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Analysis of the Causes of Three Major Cable Failures in Tiankang High Voltage Electric Power
 　　
　　 Tiankang high voltage cable is a bridge between the power supply equipment and the electrical equipment, which plays a role in transmitting electrical energy. Because of its wide range of applications, faults often occur. The following brief analysis of the causes of the common problems of high-voltage and high-voltage cables can be divided into the following categories according to the causes of faults: manufacturer's manufacturing reasons, construction quality reasons, and design unit design reasons. class.
　　 First, manufacturers create reasons
According to the different parts of the manufacturing site, the manufacturer's manufacturing causes are divided into high-voltage cable, high-voltage cable joints, and high-voltage cable grounding systems.
1ã€High-voltage cable body manufacturing reasons
Generally, high-voltage cables are prone to problems such as eccentricity of insulation, uneven thickness of insulation shields, impurities in insulation, protrusions inside and outside shielding, uneven degree of cross-linking, high-voltage cable moisture, and poor sealing of high-voltage cable metal sheaths. In some cases, serious failures may occur during or shortly after the completion of the project, and most of them are in the form of defects in the high-voltage cable system, causing serious risks to the long-term safe operation of the high-voltage cable.
2, high voltage cable connector manufacturing reasons
High-voltage and high-voltage cable joints have previously used wrap-around type, die-cast type, and molded type, and require a large amount of work to be performed in the field, and due to the limitation of on-site conditions and the manufacturing process, there is inevitable unavoidable gas between insulating layers. Gap and impurities are prone to problems. The types commonly used in China are assembly and prefabrication.
Tiankang high-voltage cable connectors are divided into high-voltage cable terminal connectors and high-voltage cable connectors. No matter what the connector type, high-voltage cable connector faults generally appear in the high-voltage cable insulation shield fracture, because this is where the electrical stress concentration, due to manufacturing reasons Causes of failure of high-voltage cable joints include stress cone body manufacturing defects, insulation fillers, and leakage of the seal ring.
3, high voltage cable grounding system
High-voltage cable grounding systems include high-voltage cable grounding boxes, high-voltage cable grounding protection boxes (with protective cover protectors), high-voltage cables cross-interconnected boxes, and cover protection devices. 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 the protective layer protector is easily damaged.
　　 Second, the construction quality reasons
There are many cases of high-voltage and high-voltage cable system failure due to construction quality. The main reasons are as follows: First, the site conditions are relatively poor, high-voltage cables and connectors are manufactured in the factory with high environmental and process requirements, and the construction site temperature and humidity , dust is not well controlled. The second is that in the process of construction of high-voltage cables, 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 will also Inhaling water, these all leave hidden dangers for long-term safe operation. Third, the installation did not strictly follow the process of construction or process regulations did not take into account the possible problems. The fourth is that the DC voltage withstand test results in the formation of a back-EMF in the joint resulting in insulation failure. The fifth is due to poor sealing. 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.
　　 Third, the design reason
The breakdown of the high-voltage cable due to thermal expansion of the high-voltage cable causes breakdown. When the cross-linked high-voltage cable is loaded with high temperature, the temperature of the core increases, and the high-voltage cable expands by heat. The high-voltage cable at the turning point in the tunnel is on the surface of the bracket. Long-term high-load operation of the high-voltage cable has a large amount of peristaltic force, resulting in crushing of the bracket elevation. High-voltage cable outer sheath and metal sheath penetrated into the high-voltage cable insulation layer, causing breakdown of the high-voltage cable.