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What factors will reduce the insulation of Sichuan control cable? Look at it

Release time:2021-05-13 Author:admin

Zhongtian cable has been engaged in the production and sales of various cable products such as Sichuan control cable for many years, and has rich industry experience. I would like to share with you several factors affecting cable insulation, hoping to be useful to you!

1. External force destruction

From the operation analysis in recent years, especially in today's rapid economic development, a considerable part of cable faults are caused by mechanical damage.

2. Damp insulation

This situation is also very common, usually occurs in directly buried or exhaust pipe in the cable joint. For example, the unqualified joint of control cable and the joint made in humid climate will make the joint damp or mixed with water vapor, and form water branch under the action of long-term electric field, which will gradually damage the insulation strength of the cable and cause failure.

Sichuan control cable

3. Chemical corrosion

When the cable is directly buried in the area with acid-base effect, the armor, lead skin or outer protective layer of the cable is often corroded. The protective layer is subject to chemical corrosion or electrolytic corrosion for a long time, resulting in the failure of the protective layer, the reduction of insulation and the failure of the cable.

4. Long term overload operation

Overload operation, due to the thermal effect of the current, when the load current through the cable, will inevitably lead to conductor heating. At the same time, the skin effect of charge, eddy current loss and dielectric loss of steel armor will also produce additional heat, which will increase the temperature of the cable. During long-term overload operation, high temperature will accelerate insulation aging, even insulation breakdown. Especially in the hot summer, the temperature rise of the cable often leads to the breakdown of the weak insulation of the cable, so there are many cable faults in summer.

Sichuan control cable manufacturer

5. Cable joint failure

The cable joint is the weak link in the cable line, and the cable joint failure often occurs due to the direct error of personnel (poor construction). In the process of making cable joints, if there are some original nets, such as loose crimping of joints, insufficient heating and so on, the insulation of cable head will be reduced, which will lead to accidents.

6. Environment and temperature

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

7. Other factors

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

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