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–Noyafa Cable Tester
How to use the cable fault distance meter What are the cable fault test steps? The detection of cable faults generally goes through four steps: diagnosis, distance measurement, path detection and fixed point. 1. Diagnosis The diagnosis of the nature of the cable fault, that is, to determine the type and severity of the fault. How to use the cable fault distance finder? The detection of cable faults generally goes through four steps: diagnosis, distance measurement, path finding and fixed point. 1. Diagnose the nature of cable faults, that is, to determine the type and severity of the fault, so that the tester can prescribe the right medicine and choose the appropriate cable fault location and fixed-point method.
Use a megohmmeter and a multimeter to measure the fault resistance to determine whether the cable fault is high resistance or low resistance; whether it is a flashover or a closed fault; whether it is grounding, short circuit, disconnection, or a combination of them; whether it is single-phase, two-phase, or three-phase. Phase failure. 2. Ranging Cable fault locating, also known as rough measurement, uses an instrument at one end of the cable to determine the fault distance. The commonly used fault locating methods in the field include the classical bridge method and the modern traveling wave method. Use a cable fault distance finder or a cable fault distance finder.
3. Pathfinding Cable Path Identifier or Cable Path Identifier. 4. Acoustic-magnetic synchronization legal point of fault fixed point: use the cable fault fixed point instrument to synchronize with the electromagnetic signal of the discharge, digitally sample the sound signal, and display the sound waveform at the moment of discharge on the LCD screen. The waveform can be maintained continuously for operation. Distinguish carefully to avoid the shortcoming of the sound being fleeting, and the actual discharge waveform is obviously different from the surrounding noise. More importantly, the sound waveforms of multiple discharges are very similar. When the sound waveforms of multiple discharges are observed to be the same , it can be clearly judged that the discharge sound has been collected. Since the response range of the acoustic measurement method is generally small, when the discharge sound is heard, it is very close to the fault point, generally not more than 5m, or even within 1-2m.
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