Method for online detection of high impedance grounding fault of distributing line
A technology for high-resistance ground faults and high-resistance faults, which is applied in the directions of fault location, spectral analysis/Fourier analysis, etc., can solve problems such as difficult use of distribution lines, complex surrounding environment, and high-resistance ground faults, and achieve Reliable data support, high technical reliability, and the effect of reliable guiding opinions
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[0024] A specific implementation of a method for online detection of high-resistance ground faults in distribution lines is:
[0025] 1) Determine the characteristic harmonic frequency of the fault according to the line topology.
[0026] 2) On-line monitoring of the zero sequence voltage of the secondary side feeder of the transformer, to obtain a sampling value f(n) of a cycle, n=1, 2······N, N is an integer, and the value is 120~240 .
[0027] 3) Through the FFT analysis of the sampled value sequence, the analysis frequency spectrum is obtained with the power frequency voltage as the fundamental wave.
[0028] 4) Verify whether frequency f occurred N : The characteristic harmonic amplitude of 1000~5000Hz reaches the peak mutation characteristic of 5%~7% of the fundamental amplitude. If it meets the criteria for high-resistance grounding fault, it is regarded as high-resistance grounding fault.
[0029] 5) Estimate the fault resistance value based on the characteristic harmoni...
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