Views: 14 Author: Site Editor Publish Time: 2022-07-15 Origin: Site
What are the general causes of cable aging? The most direct cause of cable aging failure is the breakdown of insulation reduction. There are many factors for the reduction of conductive insulation, and according to the actual operating experience, it is summarized in the following cases.
How to determine the aging of the wire?1, whether current leakage or even short-circuit fire; 2, hardening and cracking of the insulation skin; 3, increased contact resistance and heating of the joint.
The main causes of cable aging are listed as follows.
Long-term overload operation. Overload operation, due to the thermal effect of the current, the load current through the cable is bound to lead to conductor heating, while the charge skin effect and the eddy current loss of the steel armor, insulation medium loss will also produce additional heat, so that the cable temperature rises.
The external environment and heat sources that the cable is exposed to can also cause high cable temperatures, insulation breakdown, and even explosive fires.
From the analysis of the operation in recent years, a considerable number of cable failures are caused by mechanical damage.
Generally occurs at the cable joints in the direct burial or row of pipes. Time in the electric field under the action of the formation of water dendrites, gradually damage the cable insulation strength and cause failure.
Cable joints are the weakest link in the cable line, and cable joint failures caused by direct personnel negligence (poor construction) often occur.
The cable is directly buried in the area with acid and alkali effect, which often causes the cable armor, lead skin or outer sheath to be corroded, and the protective layer suffers chemical corrosion or electrolytic corrosion for a long time, resulting in the failure of the protective layer and the reduction of insulation, which also leads to cable failure.
Wire aging will increase power consumption, line aging, if the outer insulation sheath is broken not only increase line consumption, increase electricity consumption, but also cause circuit fire. It needs to be replaced in time.
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