What are the methods of determining power cable faults?

I. What are the methods of determining power cable faults? Generally speaking power cables mainly have disconnection faults, grounding or short circuit faults, disconnection and grounding faults and flashover faults and so on. You can determine the type of power cable fault according to some of the following methods. Here you need to use the insulation resistance meter, put the insulation resistance meter on the line of a at one end of the line to measure the insulation resistance of each phase. (1) When shaking the cable there is a core or several core conductor discontinuity, and by the resistance to ground, can be judged as a broken line and ground fault. (2) When shaking the cable a core or several core insulation resistance to ground, or core and core insulation resistance is much lower than the normal value, but higher than 100 kOhm, for high-resistance grounding fault. (3) When shaking the cable core or several core insulation resistance to ground is high or normal, the conductor continuity test should be carried out to check whether there is a broken line, if there is that is a broken line fault. (4) When shaking the cable core or several cores of insulation resistance to ground, or core and core insulation resistance is lower than 100 kOhm, for low-resistance grounding or short-circuit fault. (5) flashover faults occur in the preventive voltage test, most of the parts in the cable terminal and intermediate joints. Flashover sometimes occurs several times in a row, each interval of a few seconds to a few minutes.

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