Pulse reflection waveform comparison measurement method

2022/07/19

Author: Noyafa–CCTV Tester

Question: Pulse reflection waveform comparison measurement method Answer: The actual cable structure may be more complicated, for example, there are branch points, and the pulse reflection waveform is not easy to understand. A single-phase ground fault occurs in a cable with a connector in the middle. First, measure it on a good core. Question: Pulse reflection waveform comparison measurement method Answer: The actual cable structure may be complicated, such as there are branch points, and the pulse reflection waveform is not easy to understand . A single-phase grounding fault occurs in a cable with a connector in the middle. First, a waveform is measured on a good core wire, and then the waveform is measured on the faulty core wire, and the two are compared. There is an obvious difference between the two waveforms at F on the waveform. This is caused by the reflected pulse from the fault point, and the distance represented by this point is the fault point location.

The measured waveform of the faulty conductor is good compared with the measured waveform of the faulty conductor. The waveform comparison method measures the single-phase-to-ground fault. The modern microcomputerized low-voltage pulse reflection method has the function of waveform memory, that is, the waveform is saved in digital form, and at the same time, the latest measurement can be stored. The waveform and the memory waveform are displayed at the same time. Using this feature, the operator can find the fault point by comparing the difference between the pulse reflection waveform of the good core and the faulty core of the cable, avoiding the difficulty of understanding the complex pulse reflection waveform, the fault point is easy to identify, and the sensitivity is high. The possibility of faults in the three phases of the actual power cable is very small. In most cases, there are good cores. The waveform comparison method can be easily used to measure the fault point.

Using the waveform comparison method, the cable length or the correction wave velocity can be accurately determined. Due to the loss of the pulse during the propagation process, after the reflected pulse of the cable terminal returns to the measurement point, the rising edge of the waveform is relatively smooth, and it is difficult to accurately calibrate the arrival time of the reflected pulse, especially when the cable distance is long, this phenomenon is more serious protrude. When the waveforms of the open circuit and the short circuit are displayed at the same time, the bifurcation point of the two is obvious and easy to identify.

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