What to do if the wire and cable fails

2023-07-13 14:23:45

Because of the failure of each link in the production process of the cable, the installation and installation of the cable, the test of the cable, and the operation of the cable. Regardless of the fault in the cable, the type and nature of the fault are exactly the same. The difference may be the cause of the cable fault. But to find cable faults, to understand the causes of cable faults, but mainly to determine the nature and type of cable faults.

Finding a cable fault means finding the point where the cable fault occurred. It should be noted that most problems or failures in power cables are concentrated at one or more points in the cable. The so-called point is that the plane size is almost zero compared to the cable length. There are also some faults appearing on a certain part of the cable, such as the middle or end of the cable. Generally speaking, the plane size of such faults is relatively large, such as the water in the joint, the creepage of the faulty discharge, etc. Mechanical damage. : Many failures are caused directly due to mechanical damage caused by the laying of cables or mechanical damage caused by operations near the cable path after laying. After the cable has been â€œinjuredâ€ for a certain period of time, its damage will be gradually destroyed and the perforation of the lead in the armored lead will be developed. The intrusion of moisture will lead to complete breakdown of the damaged part and cause failure.

1. Electro-corrosion of power cable sheath: When the power cable is buried under the ground near the environment with strong underground electric field, such as large-scale traffic and electric locomotive tracks, the sheathing of the cable is often lead-packed and corrosive, resulting in moisture intrusion. Insulation damage, failure.

2. Chemical corrosion: Power cables that work in acid-base operations or in gas station environments often cause long-distance corrosion of their armor and lead packages over a large area, causing moisture ingress, insulation damage, and failure.

3. Ground subsidence: When power cables are laid across highways, railways, and tall buildings, the subsidence of the ground often causes the power cables to undergo vertical deformation. As a result, the lead cables of power cables are broken or even broken and they fail.

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1. Loss of power cable insulation: Outdoor cables used for power cables laid in trenches, bumps, or on poles. Due to fluctuations in power cables, high and low gaps, high-level power cable insulation flows to low levels The insulation performance of the power cable dropped, resulting in failure.

2. Long-term overload operation: Due to overload operation, the temperature of the power cable will increase. Especially in the hot summer, the temperature rise of the power cable causes the power cable to be punctured at the weak point of the power cable and the connector is first broken down.

3. Vibration damage: The power cable running under the railway track, due to severe vibration, causes the outer skin of the power cable to be elastically fatigued and rupture to form a fault.

With the increasingly widespread application of power cables in urban power grids, the longer the running time, the more frequent the failures will be, resulting in a variety of reasons for the failure of the cable, mechanical damage, poor design and manufacturing processes, and failure to produce according to regulations. It is often an important cause of cable faults. Chemical, electric corrosion. Electrical corrosion of lead outside the cable causes moisture intrusion and insulation damage. The manufacturing defect of the cable. Due to the long-term overloaded operation of the cable, the temperature of the cable will increase. Especially in the hot summer months, the temperature rise of the cable often leads to the first breakdown of the cable weakness and the butt joint.

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