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Construction and manufacture of high voltage cables
Release time:
2021-10-02
The reasons of high-voltage cable manufacturers can be divided into three categories according to different locations: cable body reasons, cable joint reasons, and cable grounding system reasons. Cable body manufacturing reasons. The problems that are prone to occur in the general cable production process are: insulation eccentricity, uneven thickness of insulation shielding layer, impurities in insulation, protruding internal and external shielding layer, uneven crosslinking, cable moisture, poor sealing of cable metal sheath, etc. Some cases are more serious and may fail soon after the completion test or operation. Most of them exist in the form of cable system defects, causing serious hidden dangers to the long-term safe operation of the cable.
High voltage cableThe reasons of manufacturers can be divided into three categories according to different positions: cable body reasons, cable joint reasons and cable grounding system reasons.
Cable body manufacturing reasons. The problems that are prone to occur in the general cable production process are: insulation eccentricity, uneven thickness of insulation shielding layer, impurities in insulation, protruding internal and external shielding layer, uneven crosslinking, cable moisture, poor sealing of cable metal sheath, etc. Some cases are more serious and may fail soon after the completion test or operation. Most of them exist in the form of cable system defects, causing serious hidden dangers to the long-term safe operation of the cable.
The reason for the manufacture of cable joints. In the past, high-voltage cable joints have winding, die-casting, molding and so on. This requires a lot of on-site production work. Due to the limitations of field conditions and production processes, there are inevitably air gaps and impurities between insulating tapes, which are prone to problems. The types commonly used in China are assembly type and assembly type. Cable joints are divided into cable terminal joints and cable intermediate joints. Regardless of the joint form, the failure of the cable joint usually occurs at the break of the cable insulation shield, because this is the place where the electrical stress is concentrated. The causes of cable joint failure due to manufacturing reasons include stress cone manufacturing defects, insulating packing problems, sealing ring oil leakage, etc.
Cable earthing system.Power cable factory, State Grid bidding cable factoryHomeRemind you that the grounding system includes cable grounding box, cable grounding protection box (with sheath protector), cable cross interconnection box, sheath protector, etc. Common problems are mainly due to poor sealing of the box, resulting in multi-point grounding and excessive induced current in the metal sheath. In addition, the parameter selection is unreasonable or the quality of the protective layer protector is poor, and the zinc oxide crystal is unstable, which can easily cause damage to the protective layer protector. There are many cases of high-voltage cable system failure caused by construction quality,
The main reasons are: First, the site conditions are relatively poor. Cables and connectors have high environmental and technological requirements when they are manufactured in the factory, and the temperature, humidity and dust on the construction site are difficult to control. Second, during the cable construction process, it is inevitable to leave tiny sliding marks on the insulation surface, and semiconductor particles and sand particles on the emery cloth may be embedded in the insulation. In addition, because the insulation material is exposed to the air during the joint construction, it will inhale the moisture in the insulation material, leaving hidden dangers for long-term safe operation. Third, the installation is not strictly in accordance with the process of construction or process regulations, did not consider possible problems. Four is the final acceptance of the DC voltage test, resulting in the formation of anti-electric field at the joint, resulting in insulation damage. Five is caused by poor sealing treatment. The middle joint must adopt the sealing structure of metal copper shell and PE or PVC insulation anti-corrosion coating to ensure the compactness of the lead seal on site, so as to effectively ensure the sealing and waterproof performance of the joint.
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