Protective device for intermediate joint of high-voltage cable in tunnel

Abstract

The invention discloses an intermediate joint protection device for high-voltage cables in a tunnel, and the device comprises a plurality of groups of high-voltage cables laid in the tunnel, the plurality of groups of high-voltage cables are arranged in multiple layers up and down, and any group of high-voltage cable bodies comprises a plurality of fixedly connected cable bodies; an anti-explosion blocking assembly is arranged outside the high-voltage cable intermediate joint of any group of high-voltage cables and comprises a bottom anti-explosion steel plate laid at the bottom of the high-voltage cable intermediate joint, side anti-explosion steel plates arranged on the two opposite sides of the bottom anti-explosion steel plate and insulating plates arranged on the side anti-explosion steel plates. The bottom explosion-proof steel plate, the side explosion-proof steel plates and the insulating plates are mutually enclosed to form a barrier box for absorbing energy generated by explosion of the high-voltage cable intermediate joint. According to the protection device for the intermediate joint of the high-voltage cable in the tunnel, the high-voltage cable laid nearby can be protected under the condition that the intermediate joint of the high-voltage cable explodes, and the accident influence range is reduced; the structure is safe and reliable, and power supply reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit voltage testing, and particularly to a protection device for the intermediate joint of high-voltage cables in a tunnel. Background Art

[0002] In the existing technology, tunnels are increasingly used for laying high-voltage cables in high-voltage cable channels. During the laying process of high-voltage cable lines in the tunnel, due to the insufficient overall length, intermediate joints are often added. Since the environment in the tunnel is good and will not be flooded, the intermediate joints in the tunnel have fewer waterproof enclosures compared to those in cable trenches. Moreover, the environment in the tunnel is narrow, and a large number of high-voltage cables are laid in close proximity. If an explosion occurs at the intermediate joint of a high-voltage cable, the nearby high-voltage cables will be damaged due to the explosion. In severe cases, the explosion of the intermediate joint will also cause a fire, igniting a large number of cables laid concentratedly in the tunnel, causing serious damage to the power grid, reducing the power supply reliability, and resulting in a large amount of economic losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a protection device for the intermediate joint of high-voltage cables in a tunnel, which can protect the high-voltage cables laid nearby in the event of an explosion of the intermediate joint of the high-voltage cable, reduce the scope of the accident impact, and has a safe and reliable structure, increasing the power supply reliability.

[0004] To solve the above technical problem, the present invention provides a protection device for the intermediate joint of high-voltage cables in a tunnel to reduce the scope of accidents caused by the explosion of the intermediate joint of the high-voltage cable, including: multiple groups of high-voltage cables laid in the tunnel, the multiple groups of high-voltage cables are arranged in multiple upper and lower layers, and any group of high-voltage cable bodies includes multiple cable bodies fixedly connected to each other; an explosion-proof barrier assembly is installed outside the intermediate joint of the high-voltage cable of any group of high-voltage cables, and the explosion-proof barrier assembly includes: a bottom explosion-proof steel plate laid at the bottom of the intermediate joint of the high-voltage cable, side explosion-proof steel plates installed on opposite sides of the bottom explosion-proof steel plate, and insulating plates installed on the side explosion-proof steel plates. The bottom explosion-proof steel plate, the side explosion-proof steel plates, and the insulating plates enclose each other to form a barrier box for absorbing the energy generated by the explosion of the intermediate joint of the high-voltage cable; multiple fireproof packs are installed between the intermediate joint of the high-voltage cable of any group of high-voltage cables and the box wall of the barrier box, and the multiple fireproof packs completely cover the intermediate joint of the high-voltage cable located in the barrier box to isolate oxygen for combustion support.

[0005] Wherein, it further includes: multiple dry powder fire extinguishing assemblies installed in the tunnel for extinguishing open flames, and the multiple dry powder fire extinguishing assemblies are installed on the top of the intermediate joint of the high-voltage cable.

[0006] Wherein, the multiple dry powder fire extinguishing assemblies are arranged equidistantly and uniformly.

[0007] Wherein, the multiple groups of high-voltage cables are supported and fixed by multiple support frames, and the multiple support frames are regularly arranged in the tunnel.

[0008] Among them, the laying cross-section of multiple groups of high-voltage cables is in a triangular shape.

[0009] Among them, the barrier box is rectangular.

