In view of such problems of traditional residual current protection device as low sensitivity and wide monitoringblindareaatTN-C-Swiringmodeoflow-voltagedistributionsystem

akindofleakagecurrentfault monitoring method based on Hausdorff distance is proposed. Based on the low-voltage distribution automation system

the leakage current monitoring is achieved by the intelligent distributed agent mode using the edge calculation. By analyzing the difference characteristic of residual current waveform on both sides of residual current in case of the leakage current fault due to single-phase to ground between the transformer outlet and the branch box

the Hausdorff distance algorithm is introduced and its distance value represents the difference degree of residual current between adjacent terminals. The fault section is determined by the unified fault judgment. Its recognition ability is free from downstream normal residual current due to various reasons and themonitoringsensitivityisimproved.Thecorrectnessoftheschemeisverifiedbythesimulationtest.