1, the site conditions are relatively poor, cables and joints in the factory manufacturing environment and process requirements are high, and the construction site temperature, humidity, dust are not well controlled.
2. The installation did not strictly follow the process construction or process regulations without considering possible problems. Completion acceptance using DC withstand voltage test results in the formation of a back electric field in the joint resulting in insulation failure.
3, 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.
4. During the construction of the cable, it is inevitable that small scratches will be left on the insulating surface. The semi-conductive particles and the sand on the abrasive cloth may also be embedded in the insulation. In addition, the insulation is exposed to the insulation during the construction of the joint. Moisture, these all leave hidden dangers for long-term safe operation.
5, 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 occur in varying degrees of aging, and this kind of aging This can cause cable faults to occur.
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