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
The operation and use of the cable fault tester The operation method of the cable fault tester The multiple pulse method fault test waveform is very easy to judge and has high accuracy, but to obtain an ideal and easy-to-interpret waveform requires certain skills. 1. According to the operation of the cable fault tester on site, the operation method of the cable fault tester The multiple pulse method fault test waveform is very easy to judge and has high accuracy, but to obtain an ideal and easy-to-interpret waveform, it is necessary to master certain skills. 1. After the circuit is connected according to the multiple pulse method on site, it is normal to apply an impulse high voltage if the ideal test waveform cannot be obtained.
Because the distance of the fault is not known in advance, the electric strength of the fault point is also unclear. If the impulse voltage is not high enough and the fault point is not broken down by the impulse high voltage to generate an arc, the cable fault tester cannot collect the fault echo. At this time, only the terminal open circuit waveform can be seen.
The surge voltage must be increased until the fault echo is seen. 2. Sometimes the fault point is far away from the test end and the echo is weak, so it must be adjusted“length selection”, in order to get a stronger fault echo. Cable fault tester with“short distance”,“middle distance”,“long distance”three states.
“short distance”Suitable for testing faults within 1Km distance,“middle distance”suitable for test 1——Failure within 3Km distance,“long distance”suitable for test 3——Failure within 16Km distance. 3. In order to ensure sufficient breakdown of the fault point and sufficient arc duration, the cable fault tester is recommended to use an energy storage capacitor with a withstand voltage of 2 microfarads above 35KV. 4. During the multiple pulse method test, there is a string between the high-voltage equipment and the faulty cable.“pulse generator”, the impact high voltage actually added to the faulty phase of the cable is lower than the output voltage of the high voltage generator.
If the output voltage of the high voltage generator has reached 35——42KV, the fault point has not yet broken down, the cable fault tester should replace the impulse high voltage flashover current sampling method for testing.
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