Common faults and analysis:
1. Damage to external forces From the operational analysis of recent years, especially in the high-speed economic development of Haipu East, a considerable number of cable faults are caused by mechanical damage. For example, when the cable is laid and installed, the construction is not standardized and it is easy to cause mechanical damage. It is also easy to damage the running cable by carrying out the civil construction work on the buried cable. l Sometimes, if the damage is not serious, it will take months or even years to cause complete breakdown of the damaged part to form a fault, and sometimes severe damage may lead to a short-circuit fault, directly affecting the safe production of electricity-using units.
2. Insulation is also very common. It usually occurs at the junction of the cable that is buried directly or in a row. For example, if the cable joints are not qualified and joints are made under humid weather conditions, the joints will be filled with water or mixed with water vapor. For a long time, the water branches will form under the action of the electric field, which will gradually damage the insulation strength of the cables and cause failures.
3. Chemically etched cables are buried directly in areas where acid and alkali are present. This can often lead to corrosion of the cable sheathing, lead sheath or outer sheath. The protective layer is subject to long-term chemical or electrolytic corrosion, resulting in failure of the protective layer and reduced insulation. , can also lead to cable failures. The corrosion of the unit cable is quite serious.
4. Long-term overload operation Overload operation, due to the thermal effect of the current, the load current will inevitably lead to conductor heating when passing through the cable. At the same time, the skin effect of the charge and the eddy current loss and insulation loss of the steel crucible will also generate additional heat. The temperature of the cable rises. During long-term overload operation, an excessively high temperature will accelerate the aging of the insulation so that the insulation is broken down. Especially in the hot summer season, the temperature rise of the cable often leads to the first breakdown of the weak cable insulation. Therefore, in the summer, the cable fault is particularly high.
5 Cable connector fault The cable connector is the weakest link in the cable line. The fault of the cable connector caused by personnel's direct fault (bad construction) occurs frequently. In the process of making cable joints, if the joints of the joints are not tightly connected and the heating is insufficient, the insulation may be reduced, which may cause accidents.
6. Environment and temperature The outside environment and heat source of the cable can also cause the cable to be overheated, insulation breakdown, and even explosion.
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