The cables of Jinan cable tray mainly rely on an outer layer of sheath insulation. If the protection is not good, they will be corroded by external gases for a long time, and the insulation performance will gradually decrease. They will gradually age and become hard, brittle or fall off, and at this time, they will not be able to function as insulation. The insulation layer on the surface of the cable is often made of plastic and rubber, and sometimes it is found that it has aged. What are the reasons for this situation?
1. Damping of insulation.
This situation is also relatively common, usually occurring at cable joints directly buried or in ducts. For example, unqualified cable joints and joints made in humid weather conditions can cause water or steam to enter the joints, forming water branches under the action of an electric field, gradually damaging the insulation strength of the cable and causing faults.
2. Corrosion of chemical raw materials.
Directly burying cables in areas with acid-base effects often leads to corrosion of the cable's armor, lead skin, or outer protective layer. The protective layer may become ineffective due to long-term chemical or electrolytic corrosion, resulting in reduced insulation and cable failure.
3. Long term overload operation.
Overload operation, due to the thermal effect of the current, when the load current passes through the cable, it will inevitably lead to conductor heating. At the same time, the Skin effect of the charge, the eddy current loss of the steel armor, and the insulation medium loss will also produce additional heat, which will increase the cable temperature. During long-term overload operation, excessively high temperatures can accelerate insulation aging, leading to insulation breakdown. Especially in hot summer, the temperature rise of cables often leads to the first breakdown of weak insulation areas, so there are particularly many cable faults in summer.
4. Cable connector failure.
Cable joints are relatively weak links in cable routes, and cable joint failures often occur due to personnel's direct negligence (poor construction). During the production of cable joints by construction personnel, if there are loose crimping or insufficient heating of the joints in the original network, it will lead to a decrease in the insulation of the cable head, leading to accidents.
5. Environmental and temperature factors.
The external environment and heat sources around cable trays and cables can also cause excessive cable temperature, insulation breakdown, and serious explosions and fires.
That's all for explaining the reasons for the aging of the cable appearance of the cable tray. I hope it can be helpful to you. For more information, please come to our website http://sfcyhotel.com consulting service