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 Length Tester
At present, power cables, as the main transmission equipment for power transmission, will experience various failures during long-term use or under the influence of external factors. In addition, the cables are long and buried in the ground, making maintenance cumbersome. Therefore, power repair personnel will use At present, power cables are the main transmission equipment for power transmission. During long-term use or affected by external factors, various failures will occur.
In addition, the cables are long and buried in the ground, making maintenance cumbersome. Therefore, power repair personnel will use power failure detection equipment to detect the cause of cable failure and locate the fault point. Next, the editor will introduce the conventional cable fault detection equipment including the cable identification instrument.
Cable fault distance meter The cable fault distance meter is mainly used to measure the fault nature of the cable fault, the total length and the approximate position of the cable fault point from the test end. Its working principle is to inject a low-voltage pulse signal into the faulty cable, and the pulse signal propagates along the cable to the impedance mismatch point, such as: fault point, intermediate joint, short-circuit point, etc. The low-voltage pulse generates a reflected signal, which is recorded by the cable fault tester host. The location of the faulty cable is to realize the accurate location of the fault point through the potential difference between the two points. Cable routing instrument Similar to the cable identification instrument, the main function of the cable routing instrument is to determine the path method of laying buried cables.
Its basic working principle is: the transmitter generates electric and magnetic waves and transmits the transmitted signal to the underground metal pipeline to be detected through different transmission connection methods. After the underground metal pipeline senses electromagnetic waves, an induced current is generated on the surface of the underground metal pipeline, and the induction The current will travel far along the metal pipeline, and during the propagation of the current, electromagnetic waves will be radiated to the ground through the underground metal pipeline, so that when the underground pipeline detector receiver detects on the ground, it will The ground directly above the pipeline receives the electromagnetic wave signal, and the position and direction of the underground metal pipeline can be judged by the change of the strength of the received signal. High-voltage signal generator The main function of the high-voltage signal generator is to break down the fault point of the cable instantaneously through high current. This device is widely used in the high resistance of the cable. Its working principle is to use DC power to apply DC pulse high voltage to the cable to make the fault tap through and discharge, and determine the location of the fault point by waveform analysis method, acoustic measurement method or acousto-magnetic synchronization method.
Cable fault locator The cable fault locator is to determine the precise position of the cable fault point on the basis of the cable fault tester host determining the approximate position of the cable fault point. Test for high-resistance flashover faults of cables, high- and low-resistance grounding, short circuits and cable disconnection, poor contact and other faults. Its working principle is to judge the precise location of the cable fault point by transmitting the strength of the radio wave signal to the faulty cable to the cable fault tester.
I believe that after reading the above introduction of the editor, you should have some understanding of the conventional cable fault detection equipment including the cable identification instrument.
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