Do you know the causes and hazards of aging of wires and cables?

What are the reasons for the aging of wires and cables? Can cable aging still be used? Is there any harm or harm? The following is the reason analysis and disadvantages of the aging of wire and cable arranged by Huaxing wire and cable. I hope it can help you!


Causes and hazards of aging of wires and cables
1) ACSR Cable aging reason: external force damage. According to the operation analysis in recent years, especially in haipudong, a large number of cable failures are caused by mechanical damage. For example: cable laying and installation of non-standard construction, easy to cause mechanical damage; It is very easy to damage the cables in operation by carrying out civil construction on directly buried cables. Sometimes, if the damage is not serious, it will take several months or even years to lead to the complete breakdown of the damaged part and form a fault. Sometimes, if the damage is serious, the short-circuit fault may occur, which directly affects the safety production of the power plant and the user.
2) Reason for cable aging: damp insulation. This kind of situation is also very common, generally occurs in the directly buried or row of pipe in the cable joint. For example, if the cable joint is not made up to standard or is made in humid climate, the joint will be filled with water or mixed with water vapor. For a long 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.
Cable overhead cable
3) Cause of cable aging: chemical corrosion. When the cable is directly buried in the acid-base area, the armor, lead skin or outer protective layer of the cable will be corroded. Due to long-term chemical or electrolytic corrosion of the protective layer, the protective layer will fail, the insulation will be reduced, and the cable fault will also be caused. Unit: the cable corrosion is quite serious.
4) Cable aging reason: long term overload operation. Overload operation, due to the thermal effect of the current, the load current through the cable will inevitably lead to conductor heating, at the same time, the skin effect of charge, eddy current loss of steel armor and dielectric loss will also produce additional heat, which will increase the temperature of the cable. During long-term overload operation, too high temperature will accelerate the aging of the insulation, resulting in the breakdown of the insulation. Especially in the hot summer, the temperature rise of the cable often leads to the first breakdown of the weak part of the cable insulation, so in summer, there are many cable faults.
5) Cable aging reason: cable joint failure. The cable joint is the weakest link in the cable line, and the cable joint failure caused by the direct negligence of personnel (poor construction) often occurs. In the process of making cable joints, if there are some original nets such as loose crimping and insufficient heating, the insulation of cable head will be reduced, which will lead to accidents.


6) Causes of cable aging: environment and temperature. The external environment and heat source of the cable will also cause the cable temperature too high, insulation breakdown, even explosion and fire.
The main reasons for cable aging are listed as follows:
1. Long term overload operation. Overload operation, due to the thermal effect of the current, the load current through the cable will inevitably lead to conductor heating, at the same time, the skin effect of charge, eddy current loss of steel armor and dielectric loss will also produce additional heat, which will increase the temperature of the cable.
2. Environment and temperature. The external environment and heat source of the cable will also cause the cable temperature too high, insulation breakdown, even explosion and fire.
3. External force damage. From the operation analysis in recent years, a considerable number of cable failures are caused by mechanical damage.
4. Damp insulation. It usually occurs at the cable joint directly buried or arranged in the pipe. After a long time, the water branch is formed under the action of electric field, which gradually damages the insulation strength of the cable and causes the fault.
5. Cable joint failure. The cable joint is the weakest link in the cable line, and the cable joint failure caused by the direct negligence of personnel (poor construction) often occurs.
6. Chemical corrosion. When the cable is directly buried in the acid-base area, the armor, lead skin or outer protective layer of the cable will be corroded. Due to long-term chemical or electrolytic corrosion of the protective layer, the protective layer will fail, the insulation will be reduced, and the cable fault will also be caused. Recommended product: overhead cable
Will aging wires increase power consumption


Aging wires will increase power consumption. After aging wires, if the outer insulation sheath is damaged, it will not only increase wire consumption and power consumption, but also cause circuit fire. It needs to be replaced in time.
The aging of wires will be accelerated when the temperature is too high, and the outer insulation skin will be ignited when the temperature is too high. In real life, there are many people who do not know the common sense of the circuit. When connecting two wires, they just use steel wire pliers to screw two or three turns and do not tighten them, which leads to the small contact surface of two wires at the joint. According to the knowledge of physics, the smaller the cross-sectional area of the conductor, the greater the resistance, and the calorific value Q = I square RT. the larger the resistance, the greater the calorific value.