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 Monitor Tester
What are the faults of the cable fault tester and how to judge the faults of the cable fault tester First, the type of cable fault Power cable faults are mainly due to mechanical damage, insulation aging, low construction quality, overvoltage and so on. 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. Second, the method of judging the fault of the cable. Judging the cause of the cable fault 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 measuring 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. Judgement of the cause of the cable fault 3. The cable fault tester finds out the method of the cable fault: 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. Determine the cause of cable fault Shenzhen Noyafa Electronic Technology Co., Ltd. is a high-tech enterprise engaged in scientific research, production and sales, and provides technical services for cable fault detection.
At present, a variety of high-voltage test equipment and testing instruments have been widely used in the industry. At the same time, our company provides technical services such as cable fault detection and substation testing and testing to users across the country. The core engineer responsible for providing technical services has 20 years of on-site testing. Experience, can provide solutions according to different types of cables and site environment. What are the faults of the cable fault tester and how to judge the causes of the cable faults? Shenzhen Noyafa Electronic Technology Co., Ltd.
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