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: How does power cable fault detection work? Answer: Power cable fault detection is one of the main problems that have plagued the normal power supply of power supply parts for many years. The main problem is that buried cables are buried deep underground, which is invisible and intangible. ? Answer: The fault detection of power cables is one of the main problems that have plagued the normal power supply of the power supply department for many years. The main problem is that the buried cables are buried deep underground, which is invisible and intangible. It is more difficult to find a cable fault. It often takes days or ten years. In a few days, it will cause unpredictable power outages, especially in township areas. Due to the influence of the ground, it is not practical to find cable faults by large-scale excavation. Cable faults are divided into three categories: grounding, short circuit, and disconnection. The types of faults mainly include the following aspects: one-core or two-core grounding of three-core cables. Short circuit between two-phase cores, complete short-circuit of three-phase cores, disconnection of one-phase core or multi-phase disconnection, direct short-circuit or disconnection faults can be directly measured with a multimeter. For indirect short-circuits and grounding faults, use mega The ohmmeter shakes the insulation resistance to ground, and determines the fault type according to its resistance value.
The composition of cable faults 2.1 Construction damage The occurrence of buried cable faults is about 80% caused by civil construction damage, of which only 20% can directly constitute the maintenance action of the power transmission maintenance device, and the fault point can be found intuitively, while 80% 100% of the faults will not cause maintenance actions, and the time will be as short as a few days, as long as a few months, or even 1 to 2 years. Poor manufacturing process of the central cable head This kind of fault accounts for about 10% of the cable fault. Now the cable head connection is mostly made of heat-shrinkable materials, and the baking is uneven or over-baking, resulting in poor thermal shrinkage or thermal melting of the insulating material. Excessive, and then reduce the degree of self-insulation, cable overload or off-phase cable overload and off-phase heating, causing the insulation strength of the cable insulation material to decrease, which is also a cause of cable failure.
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