Because the cable is deeply buried underground and has a large length, it is also troublesome to detect cable faults. Although there is now a cable fault tester to assist, but because of the complex environment of cable laying, there are many things to pay attention to when carrying out detection work. So what should be paid attention to when detecting buried faults?

First of all, it is necessary to list the possible causes of the fault and the basic situation of the cable, such as whether the fault is caused by operation or pre-test, whether it is a new cable or a cable that has been running for a long time, the approximate length of the cable, whether there is a joint in the middle of the cable, whether the cable has failed before, whether the cable is directly buried or laid in the cable trench, and the type of cable, etc.

The tester must pay attention to the safety of operation. Before each connection with the cable, connect each phase line of the cable to the ground with a short line for discharge. When discharging, one end of the short line must be grounded first, and the other end must be connected to each phase line of the cable for discharge.

For other electrical appliances, such as capacitors, test transformers, etc., pay attention to discharge wiring before wiring and removing the connecting wire. In short, we should form operating habits and be not afraid of trouble. Before each operation, we should first pay attention to whether the operating appliances are connected to the circuit, and then discharge before operation.

When testing with high-voltage flashover method, whether the cable fault is high resistance fault or low resistance fault, the high-voltage flashover method can be used for testing. For the low resistance or broken line fault that can directly test the fault distance with low-voltage pulse, it is generally necessary to use high-voltage impulse to verify the test and the precise location of the fault point.

In addition, when the buried detection is carried out, other cables in the same cable trench should be temporarily powered off, the test end and the user end of the tested cable should be guarded by a specially assigned person, and the user end cable should be completely separated from the indoor power supply cable to ensure personal safety and the safety of electrical appliances. Come to our website for more relevant content http://webtest2.daoshangbao.cn Learn more.