Power cable line fault cause external damage: may suffer external damage during storage cable, transportation, laying and operation, in particular the buried cables running on the ground in the construction of other projects vulnerable to damage. Such accidents often account for 50% of cable accidents. In order to avoid such accidents, in addition to enhancing the quality of work in all aspects of cable storage, transportation, and laying, it is more important to strictly implement the groundless system.
Outdoor terminal head soaking: due to poor construction, insulation glue is not filled, causing the terminal head to soak, and eventually explode. Therefore, it is necessary to strictly implement the construction process regulations and seriously accept and inspect; strengthen inspection and timely maintenance. The terminal head leaks oil, destroys the sealing structure, causes the draining of the impregnant at the end of the cable to dry, increases the thermal resistance, accelerates the aging of the insulation, easily absorbs moisture, and causes thermal breakdown. When it is found that the terminal head is leaking oil, inspections should be intensified, and when it is serious, the power should be cut off and redone.
Protective layer corrosion: Electrochemical corrosion of underground stray currents or chemical corrosion of non-neutral soils invalidates the protective layer and loses its protective effect on insulation. The solution is to install drainage equipment in areas with stray electric current concentration; when the local soil on the cable line contains chemical substances that damage the cable lead package, the cable should be installed in the pipe, and use neutral soil as the cable pad And cover, but also coated with asphalt on the cable.
Over-voltage and overload operation: Improper selection of cable voltage , sudden high pressure surge in operation, or long-term overload may damage the cable insulation and break the cable. This needs to be stepped up by stepping up inspections and improving operating conditions.
Outdoor terminal head soaking: due to poor construction, insulation glue is not filled, causing the terminal head to soak, and eventually explode. Therefore, it is necessary to strictly implement the construction process regulations and seriously accept and inspect; strengthen inspection and timely maintenance. The terminal head leaks oil, destroys the sealing structure, causes the draining of the impregnant at the end of the cable to dry, increases the thermal resistance, accelerates the aging of the insulation, easily absorbs moisture, and causes thermal breakdown. When it is found that the terminal head is leaking oil, inspections should be intensified, and when it is serious, the power should be cut off and redone.
Protective layer corrosion: Electrochemical corrosion of underground stray currents or chemical corrosion of non-neutral soils invalidates the protective layer and loses its protective effect on insulation. The solution is to install drainage equipment in areas with stray electric current concentration; when the local soil on the cable line contains chemical substances that damage the cable lead package, the cable should be installed in the pipe, and use neutral soil as the cable pad And cover, but also coated with asphalt on the cable.
Over-voltage and overload operation: Improper selection of cable voltage , sudden high pressure surge in operation, or long-term overload may damage the cable insulation and break the cable. This needs to be stepped up by stepping up inspections and improving operating conditions.
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