Jiangsu Shitate Intelligent Power Co., Ltd.
What causes cable aging?
Release time:
2026-01-12
During overload operation, due to the thermal effect of the current, when the load current passes through the cable, it inevitably causes the conductor to heat up. At the same time, the skin effect of charges and the eddy current loss and insulation loss of steel armor will also generate additional heat, causing the cable temperature to rise.
Long term overloaded operation
During overload operation, due to the thermal effect of the current, when the load current passes through the cable, it inevitably causes the conductor to heat up. At the same time, the skin effect of charges and the eddy current loss and insulation loss of steel armor will also generate additional heat, causing the cable temperature to rise.
Environment and temperature
The external environment and heat sources of cables can also cause overheating, insulation breakdown, and even explosions and fires.
external damage
From recent operational analysis, a considerable number of cable failures are caused by mechanical damage.
Insulation becomes damp
Usually occurs at cable joints in direct burial or piping. Over time, water branches will form under the action of an electric field, gradually damaging the insulation strength of the cable and leading to faults.
Cable joint malfunction
Cable joints are the weakest link in cable lines, and cable joint failures often occur due to direct human error (poor construction).
chemical corrosion
Directly burying cables in areas with acid and alkali can often cause corrosion of cable armor, lead sheath, or outer sheath. The protective layer is subjected to chemical or electrolytic corrosion for a long time, resulting in the failure of the protective layer and a decrease in insulation, thereby causing cable aging.
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