How does the pulse echo method measure the cable fault distance?
Answer: For low-resistance and open-circuit type faults, using low-voltage pulse reflection method to measure cable faults is simpler and more straightforward than the above bridge method. It only needs to observe the time difference between the fault point reflection and the transmitted pulse to measure the distance. During the test, a low voltage pulse is injected into the cable. When the pulse propagates to the fault point, reflection occurs, and the pulse is reflected back to the measuring point. Using the instrument to record the time difference between the transmitted and reflected pulses, the distance at which the fault occurred can be calculated by knowing the pulse propagation speed. The method is simple and intuitive, and does not need to know the original data such as the cable length, and can also identify the position of the cable joint and the branch point according to the reflected waveform.
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