Power cable is an important one in the cable industry. Power cables often have various faults. What are the common faults of power cables?

1. Mechanical damage

Cable failures caused by mechanical damage account for a large proportion of cable accidents. Some of the mechanical damage was minor did cause a malfunction at the time. Damage can take months even years to develop into failure. The main causes of mechanical damage to cables are:Guangxi cable manufacturer

(1) Damaged during installation. The cable was accidentally bumped during installation; the cable was damaged by excessive mechanical traction; the cable was damaged by excessive bending.

(2) Directly damaged by external force. After installation, carry out civil construction on near the optical cable path, so that the optical cable is directly damaged by external force.Guangxi wire cable

(3) The vibration shock load of the driving vehicle can also cause the lead (aluminum) package of the underground cable to crack.

(4) Damage caused by natural phenomena. For example, the inner insulating rubber of the intermediate joint terminal head expands cracks the outer casing cable sheath; the cable sheath installed on the nozzle bracket is scratched; the intermediate joint conductor is broken due to excessive tension caused by ground subsidence.

2. Insulation damp

After the insulation is damp, it will cause the cable withstand voltage to drop cause failure. The main reasons why cables get wet are:

(1) Water ingress caused by unsealed structure improper installation of junction box junction box.

(2) Guangxi cables are poorly manufactured, the metal sheath has small holes cracks.

(3) The metal sheath is pierced corroded by foreign objects.

3. Insulation deterioration

Aging insulation can lead to a drop in the withstand voltage of the cable, which can lead to failure. The main reasons for cable aging are:

(1) The slag air gap inside the cable medium is freely hydrolyzed under the action of the electric field.

(2) The cable is overloaded the cable communication is poor, causing local overheating.

(3) The oil-impregnated paper insulated cable loses its insulation.

(4) Overtime use of power cables.

4. Overvoltage

Overvoltage can cause electrical breakdown of defective cable insulation lead to cable failure. The main reasons are: atmospheric overvoltage (such as lightning strike); internal overvoltage (such as operating overvoltage).

5. Poor design production process

Poor design manufacturing process at the head middle of the cable can also lead to cable failure. The main reasons are: improper design of electric field distribution; improper selection of materials; poor craftsmanship failure to manufacture according to regulationsGuangxi cable

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