Research on double frequency signal single-phase grounding fault location technology based on low excitation impedance transformer grounding device

To solve the distribution network of single-phase earth fault online positioning difficult problem. This paper puts forward a kind of grounding device of double frequency signal single-phase earth fault location online technology based on low excitation impedance transformer. With low excitation impedance transformer grounding device for single-phase earth fault protection, at the same time by low inject two-frequency signal excitation impedance transformer, through to the dual frequency signal detection to realize single-phase earth fault of in situ. Based on the analysis of the simulation model, validation of the correctness of the proposed technical solution, the technology used for single-phase earth fault in situ rapid isolation distribution network provides a kind of means