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• Power System Monitoring System Solution

Before using low voltage cable fault finder determined the point of failure of the cable, cable testers must understand the structure and cable insulation materials, insulation and failure to determine the nature of cable lines, according to the different nature of the fault in order to select the appropriate measurement method , quickly and accurately measured distance to fault. Otherwise, when the actual test will encounter many unexpected problems, bringing difficulties to the actual testing.

    First, with megger or multimeter to measure the cable at one end of each relative phase between various insulation resistance, and if the measured insulation resistance is higher, should be continuity test conductor at one end of the cable that the cable the three-phase short-circuit conductor and grounded at the other end of the repeated measurements to determine the conductor is blown.

    According to the test results, the general nature of the fault can be divided into the following categories:

    1. Low resistance fault or short circuit fault

    A number of core or core cable insulation resistance or insulation resistance between the core and the core is less than 200W. Usually, they are single-phase, the two-phase and three-phase short-circuit and short circuit to ground and grounding, such failures measured by low-pressure pulse method.

    2. Disconnection fault

   There are a number of cable core or core conductor is not continuous, sometimes accompanied by resistance grounding phenomenon. Such failures can be used to test low-voltage pulse method.

    3. Flashover failure

    A number of core or core cable insulation resistance or insulation resistance between the core and the core is relatively high, but the cables DC pressurized to a certain value, a sudden breakdown. Such failures occur mostly during the preventive trials, the failure to measure the pulse current mode of direct flash method.

    4. High resistance fault

    Insulation resistance between a number of core or core cable insulation resistance or the core and the core is lower than normal but higher than 200W, this situation is not very high fault resistance, not on the DC voltage is applied to the use of pulsed current mode of operation measuring the impact of flashover.