Author: Noyafa–CCTV Tester
Question: Predetermined point for cable-to-phase faults Answer: The pre-determined point for cable-to-phase faults is based on the study of signal characteristics, and it is recommended to use the phase-to-phase method for pre-determined points. For the failure of a large part of low-voltage cables, it is often caused by multiple core wires at the same time. Problem: Predetermined point for cable-to-phase faults Answer: Predetermined point for cable-to-phase faults . For the failure of a large part of low-voltage cables, it is often the main insulation failure of multiple core wires at the same time (damage to metal armor or insulation damage to the ground), then there must be insulation damage between the two faulty phases; and for 10kV and For high-voltage cables of the above grades, the possibility of single-core main insulation failure is greater.
Therefore, the phase-to-phase fault predetermined point is more suitable for low-voltage cables. Furthermore, due to various reasons (such as not being able to apply too high voltage, making it difficult to identify the waveform, etc.), it is more difficult to locate faults on low-voltage cables than on high-voltage cables. In the case of low-voltage cables, fast pre-pointing can be performed directly.
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