises an upper cover body and a lower cover body provided with bar-shaped groove cavities respectively, the two ends of each bar-shaped groove cavity are provided with closure caps respectively, the lower edge of each closure cap is provided with a semicircular notch, the upper cover body is provided with a glue injection pipe and an exhausting pipe, the two ends of the intermediate joint penetrate through the cover, a fireproof tape of the cable wraps the exposed surface of the intermediate joint and the cover in a winding manner, and the cover is filled with a fireproof sealant. A cover type cavity is formed by means of the cover, a wrapping layer formed by the fireproof tape of the cable provides a sealed cavity environment for filling of the fireproof sealant, the airtightness of the fireproof sealant after molding is ensured, it is also ensured that the whole cover cavity is filled with the fireproof sealant and a filling layer formed by the fireproof sealant is high in intensity, the defect that the fireproof performance is durable but low in reliability is overcome, a split type assembling structure rather than molding in one step can reduce the cost in different manufacturing stages, the economic performance is improved, and the device can be widely popularized.

Description

technical field [0001] The invention relates to the technical field of power cable joints, in particular to a fireproof and explosion-proof device applied at the middle joint of power cables. 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 joint are The top priority of cable operation and maintenance work. [0003] At present, the explo...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of persistence and poor economy in the existing fireproof and explosion-proof protection measures for the intermediate joints of power cables, the present invention proposes a fireproof and explosion-proof device for intermediate joints of electric power cables, which significantly reduces the manufacturing cost and is conducive to widespread promotion. After long-term operation, it can still maintain reliable fire and explosion-proof performance, thereby reducing the possibility of potential safety hazards

Images