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Power cable line fault causes and countermeasures <br> <br> external damage: may suffer external damage in the custody of the cable laying and transportation process, running in particular has been running the buried cable in the ground other construction projects in 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.
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, this section of 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 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.
In the daily operation of the power system, due to many factors such as the quality of the power cable, improper construction, and unreasonable operation and maintenance, the normal operation of the cable is affected. The common line faults are short-circuit faults, ground faults, and fault linearity. malfunction.