The fire protection method for high-voltage cable joints includes the following steps: explosion-proof temperature and humidity sensors detect the temperature and humidity inside the fire protection box, explosion-proof pressure sensors detect the air pressure inside the fire protection box, and generate control signals based on the temperature and humidity inside the fire protection box, unit time temperature difference and temperature difference changes, and air pressure values; The first driving mechanism and the second driving mechanism respectively drive the first rotating shutter and the second rotating shutter from the first state to the second state or from the second state to the first state according to the control signal. The first state is the closed state, and the second state is the open state. The present invention is suitable for humid environments, meets the heat dissipation requirements of cable joints, and releases energy in the event of an explosion accident at the cable joint. At the same time, it meets the requirement that in the event of a fire or explosion in a power cable, it does not spread to other cables laid in the same tunnel& nbsp;

Specifically, it relates to a method for fire protection of high-voltage cable joints, suitable for fire protection in densely populated areas of high-voltage power cables such as cable tunnels, cable trenches, and cable interlayers.

Cable fires often occur at cable joints. The intermediate joint of cables is a weak link in the safe operation of power systems. Cases of cable breakage, short circuit, explosion, and even major accidents caused by overheating of cable joints are not uncommon. The llOkV cable joint in a certain cable tunnel is set in a closed protection box, which is filled with fireproof blocking material. The heat dissipation of the cable joint is not good, and there is no place to release energy when the joint explosion accident occurs. The joint box bursts instantly, causing a fire and burning adjacent cables, resulting in a large-scale paralysis of the city's power supply network.

Multiple regional power companies have put forward new fire prevention requirements for power cables laid in power tunnels: if there is a problem with one cable, it cannot spread or affect other cables laid in the same tunnel.

Underground cable tunnels and cable trenches often have poor ventilation and humid environments. To prevent cable joints from getting damp, enclosed protective boxes are often used for protection. In some engineering applications, for power cables laid on different layers of supports in cable tunnels, fireproof boards are installed at cable joints to isolate the joints from the upper and lower cable layers. However, enclosed protective boxes and fire-resistant boards are not conducive to the heat dissipation of cable joints, and are prone to heat accumulation, which is not conducive to the safe operation of cables.

The fire protection method for high-voltage cable joints can be applied to humid environments, meet the heat dissipation requirements of cable joints, and release energy in the event of an explosion accident at the cable joint. At the same time, it meets the requirement that in the event of a fire or explosion in one power cable, it does not spread to other cables laid in the same tunnel.

Compared with existing technologies, the fire protection method for high-voltage cable joints has the following advantages: by monitoring the temperature and humidity unit time temperature difference, temperature difference changes, and air pressure values inside the fire protection box, control commands are generated. When the temperature inside the fire protection box is too high due to overheating of the high-voltage cable joint, the rotating louvers are opened to dissipate heat and prevent heat from accumulating inside the fire protection box and causing explosions or fires. When a fire occurs at the high-voltage cable joint, the rotating louvers are closed to form a closed space, prevent the flame from escaping, and provide fire barriers to prevent the fire from spreading to adjacent cables, meeting the requirements for the use of other cables laid in the same tunnel when a fire or explosion occurs in one power cable. When an explosion occurs at the high-voltage cable joint, the rotating louvers are opened to provide a pressure relief channel to release energy, After releasing pressure, close the louvers in a timely manner to prevent the flame from spreading to the surrounding cables in case of an explosion and fire.