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Causes of Cable Failure

Views: 175     Author: Site Editor     Publish Time: 2020-11-10      Origin: Site

In real life, once the overhead power distribution cable fails, it cannot provide electricity, so people's work and production will be affected. Therefore, after the failure, it is necessary to solve it as soon as possible. In fact, there are many reasons that will lead to the appearance of cable failures. The cable fault indicator will show where the fault is and only by carefully analyzing the reasons and performing reasonable inspections can the cause of the failure be found and solved by the correct method.


The most direct cause of overhead electric line failure is breakdown due to reduced insulation. There are many factors that cause the insulation to be reduced. According to actual operating experience, it can be summarized in the following situations.

overhead electric line



External force damage.

Judging from the operation analysis in recent years, quite a lot of wire and cable failures are caused by mechanical damage. For example, non-standard construction during overhead distribution line laying and installation can easily cause mechanical damage; civil construction on directly buried cables can also easily damage cables in operation.



The insulation is damp.

This situation is also very common, and generally occurs at the cable joints in direct burial or piping. For example, unqualified cable joints and joints made in humid weather conditions will cause water or steam to enter the joints. Over time, water branches will form under the action of the electric field, which will gradually damage the insulation strength of the cable and cause electrical short circuit failure.



Chemical corrosion.

The cable is directly buried in the area with acid and alkali effect, which will often cause the cable armor, lead skin or outer protective layer to be corroded. The protective layer suffers from chemical corrosion or electrolytic corrosion for a long time, which causes the protective layer to fail and reduce the insulation. The cable is faulty. The short circuit and overloading may happen.



Long-term overload operation.

During long-term overload operation, excessively high temperature will accelerate the aging of the insulation, and even breakdown of the insulation. Especially in the hot summer, the temperature rise of the wire and cable often leads to the breakdown of the weak insulation of the cable. In this case, the fault current indicator will work.



The cable connector is faulty.

The cable joint is the weakest link in the cable line, and the cable joint failure caused by the direct fault of the personnel (poor construction) often occurs. In the process of making cable joints, if there are original nets such as insufficient joint crimping, insufficient heating, etc., the insulation of the cable head will be reduced, which will cause an accident.

This is why you need a reliable cable fault indicator when testing cable joints.

overhead distribution line


Environment and temperature.

The external environment and heat source where the cable is located can also cause the cable's temperature to be too high, insulation breakdown, and even explosion and fire.



Other reasons such as normal aging of the cable body or natural disasters


To find and solve the faults of cables, you need an accurate electric wire fault indicator. The automated cable fault indicator monitoring system will help a lot for the wellness of cables.

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