When the cable fails, to determine the location of the cable fault, it can be divided into three steps:
1. Identify the fault and determine the nature of the fault. Disconnect the cable from the power supply system. Measure the relative insulation resistance with a megohmmeter. If the insulation resistance is zero, measure the fault resistance with a multimeter to determine whether it is a high-impedance fault or a low-impedance fault. Then measure the insulation resistance between phases to determine whether there is a phase-to-phase short circuit. After an accurate cable fault property determination conclusion is reached, the appropriate test methods and instruments can be selected.
2. The cable fault pre-location is tested from one end of the cable, giving the distance from the test end to the fault point, that is, the length of the buried cable from the test end to the fault point.
3. Cable fault fine Because the length of the buried cable is measured on the ground, there will be errors, plus the range error of the pulse reflectometer (TDR or radar), so the fault point needs to be refined.
1. Identify the fault and determine the nature of the fault. Disconnect the cable from the power supply system. Measure the relative insulation resistance with a megohmmeter. If the insulation resistance is zero, measure the fault resistance with a multimeter to determine whether it is a high-impedance fault or a low-impedance fault. Then measure the insulation resistance between phases to determine whether there is a phase-to-phase short circuit. After an accurate cable fault property determination conclusion is reached, the appropriate test methods and instruments can be selected.
2. The cable fault pre-location is tested from one end of the cable, giving the distance from the test end to the fault point, that is, the length of the buried cable from the test end to the fault point.
3. Cable fault fine Because the length of the buried cable is measured on the ground, there will be errors, plus the range error of the pulse reflectometer (TDR or radar), so the fault point needs to be refined.
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