A split-type high-voltage cable joint protection explosion-proof fire extinguishing box

Abstract

The invention relates to a split type high-voltage cable connector protection explosion-proof fire-extinguishing box comprising a shell body. A split structure composed of two semi-cylindrical shells is formed in the middle part of the shell body. Each semi-cylindrical shell is made of stainless steel material through one-time rolling. The external part of the shell body is circumferentially provided with multiple reinforcing ribs. The two ends of the shell body use a gradient tightening mouth structure, and a cylinder is formed at the tightening mouth. The internal part of the tightening mouth is provided with a groove type waterproof sealing member which is integrally formed. The cylinders of the two ends are internally provided with a main cable installing port and a grounding cable installing port respectively. The aperture of the main cable installing port is greater than that of the grounding cable installing port. The two cylinders are respectively provided with an elastic explosion-proof heat-insulating protection plate and a temperature sensing automatic fire-extinguishing device. The middle part of the semi-cylindrical shell arranged at the upper part is provided with two energy discharge holes which are arranged in a spacing way. The two energy discharge holes are respectively provided with an extruding type silicone rubber sealing gasket and a sealing flange. The two sides of the semi-cylindrical shell arranged at the lower part are respectively provided with a material feeding hole. The two material feeding holes are respectively provided with a sealing flange.

Description

technical field [0001] The invention relates to a cable joint protection device, in particular to a split-type high-voltage cable joint protection explosion-proof fire extinguishing box. Background technique [0002] It is well known that the main material of the shell of the cable joint explosion-proof product is iron plate or steel plate, and the body of the cable joint explosion-proof product must be sealed; the so-called explosion-proof means that the explosion-proof effect can only be achieved when it is fully sealed. Because if the cable is not fully sealed when sparks are generated, there will be oxygen and air, so a fire will occur, and then an explosion will occur. Therefore, if the explosion-proof product is not completely sealed, it is absolutely impossible to achieve the explosion-proof effect. [0003] The AC and DC high-voltage cable accessories currently used in the power system are currently divided into domestic, joint venture and imported, and the accident...

AI Technical Summary

Problems solved by technology

[0003] The AC and DC high-voltage cable accessories currently used in the power system are currently divided into domestic, joint venture and imported, and the accidents of the cable intermediate joints are mostly caused by several situations: 1. Debris is piled up in the cable tunnel, the dust on the cable or cable bracket is too thick, the cable There is flammable gas and flammable liquid leakage in the tunnel, which is ignited by high temperature or open flame, and cable fire or explosion occurs

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, which will cause the insulation material to age, resulting in a decrease in insulation performance, breakdown and ignition

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 and outer layers of the cable.

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

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

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

7. The copper bar and grounding cable of the grounding box of the high-voltage cable joint were stolen, and the cable joint did not have a grounded neutral point, causing a short circuit and an explosion

[0004] Since most of the cable joints are run in cable trenches or cable tunnels, many accidents are affected by the operating environment, at least accounting for more than half of the factors, because they are often soaked in water, damp, air, etc., and then the cable head hits wear, spontaneous combustion, and more seriously, other cables will be damaged or even burned after the explosion.

Images