The cables of cable tray in Jinan are mainly insulated by the outer sheath. If the protection is not good and the cables are corroded by the external gas for a long time, the insulation performance will gradually decline, and the cables will slowly age and become hard, brittle or fall off. At this time, the insulation will not work. 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 cause the conductor to heat up. At the same time, the skin effect of the charge, as well as the eddy current loss and insulation medium loss of the steel armor, will also generate additional heat, thereby increasing the temperature of the cable. 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 source around the cable tray and the cable will also cause the cable temperature to be too high, insulation breakdown, and serious explosion and fire.
This is the reason why the appearance of cable tray cables is aging. I hope I can help you. More information can be found on our website http://0512lc.com consulting service