10kV cable fusion joint 3 * 300 fusion type intermediate joint community distribution cable repair joint set

Description :

　　10kV three core cable fusion joint is a specialized electrical connection device used for intermediate connection or repair of medium voltage power cable lines. It mainly solves the pain points of traditional mechanical connections or ordinary heat shrink joints, such as easy loosening, high contact resistance, and easy heating and oxidation during long-term operation. It is particularly suitable for urban power grid renovation, underground pipe gallery cable laying, and rapid repair and restoration of power supply for faulty cables. The cable fusion joint integrates the cable conductor and connecting pipe through a special fusion process, achieving true "seamless docking" and ensuring efficient and stable current transmission. Typical operating conditions cover 10kV voltage level transmission and distribution networks, making it an ideal connection solution for three core cross-linked polyethylene insulated cables.

　　The core specifications of the cable fusion joint are compatible with three core copper cables with cross-sections of 3 * 240mm ² and 3 * 300mm ². The main structure consists of high-strength conductive copper tubes, a semi conductive shielding layer, an insulation recovery layer, and an outer sheath. In terms of manufacturing process, advanced friction welding or hot melt technology is adopted to ensure that there is no air gap or virtual connection at the conductor connection, and the contact resistance is lower than that of the same length cable body. The execution standards usually refer to GB/T 12706 and DL/T related power industry standards, which have excellent electrical insulation performance, mechanical tensile strength, and corrosion resistance. The product undergoes strict power frequency withstand voltage testing, partial discharge testing, and thermal cycling testing to ensure long-term insulation reliability and structural integrity even in harsh environments such as humidity and soil corrosion.

　　When selecting, it is necessary to strictly check the voltage level (10kV), number of cores (three cores), and cross-sectional area of the conductor (240mm ² or 300mm ²) of the cable. Different cross-sectional cable fusion joints cannot be mixed, otherwise it will cause uneven electric field distribution and breakdown. This product is particularly suitable for State Grid renovation projects that require compact space and low maintenance costs. Compared to traditional cold or heat shrink joints, it has a smaller volume and stronger overall integrity after installation. If the cable is made of aluminum core or single core structure, this model is not applicable and the corresponding aluminum core dedicated or single core fusion joint should be selected. When selecting, the purchaser should also confirm whether the on-site construction conditions have the operating space for specialized melting equipment, and whether a waterproof protective box is needed to cope with the direct burial environment.

　　When installing 10kV three core cable fusion joints, specialized fusion welding equipment must be used, and the stripping size diagram must be strictly followed to ensure that the semiconductor layer is stripped flat and the main insulation layer is not damaged. After the connection is completed, insulation recovery treatment should be carried out and stress control tubes should be installed to evenly distribute the electric field. The typical usage cycle can reach 20-30 years, and no special maintenance is required on a daily basis. However, it is recommended to regularly use an infrared thermometer to detect the surface temperature of the joint and identify abnormal hotspots. Common faults are often caused by improper construction, resulting in insulation layer damage or inadequate sealing and water ingress. Therefore, sealing and waterproofing treatment after construction is crucial. If discharge sound or abnormal temperature rise is found at the joint, power should be cut off immediately for inspection to avoid the fault expanding and affecting the safe operation of the power grid.

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