[0010] Implementing the protection device for the intermediate joint of high-voltage cables in a tunnel of the present invention has the following beneficial effects: The protection device for the intermediate joint of high-voltage cables in a tunnel includes: multiple groups of high-voltage cables laid in the tunnel, and the multiple groups of high-voltage cables are arranged in multiple upper and lower layers. Any group of high-voltage cable bodies includes multiple cable bodies fixedly connected to each other; an explosion-proof barrier assembly is installed outside the intermediate joint of any group of high-voltage cables. The explosion-proof barrier assembly includes: a bottom explosion-proof steel plate laid at the bottom of the intermediate joint of the high-voltage cable, side explosion-proof steel plates installed on opposite sides of the bottom explosion-proof steel plate, and insulating plates installed on the side explosion-proof steel plates. The bottom explosion-proof steel plate, side explosion-proof steel plates, and insulating plates enclose each other to form a barrier box for absorbing the energy generated by the explosion of the intermediate joint of the high-voltage cable; multiple fireproof packs are installed between the intermediate joint of the high-voltage cable and the box wall of the barrier box in any group of high-voltage cables, and the multiple fireproof packs completely cover the intermediate joint of the high-voltage cable located in the barrier box to isolate oxygen for combustion support, and can protect the high-voltage cables laid nearby in the case of an explosion of the intermediate joint of the high-voltage cable, reducing the scope of the accident impact; the structure is safe and reliable, and the power supply reliability is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the protection device for the intermediate joint of high-voltage cables in a tunnel according to an embodiment of the present invention.

[0013] Figure 2 It is a cross-sectional structural schematic diagram of the protection device for the intermediate joint of high-voltage cables in a tunnel according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0015] Such as Figure 1 - Figure 2As shown in the figure, it is the first embodiment of the protection device for the intermediate joint of high-voltage cables in a tunnel according to the present invention.

[0016] The protection device for the intermediate joint of high-voltage cables in a tunnel in this embodiment is used to reduce the scope of accidents caused by the explosion of the intermediate joint of high-voltage cables, and includes: multiple groups of high-voltage cables laid in the tunnel. The high-voltage cables in this embodiment are set as three groups 1a, 1b, and 1c, and the three groups of high-voltage cables 1a, 1b, and 1c form a loop and are arranged side by side in multiple upper and lower layers. Any group of high-voltage cables 1a, 1b, or 1c includes multiple cable bodies fixedly connected to each other, such as 1 - 3 cable bodies.

[0017] If any group of high-voltage cables 1a, 1b, or 1c fails, the high-voltage line will trip. Therefore, in this embodiment, an explosion-proof barrier component is installed outside the intermediate joint of the high-voltage cables in any group of high-voltage cables 1a, 1b, or 1c.

[0018] The explosion-proof barrier component includes: a bottom explosion-proof steel plate 21 laid at the bottom of the intermediate joint of the high-voltage cables, side explosion-proof steel plates 22 installed on opposite sides of the bottom explosion-proof steel plate 21, and insulating plates 23 installed on the side explosion-proof steel plates 22. The bottom explosion-proof steel plate 21, side explosion-proof steel plates 22, and insulating plates 23 enclose each other to form a barrier box T, which is used to absorb the energy generated by the explosion of the intermediate joint of the high-voltage cables; multiple fireproof packs 24 are installed between the intermediate joint of the high-voltage cables in any group of high-voltage cables 1a, 1b, or 1c and the box wall of the barrier box T, and the multiple fireproof packs 24 completely cover the intermediate joint of the high-voltage cables located in the barrier box T to isolate oxygen for combustion support.

[0019] Preferably, the multiple groups of high-voltage cables 1a, 1b, and 1c are supported and fixed by multiple support frames A, and the multiple support frames A are regularly arranged in the tunnel, and the barrier box T is rectangular. In this way, it is beneficial to achieve intensive assembly and save space.

[0020] The function of the barrier box T is: because most of the cable laying in the tunnel is in a "pin" - shaped arrangement of multiple upper and lower layers of brackets, the cable arrangement is relatively dense. If the influence range of the explosion of the intermediate joint of the high-voltage cables is large, the barrier box T is installed outside the intermediate joint of the high-voltage cables in any group of high-voltage cables 1a, 1b, or 1c, and it can block the energy of the joint explosion and reduce the mechanical damage caused by the explosion to the nearby cables.

[0021] Furthermore, multiple fireproof packs 24 are installed between the intermediate joint of the high-voltage cables in any group of high-voltage cables 1a, 1b, or 1c and the box wall of the barrier box T. The function of the fireproof packs 24 is: to isolate oxygen for combustion support and prevent a large amount of heat energy generated by the joint explosion from causing a fire.

[0022] Preferably, the multiple fireproof packs 24 completely cover the intermediate joint of the high-voltage cables located in the barrier box T.

[0023] Further, the protection device for the intermediate joint of high-voltage cables in the tunnel in this embodiment further includes: a plurality of dry powder fire extinguishing components 25 installed in the tunnel for extinguishing open flames, and the plurality of dry powder fire extinguishing components 25 are installed on the top of the intermediate joint of the high-voltage cable.

[0024] The function of the dry powder fire extinguishing component 25 is to extinguish the fire caused by the explosion of the intermediate joint of the high-voltage cable and protect the stable operation of the nearby cables in various forms.

[0025] Preferably, the plurality of dry powder fire extinguishing components 25 are arranged equidistantly and uniformly to enhance the fire extinguishing effect and range.

