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1. The installation did not strictly follow the process of cable construction and the problems that were not considered in the process regulations. After the acceptance, DC voltage withstand test resulted in the formation of a back-EMF in the joint resulting in insulation failure.
2, due to poor sealing caused. The middle joint must adopt the sealed structure of metal copper shell plus PE or PVC insulation coating to ensure the solidity of the seal during construction on site, which effectively ensures the sealing and waterproof performance of the joint.
3, high-voltage cable on-site construction conditions are poor, cables and connectors in the factory manufacturing environment and process requirements are high, and the construction site temperature, humidity, dust are not well controlled.
4, the cable material itself and the inevitable defects in the cable manufacturing, laying, terminal production process, etc., by the operation of the electric heat, chemical, environmental and other factors, the cable insulation will be different degrees of aging, and this kind of aging This can cause cable faults to occur.
5. During the 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 of the joint, the insulation is exposed to the air and the insulation is also inhaled. Moisture, these all leave hidden dangers for long-term safe operation.
What are the causes of the failure of the high voltage cable?
High-voltage cables play a very important role in power transmission. However, some failures may occur for a long time. The following is a summary of the causes of the common failures of high-voltage cables.