What are the common causes of high voltage cable accidents?

Once a fire occurs in the cable, the fire is fierce and spreads rapidly. A large amount of harmful gases will occur when burning, causing difficulty in fighting. After the cable burns out, the repair time is long and the loss is serious. Therefore, great attention must be paid to preventing cable fire accidents. So what are the causes of high voltage cable accidents? The following is a brief analysis. 1, the site conditions are relatively poor, cables and joints in the factory manufacturing environment and process requirements are very high, and the construction site temperature, humidity, dust are not good control. 2, the installation did not strictly follow the process construction or process regulations did not take into account the possible problems. DC withstand voltage test is adopted for completion acceptance, resulting in the formation of anti-electric field in the joint, resulting in insulation damage. 3, due to poor sealing treatment. The middle joint must adopt the sealing structure of metal copper shell plus PE or PVC insulation anticorrosive coating to ensure the compaction of the lead seal during on-site construction, thus effectively ensuring the sealing and waterproof performance of the joint. 4. In the process of cable construction, fine slip marks will inevitably be left on the insulation surface, and semi-conductive particles and sand particles on the emery cloth may also be embedded in the insulation, in addition, during the construction of the joint, due to the exposure of the insulation to the air, the insulation will also absorb moisture, which will leave hidden dangers for long-term safe operation. 5. The cable material itself and the inevitable defects in the process of cable manufacturing, laying and terminal manufacturing are affected by factors such as electric heating, chemistry and environment in operation, the insulation of the cable will have different degrees of aging, and this kind of aging will eventually lead to the occurrence of cable failure.