NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Tester Manufacturer
Question: What are the main causes of power cable faults? Answers: The most direct cause of cable faults is the breakdown of insulation reduction. There are many factors that lead to insulation reduction. Cable faults can be roughly divided into three comparisons: grounding, short circuit, and disconnection Big plate question: What are the main reasons for power cable faults? Answers: The most direct cause of cable faults is the breakdown of insulation reduction. There are many factors that lead to insulation reduction. Cable faults can be roughly divided into grounding, short circuit, and disconnection. Three larger plates. According to the actual operation situation, there are probably and only a few situations. First of all, we have to consider the damage of external force. From the analysis in recent years, especially in today's rapid economic development, a considerable number of cable failures are caused by mechanical damage.
For example, improper operation during cable laying can easily cause mechanical damage. The high-level civil construction on the direct buried cable is also easy to cause damage to the running cable. Sometimes, the cable damage is not serious, and it will take several months or even several years for the damaged part to break down and cause a failure. Sometimes the damage is serious, and the cable failure will occur directly at that time, which directly affects the use of the cable. Wuxi cable fault maintenance is because the cable has been placed for a long time and improperly placed, resulting in the cable insulation being damp. This situation is also very common. It usually occurs at the cable joints in direct burial or in the pipe, and the cables at the cable joints. If the insulation is not up to standard, if the joint is made in a humid climate, water or water vapor will be mixed into the joint. After a long time, water branches will be formed under the action of the power plant, which will gradually damage the cable and cause the cable to break down, resulting in a short circuit.
There is also chemical corrosion. The cable is directly buried in an area with acid and alkali effects, which often causes corrosion of the cable armor, lead sheath or outer layer. The protective layer has been chemically corroded for a long time, resulting in the failure of the protective layer and the reduction of insulation. , can also cause cable failure. Long-term overload operation, overload operation, due to the thermal effect of the current, when the load cable passes through the cable, it will definitely cause the cable to heat up, and the skin effect of the charge will be broken down. In the long-term overload operation, the excessively high temperature will aggravate the insulation. The aging of the cable, so that the cable insulation is broken down by the current, especially in the hot summer, the temperature hi of the cable often causes the weak insulation of the cable to be destroyed first, so in summer, there will be many cable failures.
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