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–CCTV Tester
Question: What are the common faults and identification methods of cable fault tester? Answer: Types of cable faults Power cable faults are mainly due to mechanical damage, aging insulation, low construction quality, and overvoltage. The commonly used cables are cross-linked B. Question: What are the common faults and discrimination methods of the cable fault tester? Answer: Types of cable faults Power cable faults are mainly due to mechanical damage, aging insulation, low construction quality, and overvoltage. The commonly used cables are cross-linked vinyl, non-drip type, oil-impregnated paper type, polyvinyl chloride and unknown types. According to the nature of cable faults, they can be divided into low-resistance grounding or short-circuit faults, high-resistance grounding or short-circuit faults, and disconnection faults. , disconnection and ground faults and flashover faults.
What are the common faults and discrimination methods of the cable fault tester 2. The discrimination method of cable faults First of all, we need a megohmmeter to measure the insulation resistance value of each phase, and judge the fault type according to different insulation resistance values. 1. When we measure the cable-to-ground insulation resistance value below 100KΩ2. When we measure the cable-to-ground insulation resistance deviation from the normal value or higher than 100KΩWhen the high voltage cable is faulty. 3. When the resistance value of the measurement cable to ground is high or normal, conduct multiple tests on the conductor to check whether there is a disconnection. If there is, it is a disconnection fault.
4. When the conductors of each core or multiple cores of the measurement cable are discontinuous, and after multiple core-to-ground measurements, determine which types of the three faults mentioned above are. 5. The flashover failure basically occurs in the preventive withstand voltage test, the terminal of the cable and the joint in the middle. Sometimes flashovers occur multiple times, but at intervals of a few seconds or minutes.
Third, the cable fault tester to find out the cable fault method: 1. With high pressure equipment, there are traditional impact high pressure flashover method and low pressure pulse method. 2. Any high-resistance fault presents simple waveform characteristics similar to low-voltage pulse short-circuit faults, which are very easy to interpret. 3. The cable fault tester finds the fault point through four main parts: the cable fault ranging host, the locator, the path meter, and the high-voltage signal generator.
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