cable news: causes of cable failure-非凡电子娱乐

the most direct cause of cable failure is that the insulation is reduced and breakdown.

sensitive insulation reduces the number of elements,

according to the actual operating experience, summed up nothing more than the following situations.

1: external damage.

based on the analysis of operation in recent years,

especially in the rapid economic development of shanghai, pudong,

quite a lot of cable failures are caused by mechanical damage.

for example: cable installation is not standardized construction,

easy to cause mechanical damage;

in the construction of buried cable on the civil construction is also very easy to run cable damage, etc..

sometimes if the injury is not serious,

it will take months or even years to lead to complete breakdown of the damage site,

sometimes severe short-circuit failure may occur,

the direct effects of electric j and the use of safe production "double power units.

2: insulation damp.

this is also very common,

usually occurs in the buried or drain the cable connector.

for example: cable joint failure and in wet weather conditions do joint,

will make the joint into the water or mixed with water vapor, r for a long time under the action of electric field to form water branches,

damage to the insulation of the cable.

3: chemical corrosion.

the cable is buried directly in the area with acid and alkali,

it often results in the corrosion of the cables, the lead sheath or the outer protective layer,

the protective layer is subjected to chemical or electrolytic corrosion for a long time,

resulting in the failure of the protective layer, insulation reduction,

can also cause cable failure.

the corrosion of the cable is very serious

4: long-term overload operation.

overload operation due to the thermal effect of current,

when the load current passes through the cable, it will lead to the conductor heating,

the skin effect and the eddy current loss of steel armor,

dielectric loss will also produce additional heat,

so that the cable temperature. long term overload operation,

too high temperature will accelerate the aging of insulation,

insulation breakdown. especially in the hot summer,

the temperature rise of cable often leads to the breakdown of cable insulation,

therefore, in the summer, the cable fault is particularly.

5: cable joint failure.

cable joint is the weakest link in cable line,

the cable joint failure caused by the direct fault of the personnel (bad construction) often occurs.

in the process of making cable joint,

if there is no pressure tight joints, inadequate heating, such as the original network,

will lead to lower insulation cable head, causing accidents.

6: environment and temperature.

the external environment and the heat source of the cable will cause the cable temperature too high,

insulation breakdown, and even explosion fire.

7: normal aging or natural disasters and other reasons