1.Electric Power Research Institute， China Southern Power Grid Company Limited， Guangzhou 510663， China;2.School of Electric Power Engineering, South China University of Technology， Guangzhou 510640， China

High impedance grounding faults occur frequently in distribution network with arc suppression coil grounding. There are some problems in existing fault detection and location methods, such as low accuracy and difficulty in implementation. Parallel resonance process is analyzed when high impedance grounding fault occurs in distribution network with arc suppression coil grounding， and the distribution characteristics and the phase differences of the declining periodic component of zero sequence current at the upstream and downstream of the fault points are also investigated. A fault section location method for a high impedance grounding fault based on the declining periodic component of zero sequence current is proposed in this paper. The main station in distribution automation collects the phases of declining periodic component of zero sequence current calculated by the fault location units of each fault section in the feeder, then the phases and estimated transition resistance are used to select the fault section. The proposed fault location method is verified by RTDS simulation, and the results show that the proposed method is accurate and feasible.