Solar Street Light&Flood Light Ningbo Wason Lighting Technology Co.,Ltd , https://www.wasonlights.com
1. Causes of manufacturing of cable body Generally, the problems that are likely to occur in the cable production process include eccentricity of insulation, uneven thickness of insulation shield, impurities in insulation, protrusions inside and outside shielding, uneven degree of cross-linking, moisture in cable, and sheathing of cable metal sheath. Bad and so on, some situations may be more serious. Faults may occur during or shortly after completion of the test. Most of them are in the form of defects in the cable system, causing serious risks to the long-term safe operation of the cable.
2. Reasons for the production of cable joints High-voltage cable joints have previously used wrap-around type, die-cast type, and molded type, which require a large amount of work to be produced on site, and due to the limitations of on-site conditions and the manufacturing process, the insulating tape layers cannot be used. Avoid air gaps and impurities, so problems can easily occur. The types commonly used in China are assembly and prefabrication.
3. Cable Grounding System The cable grounding system includes the cable grounding box, the cable grounding protection box (with protective layer protector), the cable cross-connection box, and the protection layer protector. The general problem that is easy to occur is mainly because the poor sealing of the box body leads to multi-point grounding, causing the metal sheath induction current to be too large. In addition, the selection of protective layer protector parameters is unreasonable or the quality of the zinc oxide crystal is unstable, and it is easy to cause damage to the protective layer protector.
4. Reasons for Construction Quality The site conditions are relatively poor. The environment and process requirements for cables and joints are high at the time of factory manufacture. The temperature, humidity, and dust on the construction site are not well controlled. In the process of cable construction, it will inevitably leave tiny sliding marks on the insulating surface. The semi-conductive particles and the sand on the abrasive cloth may also be embedded in the insulation. In addition, during the construction process of the joint, the insulation is exposed to the air, and the insulation also absorbs moisture. All these leave hidden dangers for long-term safe operation.
5, the design of the cause due to thermal expansion of the cable caused by cable crushing lead to breakdown. When the cross-linking cable load is high, the temperature of the core is increased, the cable is heated to expand, and the cable is turned on the bracket elevation at the turning point in the tunnel. The long-term heavy-duty operation of the cable has a large amount of peristaltic force, causing the bracket facade to crush the outer jacket of the cable. , metal sheathing, intrusion into the cable insulation leads to cable breakdown
Fault Analysis of YJV High Voltage Cable
The fault analysis cable of YJV high-voltage cable is the bridge between the power supply equipment and the electrical equipment, which plays the role of transmitting electrical energy. Because of its wide range of applications, faults often occur. The following briefly analyzes the causes of the common problems of YJV high-voltage cables. Classification according to the causes of faults can be roughly classified into the following categories: