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Jinda Cable Manufacturer: Reasons for Decrease of Cable Insulation


  Zinda CableProducts are widely used, a wide variety of cable insulation reduction is a more important issue. The following small series will introduce the reasons for the reduction of cable insulation.

1. Other factors

Other reasons such as normal aging or natural disasters of the cable body.

2. External force damage

In today's rapid economic development, a considerable number of cable failures are caused by mechanical damage.

3. Insulation is damp

Generally, it occurs at the cable joint directly buried or in the exhaust pipe. For example, if the cable joint is not qualified and the joint is made under humid climatic conditions, the joint will enter water or be mixed with water vapor. Over time, water branches will be formed under the action of electric field, which will gradually damage the insulation strength of the cable and cause failure.

4. Chemical corrosion

  CableDirectly buried in the area of acid and alkali action, often cause the cable armor, lead or outer protective layer is corroded. Protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in the failure of the protective layer, insulation reduction, can also lead to cable failure.

5. Long-term overload operation

Overload operation, due to the thermal effect of current, the load current will inevitably lead to conductor heating when passing through the cable. At the same time, the skin effect of charge, the eddy current loss of steel armor and the loss of insulation medium will also generate additional heat, thus causing the cable temperature to rise. During long-term overload operation, excessive temperature will accelerate the aging of insulation and lead to insulation breakdown, especially in hot summer, the temperature rise of the cable often causes the weak insulation of the cable to be broken down first, so in the summer, the cable failure is particularly many.

6. Cable joint failure

Cable joints are the weakest link in cable lines. Cable joint failures caused by direct negligence (poor construction) of personnel often occur. During the process of making cable joints, if there are reasons such as tight joint crimping and insufficient heating, the insulation of cable heads will be reduced, thus causing accidents.

7. Environment and temperature

The external environment and heat source of the cable will also cause the cable temperature to be too high, insulation breakdown, or explosion and fire.

 

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