A High-Precision Cable Fault Location Method Based on Characteristic Parameter Adjustment of Wave Velocity
A technology of characteristic parameters and positioning method, which is applied in the direction of fault location, fault detection according to conductor type, measurement of electricity, etc., can solve problems such as wave velocity fixed error, achieve high-precision positioning, reliable signal strength, and meet the calculation requirements.
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Embodiment 1
[0057] Such as figure 1 As shown, a cable fault high-precision positioning method based on characteristic parameters to adjust the wave velocity, the cable to be tested is provided with a monitoring interval that meets the preset transmission distance; the cable fault high-precision positioning method includes:
[0058] Step S1, generating test pulses multiple times and inputting them into the monitoring interval of the cable to be tested, and collecting test waveform data of all test traveling waves passing through the monitoring interval.
[0059] Specifically, the methods of generating traveling wave signals outside the cable monitoring section include faults outside the section, line closing action, external injection, etc. Sensor monitoring records. For example, use a Rogowski coil traveling wave current sensor installed at both ends of the cable monitoring section, and record faults outside the section, line closing action traveling waves through actual measurement, or ...
Embodiment 2
[0085] The cable fault high-precision positioning method based on the first embodiment above is a specific embodiment of the method.
[0086] When a traveling wave propagates in a cable, traveling wave dispersion and attenuation naturally occur, resulting in a decrease in intensity and a slowing of the rising edge. As the propagation distance increases, the traveling wave continues to attenuate and widen, and the wave speed becomes lower. Lost to undetectable after a kilometer. The waveform changes in the process of traveling wave transmission are as follows: Figure 5 shown.
[0087] In the wave speed preparation stage, pulses are artificially injected into the cable from outside the detection interval through the discharge equipment, or the fluctuations or faults outside the interval after initial installation are collected in series into the traveling wave, and the formed traveling wave is transmitted in the cable and detected by the detection sensors at both ends. Pulse ...
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