The invention dislcoses a single-phase earth fault line
selection method based on
transient state high-frequency component
correlation analysis. The method comprises the steps that whether or not a single-phase earth fault happens is judged according to the magnitude of a
busbar zero-mode
voltage instantaneous value, db10 wavelets are adopted for performing five-layer
wavelet packet decompositionon zero-mode current of two work
frequency periods after each
feeder line fault, after the minimum
frequency band is removed, node
wavelet packet deposition coeffiences are reconstructed and summeredto obtain a fault transient high-frequency
capacitance-current component, and a correlation coeefient matrix M between every two feeder lines is obtained; Si is set as a correlation accumulation coefficient for the ith
feeder line fault transient high-freuqency
capacitance-current component, when rho ij is larger than rho set, Si is equal to 1, 1 is subtracted from Si, and a correlation accumulation
coefficient matrix S can be obtained; if Si is larger than 0 constantly, the
busbar breaks down; if Si of only one
feeder line is smaller than 0, the circuit is a fault circuit; if Si is smaller than 0 constantly, the circuit with the maximum high-frequency-band
wavelet packet energy sum is determined as the fault circuit. According to RTDS
simulation experimental
verification, the method has the good accuracy, adaptability and the like.