A Location Method of the Single-Phase Grounding Fault Section for the Resonant Grounding System Based on Synchrosqueezing S-Transform
As the fault characteristics in the single-phase resonant grounding system are weak,it is rather difficult to locate the fault section in this system.In the paper,first of all,according to the feature of a large difference of the low frequency energy between of the sound and fault sections,the synchrosqueezing s-transform is used to squeeze and recombine the low-frequency zero-sequence current to enhance the identification degree of the fault feature.Second,the energy ratio in each section is calculated with the section exhibiting the highest energy ratio being identified as the fault location.A fault section localization method based on the synchrosqueezing S-transform is thus proposed.Furthermore,the kurtosis factor of the zero-sequence current full-band recombined signal is utilized to build the protection initiation criterion.Finally,extensive PSCAD simulations under various fault conditions have been conducted to substantiate the proposed method's feasibility and efficacy.Field data further confirm the effectiveness of this novel approach.
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