10kV cross-linked cable fusion joint 3 * 400 square underground pipe gallery waterproof insulation molded joint

Description :

  The 10 kV cable fusion joint is a key accessory used for connecting medium voltage power cables, mainly to solve the electrical connectivity problem of segmented cable connection or fault repair in long-distance transmission. This 3 * 400 specification product is designed specifically for three core cross-linked polyethylene insulated cables with a cross-sectional area of 400 square millimeters, achieving seamless integration of the conductor and insulation layer through molding technology. Typical working conditions include urban underground pipe galleries, substation outgoing terminals, and main line connections in large industrial plants, ensuring the stability and safety of current transmission in high voltage environments, effectively reducing contact resistance, and preventing operational accidents caused by local overheating.

  The cable fusion joint adopts advanced molding vulcanization technology to ensure that the insulation layer has the same physical and chemical properties as the original cable body. The implementation standards usually refer to GB/T 12706 and DL/T related power industry standards. The withstand voltage level should meet the requirements of a 10kV system, and the power frequency withstand voltage test should meet the requirement of 30.5kV/5min without breakdown. In terms of materials, the conductor connecting tube is made of high-purity electrolytic copper, and the insulation material is imported cross-linked polyethylene special material. The interface between the semiconducting layer and the main insulation layer transitions smoothly. The waterproof structure design includes multiple layers of sealed sheaths to adapt to the humid environment of underground pipe galleries. The insulation resistance value is usually greater than 1000M Ω at room temperature, and the local discharge is controlled within 10pC to ensure long-term electrical reliability.

  When selecting, it is necessary to specify the specific cable model (such as YJV22, YJV, etc.) and cross-sectional dimensions. This 3 * 400 model is only suitable for three core cables with a nominal cross-sectional area of 400mm ². If the cable cross-section does not match or the number of cores is different (such as single core or four core), the corresponding specification product should be selected and cannot be mixed. Compared with traditional cold shrink or heat shrink joints, the advantage of molded fusion joints is better insulation integrity, no interface air gaps, and especially suitable for underground pipe galleries or direct buried laying scenarios with extremely high waterproof and moisture-proof requirements. Not suitable for temporary repairs or situations with extremely short construction time requirements, as the molding process requires specialized heating and vulcanization equipment, and the on-site construction period is relatively long. However, it is recommended to use for backbone networks with high long-term operating life requirements.

  The installation of 10 kV cable fusion joints requires professional personnel with qualifications for installing high-voltage cable accessories. Before construction, the insulation surface of the cable must be thoroughly cleaned, and the stripping size must strictly comply with the requirements of the process drawings, with errors controlled within millimeters. Accurate control of temperature and time is required during the vulcanization process to ensure sufficient cross-linking reaction. In daily maintenance, it is recommended to use an infrared thermometer to detect the temperature at the joint area in conjunction with the power outage maintenance cycle. If there is any abnormal temperature rise, it should be promptly investigated. Common faults are often caused by insulation defects or moisture infiltration due to improper construction techniques, so humidity control and moisture-proof measures in the construction environment are crucial. Regularly check the integrity of the outer sheath to prevent mechanical damage from affecting the waterproof performance and ensure the safe and stable operation of the cable system in the underground pipe gallery.

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