How to Use a Cable Fault Tester to Troubleshoot Faults
As we all know, a cable fault tester is used to troubleshoot faults, but how do you use it to troubleshoot? I believe most people are "newbies" and don't know much about this aspect. Below, the editor will explain how a cable fault tester is used to troubleshoot faults.
1. Perform a cable insulation resistance test, conduct a full-length test on the faulty cable, and the waveforms from the first and subsequent tests should be basically consistent.
2. Analyze the insulation resistance data. If the customer's site information for the joint location is unclear, it can only be used as a reference for subsequent tests.
3. Determine the fault point range and pinpoint the fault. Use the high-voltage flashover method for testing: After the pulse method test is completed, use the flashover method. Based on the fault insulation condition, first test with phase A which has lower insulation resistance, using a 2 microfarad 20KV capacitor, an impulse voltage of 15KV. The high-voltage flashover method test waveform shows the secondary breakdown discharge waveform of the fault point. Then, based on the flashover method test waveform, although this fault point is difficult to break down and discharge, the secondary breakdown waveform can determine the fault distance, which completes the rough measurement. Next is pinpointing the fault point. At this test site, within the rough measurement distance range, it happens to be a coal yard, and the pinpointing test environment is relatively poor. Pinpointing can only be done on the coal pile. Through careful work, the fault point was determined on the rubble pile using an acoustic-magnetic synchronous pinpointing instrument.
4. For the cable's withstand voltage test, use series resonance to perform a withstand voltage test on the repaired cable. The withstand voltage time must not be less than one hour. If smoke, gas emission, burnt odor, or flashover discharge sounds occur within the specified time, it indicates insulation defects. If there are no abnormal phenomena during the voltage rise process, it indicates good withstand voltage performance and the cable can be put into normal use.
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