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: Judgment of fault breakdown or not. Answer: Gradually increase the DC voltage applied to the cable. When the voltage exceeds the breakdown voltage of the fault gap, the fault will breakdown and discharge. Fault click through, in addition to the measuring instrument is triggered to display the waveform, it can also pass the question: judgment of fault click through or not When the breakdown voltage occurs, the fault taps through and discharges. In addition to the fact that the measuring instrument is triggered to display the waveform, it can also be judged by the following phenomena: (1) The voltage suddenly drops (the pointer of the voltmeter swings to the zero point of the scale); (2) The DC leakage current suddenly increases (the microammeter The pointer swings up suddenly); (3) The overcurrent relay operates; (4) The ground wire connected to the test equipment appears“tempered”, hear“pop, pop”sound.
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