Double-sampling rate distribution network line fault point positioning method based on traveling wave method
A double sampling rate, line fault technology, applied in the direction of the fault location, etc., can solve the problems of high sampling rate, small fault traveling wave amplitude, and not widely used, so as to reduce the sampling time window, increase the trigger speed, The effect of reducing the amount of calculation
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[0034] Step S1, according to the phase current data measured by the low sampling rate measuring equipment, to image 3 For example, take the power frequency cycle P=0.02s, the time interval Q=0.005s, and calculate the correlation degree K between the corresponding first phase current waveform I1 and the second phase current waveform I2 from t=0;
[0035] Step S2, determine the size of the correlation degree K and the set threshold 0.99. If K>0.99, it is judged that the fault does not occur, return to step S1, and set t=t+0.005(s); if K≤0.99, record the fault occurrence period T: (t+0.02) to (t+0.025), for The waveform of the high-sampling-rate measuring device during the T period is recorded and stored.
[0036] Step S3, process the phase current waveform collected by the high-sampling-rate measurement device that starts the wave recording, to Figure 4 As an example, the arrival time T of the initial traveling wave at nodes 1 to 6 is obtained 1 ~T 6 with traveling wave po...
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