What are the common types of faults in power cables?

I. What are the common types of faults in power cables? The method of determining the type of cable fault is to use an insulation resistance meter at one end of the line to measure the insulation resistance of each phase. Generally based on the following to determine the type of fault: (1) when shaking the cable core or several cores of insulation resistance to ground, or core to core insulation resistance is lower than 100 kOhm, for low-resistance grounding or short-circuit fault. (2) When shaking the cable core or several cores of insulation resistance to ground, or between the core and the core insulation resistance is much lower than the normal value, but higher than 100 kilohms, 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 so, that is, broken line fault. (4) When shaking the test cable has a core or several core conductor discontinuity, and by resistance to ground, for the broken wire and ground 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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