[0026] When the protection device for the intermediate joint of high-voltage cables in the tunnel in this embodiment is specifically implemented, the bottom explosion-proof steel plate 21, the side explosion-proof steel plates 22 and the insulating plate 23 are respectively laid on both sides and the upper and lower parts of the intermediate joint of the high-voltage cable of any group of high-voltage cables 1a, 1b, 1c to form a barrier box T for blocking the energy of the explosion. A plurality of fireproof packs 24 are installed between the intermediate joint of the high-voltage cable of any group of high-voltage cables 1a, 1b, 1c and the box wall of the barrier box T, and the plurality of fireproof packs 24 cover all the intermediate joints of the high-voltage cables located in the barrier box T to isolate oxygen and prevent fire. A plurality of dry powder fire extinguishing components 25 are suspended directly above the intermediate joint of the high-voltage cable of any group of high-voltage cables 1a, 1b, 1c to extinguish open flames. The high temperature of the large fire triggers the activation of the fire extinguishing bomb, which sprays a large amount of dry powder to extinguish the fire. In this way, the scope of the accident caused by the explosion of the intermediate joint of the high-voltage cable is reduced, the stable operation of the high-voltage cable in the tunnel is ensured, the power supply reliability is increased, and the power grid risk is reduced.

[0027] Implementing a protection device for the intermediate joint of high-voltage cables in a tunnel of the present invention has the following beneficial effects: The protection device for the intermediate joint of high-voltage cables in the tunnel includes: multiple groups of high-voltage cables laid in the tunnel, and the multiple groups of high-voltage cables are arranged in multiple upper and lower layers. The body of any group of high-voltage cables includes multiple cable bodies fixedly connected to each other; an explosion-proof barrier component is installed outside the intermediate joint of the high-voltage cable of any group of high-voltage cables. The explosion-proof barrier component includes: a bottom explosion-proof steel plate laid at the bottom of the intermediate joint of the high-voltage cable, side explosion-proof steel plates installed on opposite sides of the bottom explosion-proof steel plate, and an insulating plate installed on the side explosion-proof steel plates. The bottom explosion-proof steel plate, the side explosion-proof steel plates and the insulating plate are mutually enclosed to form a barrier box for absorbing the energy generated by the explosion of the intermediate joint of the high-voltage cable; a plurality of fireproof packs are installed between the intermediate joint of the high-voltage cable of any group of high-voltage cables and the box wall of the barrier box, and the plurality of fireproof packs cover all the intermediate joints of the high-voltage cables located in the barrier box to isolate oxygen for combustion support, and can protect the high-voltage cables laid nearby in the case of an explosion of the intermediate joint of the high-voltage cable, reducing the scope of the accident impact; the structure is safe and reliable, and the power supply reliability is increased.

Claims

1. A protective device for a high-voltage cable intermediate joint in a tunnel, used to reduce the scope of accidents caused by explosions of high-voltage cable intermediate joints, characterized in that: include: Multiple groups of high-voltage cables are laid in the tunnel, and the multiple groups of high-voltage cables are arranged in multiple layers, and any group of high-voltage cable bodies includes multiple cable bodies that are firmly connected to each other; An explosion-proof barrier assembly is installed outside the high-voltage cable intermediate joint of any group of high-voltage cables, and the explosion-proof barrier assembly includes: a bottom explosion-proof steel plate laid on the bottom of the high-voltage cable intermediate joint, side explosion-proof steel plates installed on opposite sides of the bottom explosion-proof steel plate, and an insulating plate installed on the side explosion-proof steel plates. The bottom explosion-proof steel plate, the side explosion-proof steel plates and the insulating plate are mutually enclosed to form a barrier box to absorb the energy generated by the explosion of the high-voltage cable intermediate joint; A plurality of fire-blocking bags are installed between the high-voltage cable intermediate joint of any group of high-voltage cables and the box wall of the barrier box. The plurality of fire-blocking bags completely cover the high-voltage cable intermediate joint in the barrier box to isolate oxygen from combustion.

2. The protective device for the intermediate joint of a high-voltage cable in a tunnel according to claim 1, characterized in that: Also includes: A plurality of dry powder fire extinguishing components installed in the tunnel for extinguishing open flames, wherein the plurality of dry powder fire extinguishing components are installed on the top of the intermediate joint of the high-voltage cable.

3. The protective device for the intermediate joint of a high-voltage cable in a tunnel as claimed in claim 2, characterized in that: Multiple dry powder fire extinguishing components are evenly arranged at equal distances.

4. The protective device for the intermediate joint of a high-voltage cable in a tunnel as claimed in claim 1, characterized in that: A plurality of groups of high-voltage cables are supported and fixed by a plurality of support frames, and the plurality of support frames are regularly arranged in the tunnel.

5. The protective device for the intermediate joint of a high-voltage cable in a tunnel as claimed in claim 4, characterized in that: The cross-section of multiple groups of high-voltage cables is laid in a herringbone shape.

6. The protective device for the intermediate joint of a high-voltage cable in a tunnel as claimed in claim 1, characterized in that: The blocking box is rectangular.

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