Technology of One-phase-to-earth Trouble Section Location Based on Prony Decomposition and Multi-constituents Fusion

Prony method is used to fit multi-constituent data through a series of linear combinations to obtain the amplitude, phase, damping factor and frequency of each constituent. Prony decomposition is used to decompose the temporary constituents of null sequence current to multi terminal trouble in dispersion network. The DC constituent and high-frequency constituent of trouble null sequence are effectively extracted and fused. The cutting position is obtained with comparing the phase relationship to the orientation information of the fused constituent. Theoretical analysis and results show that the algorithm is applicable to all kinds of ground connection errors, can accurately and reliably determine the one-phase ground connection error pause of dispersion network, and effectively improves the positioning accuracy and efficiency.