Integral high-voltage-cable anti-explosion joint box

Abstract

The invention relates to an integral high-voltage-cable anti-explosion joint box used for protecting safety of a high voltage cable joint in an underground cable channel. The anti-explosion joint box comprises a cable support, a shell which is arranged on the cable support and forms one body and an anti-explosion fire extinguishing component arranged in a central-section anti-explosion chamber of the shell. The shell is in a shuttle-shape symmetrical structure. Two ends are provided with cable holes. The cable holes are provided with sealing components. A cable joint is arranged in the central-section anti-explosion chamber. The anti-explosion fire extinguishing component is connected to the cable joint. The shell is provided with a plurality of energy leakage hole guide pipes connected to the central-section anti-explosion chamber. Other spaces in the central-section anti-explosion chamber are filled with a fireproof thermal-insulation flame-retardant material. Compared to the prior art, the joint box possesses the advantages that moisture-proof, explosion-proof and fireproof performance is possessed; the joint box is safe and reliable; the structure is simple; cost is low and so on.

Description

technical field [0001] The invention relates to the field of electrical safety, in particular to an integral high-voltage cable explosion-proof joint box. Background technique [0002] As we all know, the cable intermediate joint is the weakest link of the cable. Our power system, power plant, nuclear power plant, petrochemical industry and other industries will inevitably use cable intermediate joints in the process of using cables, especially for large-section cables. According to this calculation, it is basically necessary to make a cable intermediate joint every 500 meters. If several cables are discharged together, it can be seen that there are too many intermediate joints in the cable, which just increases the potential safety hazard of the cable operation. Although the power system is well aware of this disadvantage, we are well aware of the high cost of 110kV and 220kV cables. The transformation of distribution network itself is to beautify the appearance of the ci...

AI Technical Summary

Problems solved by technology

[0004] 1. There are sundries piled up in the cable tunnel, too thick ash accumulation on the cable or cable support, flammable gas and flammable liquid leakage in the cable tunnel, etc., which are ignited by high temperature or open flame, and cable fire or explosion occurs;

[0005] 2. The distance between the cable and the heat pipe is too close or the cable is overloaded for a long time, and the temperature is too high to age the insulating material, resulting in a decrease in insulation performance and breakdown and ignition;

[0006] 3. The protective layer of the cable is damaged during cable laying or the cable insulation is mechanically damaged during operation, causing insulation breakdown between the phases of the cable and the outer layer;

[0007] 4. In the 1980s and 1990s, when the oil-immersed cables were laid, the height difference was large, and oil dripping or oil leakage from the cable head occurred, resulting in the loss of insulating oil at the high-level cable end, and the thermal resistance increased, and the insulation coking caused breakdown and fire;

[0008] 5. The cable intermediate joint is not crimped tightly, welded is not firm, and oxidation occurs during operation; the dosage of insulating material injected into the cable intermediate joint box does not meet the requirements, or there are air holes in the box when pouring; the cable box is poorly sealed or damaged cracks are immersed in moisture , so that insulation breakdown, fire and explosion;

[0009] 6. The surface of the cable head is damp or polluted, the casing of the cable head is broken, and the distance between the lead wires is too small, which leads to flashover and fire;

[0010] 7. The main insulation layer is damaged during the construction of cable accessories

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