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
High-voltage impulse flashover method of cable fault tester The high-voltage impulse flashover method of cable fault tester can test high-resistance leakage faults, high-resistance flashover faults, low-resistance short-circuit faults and disconnection faults of cables. The high-voltage shock flashover method of the cable fault tester with wide adaptability The high-voltage shock flashover method of the cable fault tester can test the high-resistance leakage fault, high-resistance flashover fault, low-resistance short-circuit fault and disconnection of the cable. Fault is an efficient, reliable and widely adaptable cable fault detection method. The high-voltage shock flashover method is to apply a shock high voltage at the beginning of the faulty cable to break down the fault point with an arc. Use the voltage sudden jump at the moment of fault breakdown as the test signal.
Ranging is performed by observing the time that this signal travels once between the fault point and the beginning of the cable. The current sampling method is often used to take test signals. The current sampling method uses the principle of electromagnetic induction, and uses the current transformer to pick up the current signal on the grounding wire to obtain the reflected signal of the electric wave current in the cable.
There is no electrical relationship with the high-voltage generator and mains, so it is particularly safe. The waveform obtained by the current sampling method has a clear characteristic inflection point of the reflected waveform, which is especially beneficial to the analysis and location of fault distance. However, the test waveform of the current sampling method is more complicated; the waveforms obtained by different types, different lengths, different fault distances, and different impulse high voltages are ever-changing, and are often far from the standard waveforms.
Misjudgment and misjudgment often occur due to the inability to grasp the waveform law.
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