Jinan cable tray is widely used, and its cable is mainly insulated by a layer of outer sheath. If the cable tray is not well protected and is corroded by external gas for a long time, the insulation performance of the cable tray will gradually decrease, and it will not play an important role at this time. The insulation layer on the surface of the cable is made of plastic and rubber. Sometimes it is found that it is aging. What are the causes? Then for this problem, Zengli will take you to analyze the bridge.
Jinan cable bridge
1. Insulation moisture.
Generally, this kind of situation is also relatively common, which usually occurs at the cable joint directly buried or in the pipe bank. For example, if the cable joint is not made up to standard and is made under humid climate conditions, water will enter the joint or mix with water vapor, which will form water tree under the action of electric field, which will gradually damage the insulation strength of the cable and cause fault.
2. Corrosion of chemical raw materials.
Jinan cable is buried directly in the acid-base area, which often leads to the corrosion of the armor, lead skin or outer protective layer of the cable. Due to the long-term chemical corrosion or electrolytic corrosion of the protective layer, the protective layer fails and the insulation is reduced, which also leads to cable failure.
3. Long term overload operation.
During overload operation, due to the thermal effect of current, the conductor will inevitably be heated when the load current passes through the cable. At the same time, the skin effect of charge, eddy current loss of steel armor and dielectric loss of insulation will also produce additional heat, which will increase the temperature of the cable. During long-term overload operation, high temperature will accelerate the aging of insulation and even the insulation will be broken down. Especially in the hot summer, the temperature rise of the cable often leads to the breakdown of the weak part of the cable insulation, so in summer, there are many cable faults.
4. Cable joint failure.
The cable joint is the weakest link in the cable line. The cable joint fault caused by the direct fault of personnel (poor construction) often occurs. In the process of making cable joints, if there are joints that are not crimped tightly and heated insufficiently, the insulation of cable head will be reduced, which will lead to accidents.
5. Environmental and temperature factors.
Jinan cable bridge and the surrounding environment and heat source of the cable will also cause the cable temperature is too high, insulation breakdown, serious explosion and fire.
6. External force damage.
At present, many cable faults are caused by mechanical damage. For example, if the cable laying and installation are not standardized, it is easy to cause mechanical damage; if civil construction is carried out on directly buried cable, it is easy to damage the cable in operation. In some cases, the damage of the cable is not serious at that time. It may take several months or even several years for the damaged parts to break down completely to form a fault, and some cables with serious damage may have a short circuit fault, which will directly affect the production and living safety of cable bridge and power users.
Jinan cable bridge
I believe that through the above article, we have a certain understanding of some reasons for the aging of cable tray in Jinan. No matter where the cable tray is applied, we should pay attention to its regular maintenance, so as to effectively avoid unnecessary loss caused by equipment failure due to years. The above is the reason why zenglilai bridge takes you to analyze the cable aging.