Transmission line travelling wave recording method
A transmission line and traveling wave technology, applied in the direction of the fault location, etc., can solve the problems of large amount of data uploaded by traveling wave signals, many false trigger waveforms, and undetectable traveling wave signals, etc., and achieve simple monitoring methods, high identification accuracy, The effect of reducing the number of waveform false triggers
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[0012] According to the sudden change of the power frequency current at the fault time, the method uses the fault component method to find out the accurate fault time, and extracts the waveform triggered and uploaded at the fault time in a short time. The principle is as follows:
[0013] The power frequency waveform is the 50Hz sinusoidal current waveform transmitted on the line that we currently use. When dealing with power frequency waveforms, we usually adopt the following basic assumptions:
[0014] (1) The power frequency waveform after filtering is an ideal smooth sinusoidal waveform.
[0015] (2) The frequency of the normal power frequency waveform will not change, which is 50Hz in China.
[0016] (3) The power frequency current will not change drastically when the line is running.
[0017] figure 1 It shows a waveform diagram of a faulty power frequency. The power frequency current suddenly rises at the time of the fault, and the current suddenly decreases at the t...
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