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–POE Tester
How does the cable fault tester manufacturer use the cable fault tester to determine its response range? With the development of society and the continuous progress of instruments, there will be some faults in the use of the instrument. However, some disadvantages are invisible and unpredictable to the naked eye. Therefore, the corresponding fault detector will appear in front of everyone and become a good helper for the family.
The use of cables is not new to you, so you may not be very aware of cable faults. Only professional personnel or relatively extensive experience can accurately determine the root cause of an error, and the emergence of cable fault detectors can help you alleviate this problem. If you have a sufficient understanding of this product and your industry, you can use the experience to introduce the wraparound detection method of the cable fault detector below.
Surrounding test: If the reception is normal, according to the principle of black near red far, there should be a stable response around the ground rod, and the arrow should keep forward. Determine the response range: Start at the near end of the pipe, away from the transmitter, with the red end of the A box facing forward, and gradually move away from the transmitter to test. As the distance increases, the signal gradually decreases and the gain increases accordingly.
The amplitude and phase of the signal will gradually become unstable and eventually indistinguishable. When the signal can be resolved correctly, record the position and receiver gain. The distance from this location to the ground rod is the maximum one-way response range for this fault.
Considering the environmental factors of pipeline laying (such as laying ultra-high voltage cables in the cable trench, but only testing outside the trench), the response range at the fault point is generally smaller than that at the grounding node. Therefore, it is recommended to take 1/3~1/2 of the measured response range as the test interval. For example, when the measured response range is 20 meters, the recommended test interval is 6-10 meters, when used as the interval for obstacle detection and testing, it can avoid excessive distance and leakage of fault points, and can also speed up the test .
In the test, it is recommended to use the recorded gain value when determining the response range, not to miss too small signal, to avoid unnecessary noise response caused by too large gain. Confirmation tests cannot be performed if the substation grounding grid is used as the transmitter ground. The recommended general test distance is 3~5m, which can meet most requirements without affecting the efficiency.
If the fault resistance is too high, shorten the test distance appropriately. How to determine the response range of a cable fault tester? Cable fault tester manufacturer Shenzhen Noyafa Electronic Technology Co., Ltd.
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